CN108240965B - Asphalt pavement interlayer bonding strength detection device and detection method thereof - Google Patents
Asphalt pavement interlayer bonding strength detection device and detection method thereof Download PDFInfo
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- G—PHYSICS
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a device for detecting the interlayer bonding strength of an asphalt pavement, and belongs to the field of detection of the technical conditions of highway engineering. The device mainly comprises a pedestal, an air pressure loading device, a horizontal reaction frame, a test piece supporting table, a fixing frame, a first test mold and the like. The air pressure loading device and the test piece supporting table are fixed on the pedestal, the air pressure loading device is provided with a force transmission column and an air pressure loading pressure head, and the air pressure loading device is transversely connected with the horizontal reaction frame. The tested piece is fixed on the test piece supporting table through the first test die and the fixing frame. The air pressure loading device applies axial load to the tested test piece, and the shearing pressure plate applies tangential load to the tested test piece. The method can better simulate the damage form of the asphalt pavement under the action of vehicle load shearing, and has the advantages of high automation degree, small manual error and the like. The invention also discloses a detection method suitable for the device, which is suitable for carrying out detection evaluation on the bonding strength between the road surfaces in the engineering of newly-built road surfaces or old road reconstruction and the like.
Description
Technical Field
The invention belongs to the field of detection of the technical state of highway engineering, and particularly relates to a device and a method for detecting the interlayer bonding strength of an asphalt pavement.
Background
The design method of the asphalt pavement structure in China is established on the basis of the theory of an elastic layered system, namely, the bonding between the pavement structure layers is assumed to be completely continuous. However, the interlayer bonding surface of the pavement structure is not in a completely continuous state in a theoretical model due to the influence of construction and environmental factors. The interlayer bonding surface is a weak link of the pavement structure, and the poor interlayer bonding strength can cause the poor integrity of the pavement structure, further cause the early diseases of the asphalt pavement and greatly reduce the durability of the pavement. At present, along with the increase of road construction mileage and the overall improvement of construction level, the treatment of the interlayer bonding surface of the road surface is more and more emphasized, but no clear quantitative evaluation index and standard of interlayer bonding strength are provided by relevant specifications at home and abroad.
The asphalt pavement is classified according to whether the asphalt pavement is damaged or not by a detection method, the detection means of the technical state of the pavement can be divided into nondestructive detection and destructive detection, the nondestructive detection is mainly carried out aiming at indexes such as pavement damage, flatness, rutting, skid resistance, structural strength and the like, and the destructive detection generally comprises modes such as pavement core drilling, cutting, excavation and the like. The core drilling is a lossy detection sampling means which is most widely applied, relatively fast to operate and small in pavement damage degree at present. According to the pavement core sample, the indexes of the asphalt pavement such as gradation, the asphalt-stone ratio, the asphalt aging degree and the like can be tested. Compared with the indexes, the evaluation of the interlayer bonding strength of the pavement structure is also stopped at a qualitative stage, and only the interlayer continuity or the interlayer separation is distinguished. How to scientifically and quantitatively evaluate the interlayer bonding state of the asphalt pavement is a big problem worthy of deep research in the industry.
The factors influencing the interlayer bonding conditions of the asphalt pavement are numerous and different in law. Generally, the internal causes and the external causes can be summarized, wherein the internal causes mainly comprise interlayer treatment measures, construction processes, interlayer pollution and self conditions of the road (including longitudinal slopes, superelevation and turning radii); the external factors mainly include overload, vehicle speed, air temperature, rainfall, etc.
Currently, since a uniform and standard interlayer bonding strength test method is not formed in the industry, in order to facilitate the development of tests, the bonding strength of a test material is mainly evaluated indirectly, for example, two trabecular test pieces with standard sizes (length 250mm, width 30mm and height 35mm) are bonded into a whole in parallel along the length direction, or two trabecular test pieces are cut into half and then bonded into a whole in series at the end part, and the bending tensile strength and the ultimate strain of a composite beam body are tested to evaluate the bonding strength of the material. The principle of the test is to empirically evaluate the bonding strength of the materials according to the rule of the influence of the bonding strength of different materials on the overall bearing capacity of the composite test piece. The indirect evaluation method usually adopts existing laboratory equipment, usually does not need to additionally design a test mould, but has obvious defects, namely the stress state and the failure mechanism of the interlayer joint surface of the actual pavement are difficult to simulate, and the test evaluation on the bonding strength of the actual pavement core sample drilled by the pavement is difficult to develop. Therefore, developing a set of equipment and a test method special for carrying out detection on the bonding strength of each structural layer of the asphalt pavement has important practical application value.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a device for detecting the interlayer bonding strength of the asphalt pavement, which can better simulate the damage form of the asphalt pavement under the action of vehicle load shearing and is suitable for carrying out quantitative detection and evaluation on the interlayer bonding strength of the pavement in the engineering of newly-built pavements or old road reconstruction and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a device for detecting interlayer bonding strength of an asphalt pavement, which comprises a pedestal, wherein an air pressure loading device and a test piece supporting table are arranged at two ends of the pedestal, a horizontal reaction frame is arranged on the air pressure loading device, the horizontal reaction frame comprises two horizontal upright posts fixed on the side surface of the air pressure loading device, a cross beam fixed at one common end of the two horizontal upright posts, and a circular base fixed on one side of the cross beam close to the air pressure loading device, the circular base is positioned between the two horizontal upright posts, the cross beam and the circular base are both positioned at one side of the test piece supporting table far away from the air pressure loading device, a force transfer column is also arranged on the air pressure loading device, the force transfer column and the two horizontal upright posts are positioned at the same height and are positioned between the two horizontal upright posts, the length of the force transmission column is smaller than that of the horizontal upright column, the end part of the force transmission column is connected with an air pressure loading pressure head, and the air pressure loading pressure head is positioned between the air pressure loading device and the test piece supporting table; the test fixture comprises a horizontal stand column and a fixing frame, wherein a first test mold is arranged between the air pressure loading pressure head and the circular base, the bottom of the first test mold is fixed to the top of a test piece supporting table, the fixing frame comprises two vertical fixing rods arranged on two sides of the first test mold respectively, and two pressing rods fixed to the top ends of the vertical fixing rods, the pressing rods support against the top of the first test mold, and a shearing pressing plate connected with a universal testing machine is arranged between the first test mold and the air pressure loading pressure head.
In a preferred embodiment of the present invention, the first test mold has a length of 3.5cm to 3.8cm,
in a preferred embodiment of the present invention, the first test mold comprises two upper and lower press molds with the same structure, a horizontal cylindrical cavity is formed between the upper and lower press molds, two sides of the upper and lower press molds are provided with protrusions, the protrusions are provided with threaded holes, and the upper press mold is connected with the lower press mold through bolts.
In a preferred embodiment of the present invention, the lower end of the shearing pressure plate is provided with an arc-shaped notch.
In a preferred embodiment of the present invention, the shear platen has a thickness of 1 cm.
In a preferred embodiment of the invention, a circular gasket is arranged on one side of the air pressure loading pressure head away from the force transmission column, and the circular gasket is made of synthetic rubber.
The invention also provides a detection method for the detection device for the interlayer bonding strength of the asphalt pavement, provides two indexes of shear fracture energy and repeated shear dissipation energy, and can scientifically and comprehensively reflect the ultimate shear resistance and the fatigue shear failure resistance of the pavement, so that the interlayer bonding strength of a pavement structure core sample can be accurately and quantitatively evaluated. The method comprises the following steps:
(1) coring on the road surface: selecting an asphalt pavement interlayer bonding condition detection point, and drilling a pavement core sample to obtain a detected test piece; wherein, for testing the bonding strength between the asphalt surface course and the semi-rigid base course, the drill core depth needs to comprise a base course, wherein the pavement structure layer can be divided into an asphalt layer, a base course and a cushion course from top to bottom, and common base course materials comprise cement stabilized macadam, lime macadam and the like; for testing the bonding strength of each sub-layer in the asphalt layer, the drill core depth only needs to comprise the asphalt layer;
(2) preparation of the test: checking the integrity of the tested piece and the flatness of the surfaces of the two ends of the tested piece, and if the flatness of the surfaces of the two ends of the tested piece cannot meet the testing requirement, cutting to obtain the tested piece with a flat surface; before testing, a tested piece and the first test mold are placed in a constant temperature box for heat preservation for more than 4 hours, and the test temperature is 20 ℃ or 60 ℃ so as to reflect the interlayer bonding condition of the pavement under normal environment or high temperature condition in summer;
(3) mounting and prepressing: fixing a tested piece in the first test die, fixing the first test die on the test piece supporting table by the fixing frame, starting the air pressure loading device to pre-press and load the tested piece, adjusting the air pressure loading device to enable the air pressure loading pressure head to apply axial pressure to the tested piece, adjusting the horizontal air pressure load to 70KPa, and performing a single loading shear failure test or a repeated shear fatigue test according to requirements;
(4) single load shear failure test: adjusting the air pressure loading device to enable the air pressure loading pressure head to apply axial pressure to the tested piece, adjusting the horizontal air pressure load to 700KPa, then enabling the lower end of the shearing pressure plate to abut against the upper surface of the tested piece, enabling the shearing pressure plate to uniformly downwards extrude the tested piece at the speed of 1mm/min, recording the deformation displacement of the tested piece loaded by the shearing pressure plate and the load corresponding to the deformation displacement, obtaining a load-deformation curve, and when the load-deformation curve reaches a load peak value FmaxThen gradually decreases to the peak load value FmaxAbout 15% of the total weight of the composition; integrating the area enveloped by the load-deformation curve to obtain the shear fracture energy W of the pavement interlayer bonding;
(5) repeated shear fatigue test: adjusting the air pressure loading device to load the air pressureThe pressure head applies axial pressure to the tested piece, the horizontal air pressure load is adjusted to 700KPa, and the axial pressure is adjusted according to the load peak value FmaxAnd a suitable stress ratio tau/tau0(0.2-0.7) calculating the load level F ═ F of the shear fatigue testmax·(τ/τ0) The loading rate is 10Hz, when the tested piece is subjected to shear fatigue failure, the loading is stopped, the computer records a group of load-deformation data every 0.004 second, and each time of loading, a group of data points form a load-deformation hysteresis curve; calculating the dissipation energy omega of each loading period according to a load-deformation hysteresis curve obtained by a fatigue testiThat is, the area of the envelope of the load-deformation hysteresis curve is obtained by integration, and the dissipation energy omega of each loading in the fatigue life N is converted into the dissipation energy of each loadingiSumming to obtain the fatigue shear dissipation energy of the road surface
The invention has the beneficial effects that:
the invention provides a device for detecting the interlayer bonding strength of an asphalt pavement, which is suitable for the condition that the distance from an interlayer bonding surface of a detected test piece to the end part of the detected test piece is less than the length of a first test mold, and mainly aims at the added layers with the thickness of less than 4cm, such as a thin overlay, an ultra-thin wearing layer and the like in the highway maintenance engineering. The device applies axial pressure to a pavement core sample by adopting a pneumatic loading mode so as to simulate the tire pressure of a pavement surface, and applies shearing force to the bonding surface of a pavement structure layer by a shearing pressing plate on the basis of a universal testing machine platform so as to simulate the shearing and rubbing action of wheel load on the pavement, so that the pavement structure paved with a paving layer is accurately subjected to interlayer bonding strength detection.
The invention also provides another asphalt pavement interlayer bonding strength detection device which comprises a pedestal, wherein an air pressure loading device and a test piece supporting table are arranged on the pedestal, a horizontal reaction frame is arranged on the air pressure loading device, the horizontal reaction frame comprises two horizontal upright columns arranged on the side surface of the air pressure loading device, a cross beam fixed at one common end of the two horizontal upright columns and a circular base fixed at one side of the cross beam close to the air pressure loading device, the circular base is positioned between the two horizontal upright columns, the cross beam and the circular base are both positioned at one side of the test piece supporting table far away from the air pressure loading device, a force transfer column is also arranged on the air pressure loading device, the force transfer column and the two horizontal upright columns are positioned at the same height and are positioned between the two horizontal upright columns, the length of the force transmission column is smaller than that of the horizontal upright column, the end part of the force transmission column is connected with an air pressure loading pressure head, and the air pressure loading pressure head is positioned between the air pressure loading device and the test piece supporting table; the test fixture comprises a circular base, a first test mold, a second test mold, a universal test machine pressure head, a third test mold, a fixing frame and a pressing rod, wherein the circular base is arranged on the horizontal stand columns, the second test mold is arranged between the air pressure loading pressure head and the circular base, the bottom of the third test mold is fixed at the top of the test piece supporting table, the second test mold is arranged between the third test mold and the air pressure loading pressure head, the axis of the second test mold is superposed with the axis of the third test mold, the universal test machine pressure head is arranged above the second test mold, the lower end of the universal test machine pressure head is supported against the top of the second test mold, the fixing frame comprises two vertical fixing rods arranged on two sides of the third test mold respectively and the pressing rod jointly fixed with the top ends of the two vertical fixing rods, and the pressing rod is supported against the top of the third test mold.
In a preferred embodiment of the present invention, the second test mold and the third test mold have the same structure, the second test mold includes two upper molds and two lower molds having the same structure, a horizontal cylindrical cavity is formed between the upper mold and the lower mold, fixing portions are disposed on both sides of the upper mold and the lower mold, threaded holes are disposed on the fixing portions, and the upper mold is connected to the lower mold through bolts.
The invention also provides a detection method for the detection device for the interlayer bonding strength of the asphalt pavement, provides two indexes of shear fracture energy and repeated shear dissipation energy, and can scientifically and comprehensively reflect the ultimate shear resistance and the fatigue shear failure resistance of the pavement, so that the interlayer bonding strength of a pavement structure core sample can be accurately and quantitatively evaluated. The method comprises the following steps:
(1) coring on the road surface: selecting an asphalt pavement interlayer bonding condition detection point, and drilling a pavement core sample to obtain a detected test piece; wherein, for testing the bonding strength between the asphalt layer and the semi-rigid base layer, the core drilling depth needs to comprise the base layer, wherein the pavement structure layer can be divided into the asphalt layer, the base layer and the cushion layer from top to bottom, and the common base layer materials comprise cement stabilized macadam, lime macadam and the like; for testing the bonding strength of each sub-layer in the asphalt layer, the drill core depth only needs to comprise the asphalt layer;
(2) preparation of the test: checking the integrity of the tested piece and the flatness of the surfaces of the two ends of the tested piece, and if the flatness of the surfaces of the two ends of the tested piece does not meet the testing requirement, cutting to obtain a flat tested piece; before testing, the tested piece, the second test mold and the third test mold are placed in a constant temperature box for heat preservation for more than 4 hours, and the test temperature is 20 ℃ or 60 ℃ so as to reflect the inter-layer bonding condition of the pavement under normal environment or high temperature condition in summer;
(3) mounting and prepressing: fixing a tested piece in the first test die and the second test die, enabling an interlayer joint surface of the tested piece to be located between the second test die and the third test die, fixing the third test die on the test piece supporting table through the fixing frame, starting the air pressure loading device to pre-press and load the tested piece, adjusting the air pressure loading device to enable the air pressure loading pressure head to apply axial pressure to the tested piece, adjusting the horizontal air pressure load to 70KPa, and performing a single-loading shearing failure test or a repeated shearing fatigue test according to requirements;
(4) single load shear failure test: adjusting the air pressure loading device to enable the air pressure loading pressure head to apply axial pressure to the tested piece, adjusting the horizontal air pressure load to 700KPa, then enabling the lower end of the universal testing machine pressure head to abut against the side wall of the top of the second test die, uniformly and downwards extruding the tested piece at the speed of 1mm/min, recording the load of the universal testing machine pressure head loaded on the deformation displacement and the corresponding deformation displacement of the tested piece to obtain a load-deformation curve, and when the load is load, obtaining the load-deformation curveThe load-deformation curve reaches the load peak value FmaxThen gradually decreases to a load peak value FmaxEnding the test when the stress is close to 15%, and integrating the area enveloped by the load-deformation curve to obtain the shear fracture energy W of the pavement interlayer bonding;
(5) repeated shear fatigue test: adjusting the air pressure loading device to enable the air pressure loading pressure head to apply axial pressure to the tested piece, adjusting the horizontal air pressure load to 700KPa, and adjusting the horizontal air pressure load to 700KPa according to a load peak value FmaxAnd a suitable stress ratio tau/tau0(0.2-0.7) calculating the load level F ═ F of the shear fatigue testmax·(τ/τ0) The loading rate is 10Hz, when the tested piece is subjected to shear fatigue failure, the loading is stopped, the computer records a group of load-deformation data every 0.004 second, and each time of loading, a group of data points form a load-deformation hysteresis curve; calculating the dissipation energy omega of each loading period according to a load-deformation hysteresis curve obtained by a fatigue testiThat is, the area of the envelope of the load-deformation hysteresis curve is obtained by integration, and the dissipation energy omega of each loading in the fatigue life N is converted into the dissipation energy of each loadingiSumming to obtain the fatigue shear dissipation energy of the road surface
The invention has the beneficial effects that:
the invention also provides another asphalt pavement interlayer bonding strength detection device, which is suitable for the condition that the distance from the interlayer bonding surface of the detected test piece to the two ends of the detected test piece exceeds the length of the first test mold. The device is based on a universal testing machine platform, lateral pressure is applied to a road surface core sample in a pneumatic loading mode to simulate the pressure of a road surface tire, shearing force is applied to a bonding surface of a road surface structure layer through a universal testing machine pressure head to simulate the shearing and rubbing effects of wheel load on a road surface, and accurate detection of bonding strength between an asphalt layer and a semi-rigid base layer is achieved.
Drawings
Fig. 1 is a schematic structural diagram of an asphalt pavement interlayer bonding strength detection device provided in an embodiment of the present invention;
FIG. 2 is the cooperation of the pneumatic loading device with the horizontal upright and the force transmission column of FIG. 1;
FIG. 3 shows the first test mold of FIG. 1 engaged with the test piece holder and the fixing frame;
FIG. 4 is a view of the test piece of FIG. 1 in engagement with a horizontal reaction frame;
FIG. 5 is a view of the shear platen of FIG. 1 engaged with a test piece;
fig. 6 is a schematic structural diagram of an asphalt pavement interlayer bonding strength detection apparatus provided in the second embodiment of the present invention;
FIG. 7 is a load-deflection curve obtained from a single load shear failure test in accordance with one embodiment of the present invention;
FIG. 8 is a load-deflection hysteresis curve obtained by repeating a shear fatigue test according to an embodiment of the present invention;
FIG. 9 is a shear fatigue test load-deformation hysteresis curve obtained in the first embodiment of the present invention.
In the figure:
100. a pedestal; 110. a pneumatic loading device; 111. a force transmission column; 112. a pressure head is loaded by air pressure; 113. a gasket; 120. a test piece supporting table; 130. a horizontal reaction frame; 131. a horizontal upright post; 132. a cross beam; 133. a circular base; 140. a first test mold; 141. pressing the die; 142. pressing a die; 143. a protrusion; 150. a fixed mount; 151. fixing the rod; 152. a pressure lever; 160. shearing the pressing plate; 161. an arc-shaped notch; 170. a universal tester pressure head; 180. second mold testing; 181. an upper die; 182. a lower die; 183. a fixed part; 190. third testing the mold; 200. the test piece is tested.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example one
As shown in fig. 1, an asphalt pavement interlayer bonding strength detection device includes a pedestal 100, an air pressure loading device 110 and a test piece supporting table 120 are disposed at two ends of the pedestal 100, a horizontal reaction frame 130 is disposed on the air pressure loading device 110, as shown in fig. 2 and 3, the horizontal reaction frame 130 includes two horizontal upright columns 131 disposed on the air pressure loading device 110, a cross beam 132 fixed to a common end of the two horizontal upright columns 131, and a circular base 133 fixed to a side of the cross beam 132 close to the air pressure loading device 110, the circular base 133 is located between the two horizontal upright columns 131, the cross beam 132 and the circular base 133 are both located on a side of the test piece supporting table 120 away from the air pressure loading device 110, a force transmission column 111 is further disposed on the air pressure loading device 110, and the force transmission column 111 and the two horizontal upright columns 131 are at the same height, and the length of the force transmission column 111 is smaller than that of the horizontal upright column 131, the end part of the force transmission column 111 is connected with an air pressure loading pressure head 112, the air pressure loading pressure head 112 is located between the air pressure loading device 110 and the test piece supporting table 120, and the air pressure loading device 110 drives the force transmission column 111 to push the air pressure loading pressure head 112 to apply pneumatic load in the horizontal direction to the tested test piece 200.
A first test mold 140 is arranged between the two horizontal columns 131, the first test mold 140 is located between the air pressure loading ram 112 and the circular base 133, and the bottom of the first test mold 140 is fixed to the top of the test piece supporting table 120, as shown in fig. 4, the fixing frame 150 includes two vertical fixing rods 151 respectively arranged at two sides of the first test mold 140 and a pressing rod 152 jointly fixed to the top ends of the two vertical fixing rods 151, the pressing rod 152 abuts against the top of the first test mold 140, the test piece 200 to be tested is fixed on the test piece supporting table 120 through the first test mold 140 and the fixing frame 150, a shearing pressing plate 160 is arranged between the first test mold 140 and the air pressure loading ram 112, and the shearing pressing plate 160 is used for applying a tangential load to the test piece 200 to be tested.
The device is suitable for the condition that the distance from the interlayer bonding surface of the tested piece 200 to the end part of the tested piece 200 is less than the length of the first test mold 140, and the condition mainly aims at the additional layers with the thickness of less than 4cm, such as thin overlay, ultra-thin wearing layer and the like in the highway maintenance engineering, the durability of the pavement is seriously reduced due to insufficient bonding strength between the additional layers and the original pavement, the service life of the pavement is greatly reduced, and therefore the bonding strength between the pavement structure layers paved with the additional layers is necessarily tested. The pneumatic loading pressure head 112 applies pneumatic load in the horizontal direction to the tested test piece 200, the shearing pressure plate 160 applies vertical downward load to the tested test piece 200, the tested test piece 200 can be sheared and damaged along an interlayer joint surface between the first test die 140 and the tested test piece 200 under the dual action of two different loads, lateral pressure is applied to the tested test piece 200 by the pneumatic loading pressure head 112 to simulate tire pressure, shearing force is applied to a pavement structure layer bonding surface through the shearing pressure plate 160 to simulate shearing and kneading action of wheel load on a pavement, accordingly, the pavement shearing and damaging form of a paved layer is accurately simulated, and accurate detection of the pavement structure interlayer bonding strength of the paved layer is achieved.
The device adopts a tested piece 200 which is a cylindrical pavement core sample with the diameter of 1cm, before detection, the tested piece 200 is fixed inside the first test die 140, the top of the test piece support table is tightly contacted with the bottom of the first test die 140, the press rod 152 is positioned in a groove at the top of the first test die 140, the press rod 152 tightly presses the side wall of the tested piece 200, the first test die 140 and the tested piece 200 are tightly fixed between the test piece support table and the press rod 152, one end of the tested piece 200 is tightly contacted with the end surface of the air pressure loading pressure head 112, the other end of the tested piece 200 is tightly contacted with the end surface of the circular base 133, the tested piece 200 is tightly fixed between the air pressure loading pressure head 112 and the circular base 133, so that the tested piece 200 is fully fixed in the horizontal and vertical directions, the stress of the tested piece 200 is uniform, and the test result is more accurate.
Further, the width of the first test mold 140 is 3.5cm to 3.8cm, wherein the width of the first test mold 140 is optimally 3.5cm, the asphalt pavement is generally divided into an upper layer, a middle layer and a lower layer, the thickness of the upper layer of the main flow is 4cm, and in order to detect the firm bonding condition between the asphalt upper layer pavement and the middle layer pavement, the width of the first test mold 140 is designed to be slightly smaller than 4 cm.
Further, the first test die 140 includes an upper die 141 and a lower die 142 having the same structure, a horizontal cylindrical cavity is formed between the upper die 141 and the lower die 142, two sides of the upper die 141 and the lower die 142 are both provided with a protrusion 143, a threaded hole is formed on the protrusion 143, the upper die 141 is connected with the lower die 142 through a bolt 144, a horizontal cylindrical cavity is formed between the upper die 141 and the lower die 142 and used for placing the test piece 200, and the upper die 141 is connected with the lower die 142 through a bolt to tightly fix the test piece 200 between the upper die 141 and the lower die 142.
As shown in fig. 5, further, the lower end of the shear platen 160 has an arc-shaped notch 161, and since the tested piece 200 is a cylinder, the arc-shaped notch 161 at the lower end of the shear platen 160 is closely attached to the surface of the tested piece 200, when the shear platen 160 applies pressure to the tested piece 200, the load applied to the tested piece 200 is uniformly distributed, and the stress concentration is reduced.
Furthermore, the thickness of the shearing pressing plate 160 is 1cm, in order to improve the waterproof and anti-skid performance and flatness of the road surface, a protective thin-layer cover is often laid in the highway maintenance engineering, the thickness of the thin-layer covers is at least 1cm, and the thickness of the shearing pressing plate 160 is 1cm, so that the shearing force can be applied to the thin-layer cover, and the bonding strength between the thin-layer cover and the original road surface can be detected.
Further, a circular gasket 113 is arranged on one side of the air pressure loading ram 112, which is far away from the force transmission column 111, the circular gasket 113 is made of synthetic rubber, and the circular gasket 113 has a sealing function, so that the tested piece 200 is tightly fixed between the end of the force transmission column 111 and the horizontal reaction frame 130, and the stress of the tested piece 200 is uniform.
An embodiment of the present invention further provides a detection method for the above device for detecting interlayer bonding strength of an asphalt pavement, including the following steps:
(1) coring on the road surface: selecting an asphalt pavement interlayer bonding condition detection point, and drilling a pavement core sample to obtain a detected test piece 200; for testing the bonding strength between the asphalt layer and the semi-rigid base layer, the drill core depth needs to comprise a base layer, wherein the pavement structure layer can be divided into the asphalt layer, the base layer and a cushion layer from top to bottom, and common base layer materials comprise cement stabilized macadam, lime macadam and the like; for testing the bonding strength of each sub-layer in the asphalt layer, the drill core depth only needs to comprise the asphalt layer;
(2) preparation of the test: checking the integrity of the tested piece 200 and the flatness of the surfaces of the two ends of the tested piece 200, and if the surface flatness of the two ends of the tested piece 200 is insufficient, cutting to obtain the tested piece 200 with a smooth surface; before the test, the tested piece 200 and the first test mold 140 are placed in a constant temperature box for heat preservation for more than 4 hours, and the test temperature is 20 ℃ or 60 ℃ so as to reflect the interlayer bonding condition of the pavement under normal environment or high temperature condition in summer;
(3) mounting and prepressing: fixing the tested piece 200 in the first test mold 140, fixing the first test mold 140 on the test piece supporting table 120 by the fixing frame 150, starting the air pressure loading device 110 to pre-load the tested piece 200, adjusting the air pressure loading device 110 to enable the air pressure loading pressure head 112 to apply axial pressure to the tested piece 200, and adjusting the horizontal air pressure load to 70KPa to enable the tested piece 200 to be stably stressed at the horizontal and vertical positions; carrying out a single loading shear failure test or a repeated shear fatigue test according to requirements;
(4) single load shear failure test: adjusting the air pressure loading device 110 to make the air pressure loading pressure head 112 apply axial pressure to the tested piece 200, adjusting the horizontal air pressure load to 700KPa, then abutting the lower end of the shearing pressure plate 160 against the upper surface of the tested piece 200, uniformly pressing the tested piece 200 downwards at a rate of 1mm/min, recording the deformation displacement of the tested piece 200 loaded by the shearing pressure plate 160 and the load corresponding to the deformation displacement to obtain a load-deformation curve, as shown in fig. 7, when the load-deformation curve reaches a load peak value FmaxThen gradually decreases to a load peak value FmaxAround 15%; integrating the area enveloped by the load-deformation curve to obtain shear fracture energy W of pavement interlayer bonding, and evaluating the capability of the pavement to resist structural layer separation under the limit shear load;
(5) repeated shear fatigue test: adjusting the air pressure loading device 110 to enable the air pressure loading head 112 to apply axial pressure to the tested piece 200, adjusting the horizontal air pressure load to 700KPa, and adjusting the horizontal air pressure load to 700KPa according to the load peak value FmaxAnd a suitable stress ratio tau/tau0(0.2-0.7) calculating the load level F ═ F of the shear fatigue testmax·(τ/τ0) The loading frequency is 10Hz, when the tested piece 200 is subjected to shear fatigue failure, the loading is stopped, the computer records a group of load-deformation data every 0.004 second, and each time of loading, a load-deformation hysteresis curve is formed by a group of data points, as shown in FIG. 8; calculating the dissipation energy omega of each loading period according to the load-deformation hysteresis curve obtained by the fatigue testiI.e. integrating to obtain the area of the load-deformation hysteresis curve envelope, and applying the dissipation energy omega of each loadingiSumming (the shear fatigue test load-deformation hysteresis curve is shown in figure 9) to obtain the fatigue shear dissipation energy of the road surface
For evaluating the ability of a pavement to resist structural layer separation under repeated shear loads.
Example two
As shown in fig. 6, another device for detecting interlayer bonding strength of an asphalt pavement includes a pedestal 100, an air pressure loading device 110 and a test piece supporting table 120 are disposed at two ends of the pedestal 100, a horizontal reaction frame 130 is disposed on the air pressure loading device 110, as shown in fig. 2 and 3, the horizontal reaction frame 130 includes two horizontal upright columns 131 disposed on the air pressure loading device 110, a cross beam 132 fixed to a common end of the two horizontal upright columns 131, and a circular base 133 fixed to a side of the cross beam 132 close to the air pressure loading device 110, the circular base 133 is located between the two horizontal upright columns 131, the cross beam 132 and the circular base 133 are both located on a side of the test piece supporting table 120 away from the air pressure loading device 110, a force transmission column 111 is further disposed on the air pressure loading device 110, and the force transmission column 111 and the two horizontal upright columns 131 are at the same height, and the pneumatic loading device 110 controls the pneumatic loading pressure head 112 to apply pneumatic load in the horizontal direction to the tested part 200, wherein the length of the force transmission column 111 is smaller than that of the horizontal upright column 131, the end part of the force transmission column 111 is connected with the pneumatic loading pressure head 112, the pneumatic loading pressure head 112 is positioned between the pneumatic loading device 110 and the test piece supporting table 120, and the pneumatic loading device 110 controls the pneumatic loading pressure head 112 to apply pneumatic load in the horizontal direction to the tested part 200.
A second test die 180, a universal tester indenter 170 and a third test die 190 are arranged between the two horizontal columns 131, the third test die 190 is positioned between the air pressure loading indenter 112 and the circular base 133, the bottom of the third test die 190 is fixed at the top of the test piece supporting table 120, the second test die 180 is positioned between the third test die 190 and the air pressure loading indenter 112, the axis of the second test die 180 is coincident with the axis of the third test die 190, the universal tester indenter 170 is positioned above the second test die 180, the lower end of the universal tester indenter 170 abuts against the top side wall of the second test die 180, and the universal tester indenter 170 is used for loading a tested test piece 200 vertically downwards; the device is characterized by further comprising a fixing frame 150, wherein the fixing frame 150 comprises two vertical fixing rods 151 respectively arranged on two sides of the third test die 190 and a pressing rod 152 jointly fixed with the top ends of the two vertical fixing rods 151, the pressing rod 152 abuts against the top of the third test die 190, and a tested piece 200 is fixed on the test piece supporting table 120 through the third test die 190 and the fixing frame 150.
The device is suitable for the condition that the distance between the interlayer bonding surface of the tested piece 200 and the two ends of the tested piece 200 exceeds the length of the second test mold 180. The air pressure loading pressure head 112 applies horizontal pneumatic load to the tested piece 200, the universal testing machine pressure head 170 applies vertical downward load to the tested piece 200, under the dual action of two different loads, the tested piece 200 can be subjected to shearing damage along the interlayer junction surface between the third test die 190 and the second test die 180, the air pressure loading pressure head 112 applies lateral pressure to the tested piece 200 to simulate tire pressure, and the universal testing machine applies shearing force to the interlayer junction surface of the asphalt pavement to simulate shearing and kneading action of the wheel load on the pavement, so that the shearing damage form of the pavement is accurately simulated, and the accurate detection of the bonding strength of the interlayer junction surface of the asphalt pavement is realized.
The device for detecting the bonding strength between the road surface layers has the following advantages: firstly, the device can simultaneously apply wheel load pressure and shearing force in the horizontal and vertical directions, thereby more accurately simulating the shearing damage form of the road surface; secondly, based on a universal testing machine platform, the testing temperature can be controlled by means of a constant temperature box of the universal testing machine platform so as to simulate interlayer shear damage of the road surface in the environment with adverse normal temperature and high temperature; thirdly, a single shear failure test and a repeated shear fatigue test can be developed based on the device, and the ultimate shear resistance and the fatigue shear failure resistance of the pavement can be scientifically and comprehensively reflected according to two indexes of the shear fracture energy and the repeated shear dissipation energy. Based on the method, scientific interlayer bonding strength detection evaluation can be carried out on the pavement structure core sample, and the progress from fuzzy qualitative evaluation to accurate quantitative evaluation is realized.
Further, the second test mold 180 and the third test mold 190 have the same structure, the second test mold 180 includes an upper mold 181 and a lower mold 182 having the same structure, a horizontal cylindrical cavity is formed between the upper mold 181 and the lower mold 182, fixing portions 183 are disposed on two sides of the upper mold 181 and the lower mold 182, screw holes 184 are disposed on the fixing portions 183, and the upper mold 181 is connected to the lower mold 182 through bolts penetrating through the screw holes 184. A horizontal cylindrical cavity is formed between the upper die 181 and the lower die 182 for accommodating the tested object 200, and the upper die 181 is connected to the lower die 182 by a bolt penetrating through the threaded hole 184, so as to tightly fix the tested object 200 between the upper die 181 and the lower die 182.
An embodiment provides a detection method for the above device for detecting interlayer bonding strength of an asphalt pavement, the method includes the following steps:
(1) coring on the road surface: selecting an asphalt pavement interlayer bonding condition detection point, and drilling a pavement core sample to obtain a detected test piece 200; for testing the bonding strength between the asphalt layer and the semi-rigid base layer, the drill core depth needs to comprise a base layer, wherein the pavement structure layer can be divided into the asphalt layer, the base layer and a cushion layer from top to bottom, and common base layer materials comprise cement stabilized macadam, lime macadam and the like; for testing the bonding strength of each sub-layer in the asphalt layer, the drill core depth only needs to comprise the asphalt layer;
(2) preparation of the test: checking the integrity of the tested piece 200 and the flatness of the surfaces of the two ends of the tested piece 200, and if the surface flatness of the two ends of the tested piece 200 does not meet the testing requirement, cutting to obtain the complete tested piece 200; before testing, the tested piece 200, the second test mold 180 and the third test mold 190 are placed in a constant temperature box for heat preservation for more than 4 hours, and the testing temperature is 20 ℃ or 60 ℃ so as to reflect the interlayer bonding condition of the pavement under normal environment or high temperature condition in summer;
(3) mounting and prepressing: fixing the tested piece 200 in the second test mold 180 and the third test mold 190, making the interlayer joint surface of the tested piece 200 between the second test mold 180 and the third test mold 190, fixing the third test mold 190 on the test piece support table 120 by the fixing frame 150, starting the air pressure loading device 110 to pre-press and load the tested piece 200, adjusting the air pressure loading device 110, making the air pressure loading head 112 apply axial pressure to the tested piece 200, adjusting the horizontal air pressure load to 70KPa, and performing a single loading shear failure test or a repeated shear fatigue test according to requirements;
(4) single load shear failure test: adjusting the air pressure loading device 110 to enable the air pressure loading head 112 to apply axial pressure to the tested piece 200, adjusting the horizontal air pressure load to 700KPa, then enabling the lower end of the universal testing machine pressure head 170 to abut against the side wall of the tested piece 200, uniformly and downwards extruding the tested piece 200 at the speed of 1mm/min, and recording that the universal testing machine pressure head 170 is loaded on the tested piece 200Deformation displacement and load corresponding to the deformation displacement to obtain a load-deformation curve, and when the load-deformation curve reaches a load peak value FmaxWhen the load gradually decreases to the vicinity of 15% of the load peak value, integrating the area enveloped by the load-deformation curve to obtain the shear fracture energy W of the pavement interlayer bonding, and evaluating the capability of the pavement for resisting structural layer separation under the limit shear load;
(5) repeated shear fatigue test: adjusting the air pressure loading device 110 to enable the air pressure loading head 112 to apply axial pressure to the tested piece 200, adjusting the horizontal air pressure load to 700KPa, and adjusting the horizontal air pressure load to 700KPa according to the load peak value FmaxAnd a suitable stress ratio tau/tau0(0.2-0.7) calculating the load level F ═ F of the shear fatigue testmax·(τ/τ0) The loading frequency is 10Hz, when the tested piece 200 is subjected to shear fatigue failure, the loading is stopped, the computer records a group of load-deformation data every 0.004 second, and a load-deformation hysteresis curve is formed by a group of data points during each loading; calculating the dissipation energy omega of each loading period according to a load-deformation hysteresis curve obtained by a fatigue testiThat is, the area of the envelope of the load-deformation hysteresis curve is obtained by integration, and the dissipation energy omega of each loading in the fatigue life N is converted into the dissipation energy of each loadingiSumming to obtain the fatigue shear dissipation energy of road surface
The method is used for evaluating the capability of the pavement to resist structural layer separation under repeated shearing load.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.
Claims (6)
1. A detection method of a device for detecting the interlayer bonding strength of an asphalt pavement is characterized by comprising the following steps:
the asphalt pavement interlayer bonding strength detection device comprises a pedestal (100), wherein an air pressure loading device (110) and a test piece supporting table (120) are arranged on two sides of the upper surface of the pedestal (100), a horizontal reaction frame (130) is arranged on the air pressure loading device (110), the horizontal reaction frame (130) comprises two horizontal upright columns (131) arranged at the end part of the air pressure loading device (110), a cross beam (132) fixed at one common end of the two horizontal upright columns (131) and a circular base (133) fixed at one side, close to the air pressure loading device (110), of the cross beam (132), the circular base (133) is positioned between the two horizontal upright columns (131), the cross beam (132) and the circular base (133) are both positioned at one side, far away from the air pressure loading device (110), of the test piece supporting table (120), and a force transfer column (111) is further arranged on the air pressure loading device (110), the force transmission column (111) and the two horizontal upright columns (131) are located at the same height and are located between the two horizontal upright columns (131), the length of the force transmission column (111) is smaller than that of the horizontal upright columns (131), the end part of the force transmission column (111) is connected with an air pressure loading pressure head (112), and the air pressure loading pressure head (112) is located between the air pressure loading device (110) and the test piece supporting table (120);
a first test die (140) is arranged between the two horizontal columns (131), the first test die (140) is positioned between the air pressure loading pressure head (112) and the circular base (133), the first test die (140) is fixed to the top of the test piece supporting table (120) through a fixing frame (150), the fixing frame (150) comprises two vertical fixing rods (151) respectively arranged on two sides of the first test die (140) and a pressure lever (152) jointly fixed to the top ends of the two vertical fixing rods (151), the pressure lever (152) abuts against the top of the first test die (140), and a shearing pressure plate (160) connected with a universal testing machine is arranged between the first test die (140) and the air pressure loading pressure head (112);
a circular gasket (113) is arranged on one side, away from the force transmission column (111), of the air pressure loading pressure head (112), and the circular gasket (113) is made of synthetic rubber;
the lower end of the shearing pressure plate (160) is provided with an arc-shaped notch (161);
the method comprises the following steps:
(1) coring on the road surface: selecting a detection point of the interlayer bonding condition of the asphalt pavement, and drilling a pavement core sample to obtain a detected test piece (200); for testing the bonding strength between the asphalt layer and the semi-rigid base layer, the drilling core depth needs to comprise the base layer, the pavement structure layer can be divided into the asphalt layer, the base layer and the cushion layer from top to bottom, and common base layer materials comprise cement stabilized macadam, lime macadam and the like; for testing the bonding strength of each sub-layer in the asphalt layer, the drill core depth only needs to comprise the asphalt layer;
(2) preparation of the test: checking the integrity of the tested piece (200) and the flatness of the surfaces of the two ends of the tested piece (200), and if the flatness of the surfaces of the two ends of the tested piece (200) does not meet the testing requirement, cutting to obtain a flat tested piece (200); before testing, a tested piece (200) and the first test mold (140) are placed in a constant temperature box for heat preservation for more than 4 hours, and the test temperature is 20 ℃ or 60 ℃ so as to reflect the interlayer bonding condition of the road surface under normal environment or high temperature condition in summer;
(3) mounting and prepressing: fixing a tested piece (200) in the first test mold (140), fixing the first test mold (140) on the test piece supporting table (120) through the fixing frame (150), starting the air pressure loading device (110) to pre-press and load the tested piece (200), adjusting the air pressure loading device (110), enabling the air pressure loading pressure head (112) to apply axial pressure to the tested piece (200), enabling the air pressure load to be 70KPa, and performing a single loading shear failure test or a repeated shear fatigue test according to requirements;
(4) single load shear failure test: adjusting the air pressure loading device (110) to enable the air pressure loading pressure head (112) to apply axial pressure to the tested piece (200), adjusting the horizontal air pressure load to 700KPa, then enabling the lower end arc notch (161) of the shearing pressure plate (160) to abut against the upper surface of the tested piece (200), uniformly and downwards extruding the tested piece (200) at the speed of 1mm/min, recording the deformation displacement of the tested piece (200) loaded by the shearing pressure plate (160) and the load corresponding to the deformation displacement, obtaining a load-deformation curve, and when the load-deformation curve reaches a load peak value FmaxThen gradually decreases to a load peak value FmaxAround 15%; wrapping the load-deformation curveIntegrating the area of the complex to obtain the shear fracture energy W of the interlayer bonding of the pavement;
(5) repeated shear fatigue test: adjusting the air pressure loading device (110) to enable the air pressure loading pressure head (112) to apply axial pressure to the tested piece (200), adjusting the horizontal air pressure load to 700KPa, and adjusting the horizontal air pressure load to 700KPa according to a load peak value FmaxAnd a suitable stress ratio tau/tau0Calculating the load level F ═ F of the shear fatigue testmax·(τ/τ0)，τ/τ0The range of the load is 0.2-0.7, the loading frequency is 10Hz, when the tested piece (200) is subjected to shear fatigue failure, the loading is stopped, the computer records a group of load-deformation data every 0.004 seconds, and each loading comprises 25 groups of data points to form a load-deformation hysteresis curve; calculating the dissipation energy omega of each loading period according to a load-deformation hysteresis curve obtained by a fatigue testiThat is, the area of the envelope of the load-deformation hysteresis curve is obtained by integration, and the dissipation energy omega of each loading in the fatigue life N is converted into the dissipation energy of each loadingiSumming to obtain the fatigue shear dissipation energy of road surface
2. The detection method of the device for detecting interlayer bonding strength of an asphalt pavement according to claim 1, characterized in that:
the length of the first test mold (140) is 3.5cm-3.8 cm.
3. The detection method of the device for detecting interlayer bonding strength of an asphalt pavement according to claim 1, characterized in that:
the first test die (140) comprises an upper pressing die (141) and a lower pressing die (142) which are identical in structure, a horizontal cylindrical cavity is formed between the upper pressing die (141) and the lower pressing die (142), protruding portions (143) are arranged on two sides of the upper pressing die (141) and two sides of the lower pressing die (142), threaded holes are formed in the protruding portions (143), and the upper pressing die (141) is connected with the lower pressing die (142) through bolts.
4. The detection method of the device for detecting interlayer bonding strength of an asphalt pavement according to claim 1, characterized in that:
the thickness of the shearing pressure plate (160) is 1cm, and the shearing pressure plate is made of stainless steel.
5. A detection method of a device for detecting the interlayer bonding strength of an asphalt pavement is characterized by comprising the following steps:
the asphalt pavement interlayer bonding strength detection device comprises a pedestal (100), wherein an air pressure loading device (110) and a test piece supporting table (120) are arranged on two sides of the upper surface of the pedestal (100), a horizontal reaction frame (130) is arranged on the air pressure loading device (110), the horizontal reaction frame (130) comprises two horizontal upright columns (131) arranged on the air pressure loading device (110), a cross beam (132) fixed at one common end of the two horizontal upright columns (131) and a circular base (133) fixed on one side, close to the air pressure loading device (110), of the cross beam (132), the circular base (133) is positioned between the two horizontal upright columns (131), the cross beam (132) and the circular base (133) are both positioned on one side, far away from the air pressure loading device (110), of the test piece supporting table (120), and a force transfer column (111) is further arranged on the air pressure loading device (110), the force transmission column (111) and the two horizontal upright columns (131) are located at the same height and are located between the two horizontal upright columns (131), the length of the force transmission column (111) is smaller than that of the horizontal upright columns (131), the end part of the force transmission column (111) is connected with an air pressure loading pressure head (112), and the air pressure loading pressure head (112) is located between the air pressure loading device (110) and the test piece supporting table (120);
a second test die (180), a universal tester pressure head (170) and a third test die (190) are arranged between the two horizontal columns (131), the third test die (190) is positioned between the air pressure loading pressure head (112) and the circular base (133), the bottom of the third test die (190) is fixed at the top of the test piece supporting table (120), the second test die (180) is positioned between the third test die (190) and the air pressure loading pressure head (112), the axis of the second test die (180) is superposed with the axis of the third test die (190), the universal tester pressure head (170) is positioned above the second test die (180), the lower end of the universal tester pressure head (170) is abutted against the top of the second test die (180), the universal tester pressure head further comprises a fixing frame (150), the fixing frame (150) comprises two vertical fixing rods (151) respectively arranged at two sides of the third test die (190) and a fixing frame (151) with the top ends of the two vertical fixing rods (151) The pressing rods (152) are fixed together, and the pressing rods (152) abut against the top of the third test die (190);
the method comprises the following steps:
(1) coring on the road surface: selecting a detection point of the interlayer bonding condition of the asphalt pavement, and drilling a pavement core sample to obtain a detected test piece (200); wherein, for testing the bonding strength between the asphalt layer and the semi-rigid base layer, the drill core depth comprises the base layer; for testing the bonding strength inside the asphalt layer, the drill core depth only needs to comprise the asphalt layer;
(2) preparation of the test: checking the integrity of the tested piece (200) and the flatness of the surfaces of the two ends of the tested piece (200), and if the flatness of the surfaces of the two ends of the tested piece (200) does not meet the testing requirement, cutting to obtain a flat tested piece (200); before testing, a tested piece (200), the second test mold (180) and the third test mold (190) are placed in a constant temperature box for heat preservation for more than 4 hours, and the testing temperature is 20 ℃ or 60 ℃ so as to reflect the interlayer bonding condition of the pavement under normal environment or high temperature condition in summer;
(3) mounting and prepressing: fixing a tested piece (200) in the second test die (180) and the third test die (190), enabling an interlayer joint surface of the tested piece (200) to be located between the second test die (180) and the third test die (190), fixing the third test die (190) on the test piece supporting table (120) through the fixing frame (150), starting the air pressure loading device (110) to pre-press and load the tested piece (200), adjusting the air pressure loading device (110), enabling the air pressure loading pressure head (112) to apply axial pressure to the tested piece (200), adjusting the horizontal air pressure load to 70KPa, and performing a single-loading shear failure test or a repeated shear fatigue test according to requirements;
(4) single load shear failure test: adjusting the air pressure loading device (110) to enable the air pressure loading pressure head (112) to apply axial pressure to the tested piece (200)Adjusting the force and the horizontal air pressure load to 700KPa, then supporting the lower end of the universal tester pressure head (170) against the top of the second test mould (180), uniformly pushing the tested piece (200) downwards at the speed of 1mm/min, recording the deformation displacement of the universal tester pressure head (170) loaded on the tested piece (200) and the load corresponding to the deformation displacement to obtain a load-deformation curve, and when the load-deformation curve reaches a load peak value FmaxThen gradually reducing to 15% of the load peak value, integrating the area enveloped by the load-deformation curve to obtain the shear fracture energy W of the pavement interlayer bonding;
(5) repeated shear fatigue test: adjusting the air pressure loading device (110) to enable the air pressure loading pressure head (112) to apply axial pressure to the tested piece (200), adjusting the horizontal air pressure load to 700KPa, and adjusting the horizontal air pressure load to 700KPa according to a load peak value FmaxAnd a suitable stress ratio tau/tau0Calculating the load level F ═ F of the shear fatigue testmax·(τ/τ0)，τ/τ0The range of the load is 0.2-0.7, the loading frequency is 10Hz, when the tested piece (200) is subjected to shear fatigue failure, the loading is stopped, the computer records a group of load-deformation data every 0.004 seconds, and each loading comprises 25 groups of data points to form a load-deformation hysteresis curve; calculating the dissipation energy omega of each loading period according to a load-deformation hysteresis curve obtained by a fatigue testiThat is, the area of the envelope of the load-deformation hysteresis curve is obtained by integration, and the dissipation energy omega of each loading in the fatigue life N is converted into the dissipation energy of each loadingiSumming to obtain the fatigue shear dissipation energy of road surface
6. The detection method of the device for detecting interlayer bonding strength of an asphalt pavement according to claim 5, characterized in that:
the second test die (180) and the third test die (190) are identical in structure, the second test die (180) comprises an upper die (181) and a lower die (182) which are identical in structure, a horizontal cylindrical cavity is formed between the upper die (181) and the lower die (182), fixing portions (183) are arranged on two sides of the upper die (181) and the lower die (182), threaded holes are formed in the fixing portions (183), and the upper die (181) is connected with the lower die (182) through bolts.
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| CN109342147B (en) * | 2018-11-30 | 2021-01-26 | 河海大学 | Preparation device for columnar jointed rock mass sample with inclination angle |
| CN109765128B (en) * | 2019-01-22 | 2022-03-29 | 广西交科集团有限公司 | Asphalt anti-aging performance evaluation method based on dissipation energy |
| CN110421691A (en) * | 2019-08-14 | 2019-11-08 | 安徽省交通控股集团有限公司 | Bonding strength test model preparation method between Cement Concrete Deck Paving Course |
| JP7260598B2 (en) * | 2020-07-09 | 2023-04-18 | ニチレキ株式会社 | Interlaminar adhesion breaking test method, test equipment, and test piece preparation method |
| CN112540011A (en) * | 2020-11-30 | 2021-03-23 | 西南交通大学 | Asphalt pavement interlayer pressing-shearing coupling shearing equipment |
| CN112393992A (en) * | 2020-12-09 | 2021-02-23 | 中钢集团洛阳耐火材料研究院有限公司 | Refractory material anti-shearing test equipment and test method |
| CN113176203B (en) * | 2021-03-30 | 2022-06-28 | 河北交规院瑞志交通技术咨询有限公司 | Interlayer bonding strength test system |
| CN114486505A (en) * | 2022-01-12 | 2022-05-13 | 东南大学 | Test fixture device and test method for interlayer contact parameters of pavement structure |
| CN114527065B (en) * | 2022-01-26 | 2023-12-22 | 东南大学 | Pavement heating type sealant adhesive property evaluation method based on dissipation energy |
| CN116026711B (en) * | 2023-03-30 | 2023-06-20 | 江苏腾达工程检测有限公司 | Asphalt pavement shearing fatigue degree detection equipment |
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| JP2008076314A (en) * | 2006-09-22 | 2008-04-03 | Kochi Univ Of Technology | Concrete shearing testing method and shearing testing tool |
| CN202748276U (en) * | 2012-08-24 | 2013-02-20 | 华南理工大学 | Shearing device for asphalt pavement cylinder test specimen layer |
| CN103630448B (en) * | 2013-07-25 | 2015-11-18 | 广西交通科学研究院 | A kind of pavement structure interlayer interface shear strength testing apparatus and method thereof |
| CN104655557B (en) * | 2013-11-21 | 2018-03-02 | 交通运输部科学研究院 | The equipment that measurement asphalt surface course is coupled anti-staight scissors performance with semi-rigid type base interlayer |
| CN104062190B (en) * | 2014-04-21 | 2017-02-22 | 青海省公路科研勘测设计院 | Shearing strength detection method for new and old pavement connecting layer material |
| CN204658256U (en) * | 2015-06-01 | 2015-09-23 | 吉林省嘉鹏集团有限公司 | A kind of for the clamp mechanism of bituminous paving interlayer in conjunction with shearing test |
| CN204789177U (en) * | 2015-06-01 | 2015-11-18 | 吉林省嘉鹏集团有限公司 | Combine shear test equipment between bituminous paving layer |
| CN206573376U (en) * | 2016-12-23 | 2017-10-20 | 上海同科交通科技有限公司 | A kind of pavement structure interlayer shearing test device |
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