CN112147054B - Rapid test method for matrix communication porosity of semi-flexible pavement - Google Patents
Rapid test method for matrix communication porosity of semi-flexible pavement Download PDFInfo
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- 239000011159 matrix material Substances 0.000 title claims abstract description 25
- 238000004891 communication Methods 0.000 title claims abstract description 15
- 238000010998 test method Methods 0.000 title description 3
- 238000012360 testing method Methods 0.000 claims abstract description 170
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000005259 measurement Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000010426 asphalt Substances 0.000 claims description 30
- 239000011521 glass Substances 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000005303 weighing Methods 0.000 claims description 9
- 238000005056 compaction Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 3
- 210000002268 wool Anatomy 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000011800 void material Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011384 asphalt concrete Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000013521 mastic Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0893—Investigating volume, surface area, size or distribution of pores; Porosimetry by measuring weight or volume of sorbed fluid, e.g. B.E.T. method
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Road Repair (AREA)
Abstract
The invention discloses a method for rapidly testing the matrix connection porosity of a semi-flexible pavement, and mainly relates to the field of porosity measurement. Comprises 1) preparation and measurement of a test mold, 2) preparation of a test piece, 3) calculation of total porosity VV (%), 4) treatment of the test piece, 5) calculation of a communication gap V c (cm 3 ) And a communicating porosity VV c (%), the procedure was repeated four times and VV was taken c Average value of (a). The invention has the beneficial effects that: the method does not need to demould and wait for the test piece, and can quickly measure the communication porosity on the premise of ensuring the error precision so as to ensure the construction quality requirement of the matrix.
Description
Technical Field
The invention relates to the field of porosity detection, in particular to a method for rapidly testing the matrix connected porosity of a semi-flexible pavement.
Background
In the road pouring type semi-flexible pavement matrix asphalt mixture, the total porosity and the communication porosity are important indexes for measuring the large-void asphalt mixture. Because the total void of the large-void asphalt mixture is large (reaching 20-30 percent), similar to large-void water permeability open-graded asphalt mixture (OGFC), the method for measuring the total void ratio and the connected void ratio is a volume method according to the two specifications and regulations of the existing road engineering asphalt and asphalt mixture test regulation JTG E20-2011 and road filling type semi-flexible pavement technical regulation T/CECS G D51-01-2019. Wherein, the road engineering asphalt and asphalt mixture test procedure JTG E20-2011 T0708-2011 compacted asphalt mixture density test (volume method) is used for measuring the total void ratio of the large-void asphalt mixture. The method is used for measuring the communication voidage of the large-void asphalt mixture in appendix A of road injection type semi-flexible pavement technical specification T/CECS G D51-01-2019;
the method requires that after the emulsified asphalt mixture test pieces are compacted on both sides, a group of test pieces are transversely placed for 24h at room temperature, 5.2 test pieces require to remove the sleeve and the base, the test mold with the test pieces is transversely placed and cooled to room temperature, and then the test pieces are removed from a mold stripping machine. In the construction quality inspection process, if an urgent test is needed, demoulding is allowed by adopting a method of blowing cold for 1 hour by an electric fan or cooling for more than 3min by soaking in water; however, the immersion demolding method cannot be used for measuring various physical test indexes such as density, porosity and the like;
in the large-gap asphalt mixture discharging process, in order to control the construction quality, test detection personnel need to rapidly measure the total porosity and the communication porosity, the production mix proportion is adjusted through measured indexes, the total porosity and the communication porosity of the large-gap asphalt mixture reach the design requirements, and the later grouting material is ensured to be poured into the large-gap asphalt mixture as required. The traditional volume method needs to cool the just-formed test piece for 24 hours and then demould the test piece, which obviously cannot meet the requirement of the urgent test in the construction quality inspection process. Whereas the 3min immersion cooling recommended by the specifications does not meet the requirements (porosity cannot be determined). After the electric fan is cooled by blowing for 1 hour and demolded, when the communication porosity is measured and the mass of a test piece in water is measured, the test piece is generally soaked for 1 hour to ensure that a component completely absorbs water, so that the test piece measuring time is prolonged and the requirement of rapid measurement cannot be met.
Disclosure of Invention
The invention aims to provide a method for rapidly testing the matrix communicating porosity of a semi-flexible pavement, which does not need to demould and wait a test piece, and can rapidly measure the communicating porosity on the premise of ensuring error precision so as to ensure the construction quality requirement of the matrix.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for rapidly testing the matrix connection porosity of a semi-flexible pavement comprises the following steps:
1) Preparing and measuring a test mold, weighing the mass m of a hollow test mold with an open top 1 Measuring the total height h of the test mold 1 Measuring the inner diameter d of the test mold 1 ；
2) And (3) manufacturing a test piece, namely manufacturing the test piece of the asphalt mixture matrix by using a compaction method, wherein the test piece is in a cylindrical shape matched with the inner diameter of the test mold, so that the test piece is molded in the test mold, and the test piece is cooled after being molded until the test piece does not flow under the action of gravity.
3) Calculating the total porosity VV (%), weighing the total weight m of the test piece and the test mold 2 Separately measuring the heights h from the top and the bottom of the test piece to the test mold 2 And h 3 Calculating the gross volume V (cm) of the test piece 3 ) And the gross density ρ of the test piece s (g/cm 3 ) Then, then
ρ t Is the maximum theoretical density of the asphalt matrix.
4) Treating the test piece, placing the test mold with the test piece on one of the glass plates, smearing a waterproof sealing layer at the junction position of the test mold and the glass plate, and weighing the total weight m after smearing 3 Measuring the water temperature, and checking the density of the water at the temperature to be rho through a table look-up w Adding water into the test mould to gradually remove air bubbles in the test piece, adding water to the top of the test mould, and adding another test piece with mass m 4 The glass plate is covered on the top of the test mould, water on the test mould and the glass plate is erased, and the weight m is weighed 5 。
5) Calculating the communication gap V c (cm 3 ) And a communicating porosity VV c (％)，
Repeating the method for four times, and taking VV c Average value of (a).
Furthermore, the waterproof sealing layer is waterproof putty, the glass plate is vibrated when water is added into the test mold, and water is added into the test mold to the top by using a aurilave to enable the top to present a convex liquid surface by taking the relative position of the test mold and the glass plate as a boundary without disturbance.
Further, the mass during measurement is accurate to 0.1g, and the length is accurate to 0.1cm.
Furthermore, when the compaction method is used for manufacturing the test piece of the asphalt mixture matrix, the number of times of compacting the two surfaces of the test piece is not less than 50 times.
Furthermore, when the test piece is manufactured, the test piece is placed in room temperature for cooling for 20 minutes or cooled by blowing with an electric fan for 10 minutes after being molded.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes a compaction method to make and mold a test piece in a test mold, then the test mold is placed on one glass plate, a waterproof sealing layer is utilized to seal the boundary position between the test mold and the glass plate, then water is added into the test mold to simulate the grouting operation of a construction site, and then the subsequent measurement operation is carried out.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Reference numerals shown in the drawings:
1. testing the mold; 2. a test piece; 3. a glass plate.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope defined by the present application.
The invention relates to a method for rapidly testing the matrix communication porosity of a semi-flexible pavement, which comprises the following steps:
1) Preparing and measuring a test mold 1, weighing the mass m of a hollow test mold 1 with an open top 1 The electronic balance can be used for weighing to ensure the measurement precision, and the vernier caliper is used for measuring the total height h of the test die 1 1 Measuring the inner diameter d of the test mold 1 1 The test mold 1 can be made using the manufacturing standard of the marshall test mold, wherein h 1 Has a standard size of 87 mm, d 1 The standard size of (2) is 101.6 +/-0.2 mm, so that the detection is more standardized;
2) Manufacturing a test piece 2, namely manufacturing the test piece 2 of the asphalt mixture matrix by using a compaction method, wherein a standard Marshall test piece can be adopted, the size of the cylindrical test piece is phi 101.6mm multiplied by 63.5mm, the test piece 2 is manufactured into a cylinder shape matched with the inner diameter of a test mold 1, specifically, the asphalt mixture matrix is placed in the test mold 1, the test piece 2 is molded in the test mold 1 by compacting the surface of the test piece 2, the test piece 2 is cooled after molding, the test piece 2 can be cooled at room temperature or under the assistance of other external force, the cooling time can be within 30 minutes, and the test piece 2 can not flow under the action of gravity, so that the test piece 2 can be preliminarily molded in the test mold 1, the long-time cooling is not required, the test piece 2 is not required to be demolded, and the test piece 2 can be directly measured in the test mold 1.
3) Calculating the total porosity VV%, weighing the total weight m of the test piece 2 and the test mould 1 by using an electronic balance 2 Separately measuring the heights h of the top and bottom of the test piece 2 to the test mold 1 2 And h 3 The test piece 2 exists in the test die 1h 2 And h 3 In the other space, the test piece is closely contacted with the inner wall of the test mold 1 through compaction operation, so that the volume of the test mold 1 at the end is the volume of the test piece 2, and the gross volume Vcm of the test piece 2 is calculated 3 And the wool density ρ of test piece 2 s g/cm 3 Then, then
ρ t The maximum theoretical density of the asphalt mixture matrix can be calculated by the design method B.5.6 of the mix proportion of the hot-mix asphalt mixture in appendix B of JTG F40-2004 technical Specification for construction of road asphalt pavements.
4) The test piece 2 is processed, the test mould 1 with the test piece 2 is placed on one of the glass plates 3, namely the glass plate 3 is positioned on the test mould 1The bottom of the test mold 1 is coated with a waterproof sealing layer at the junction position of the test mold 1 and the glass plate 3, so that the sealing performance of the glass plate 3 and the bottom of the test mold 1 is ensured, the coating degree is based on the water tightness of the bottom of the test mold 1, and the total weight m is weighed by using an electronic balance after the coating is finished 3 Measuring the temperature of water, and looking up the density of the water at the temperature as rho by a table w Then adding water into the test mold 1 to fill water into the communicated gap in the test piece 2, gradually removing air bubbles in the test piece 2, gradually adding water to the top of the test mold 1 by using an aurilave, and using another piece with the mass of m 4 The glass plate 3 is covered on the top of the test mould 1, the bottom of the upper glass plate 3 is fully contacted with water, the water on the test mould 1 and the glass plate 3 is erased, and the weight m is weighed 5 In the process, the space between the upper glass plate 3 and the lower glass plate 3 is completely filled with water, so that the number of bubbles is reduced, and the accuracy of data is ensured.
5) Calculating the communication gap V c cm3 and interconnected porosity VV c ％，
Repeating the method for four times to obtain VV c The average value of the porosity and the accuracy of the numerical value are 0.1%, through actual operation, the obtained measurement result and the difference value of the total porosity and the communicated porosity measured by the traditional method are within an acceptable range, sufficient direction guidance can be provided for production, the experiment time is greatly reduced, and the construction progress is ensured.
Preferably, waterproof sealing layer is waterproof putty, waterproof putty's water-proof effects is good and bonding performance is enough, can play better leakproofness, vibration glass board 3 when adding water in the examination mould 1, use the relative position of undisturbed examination mould 1 and glass board 3 as the border, such operation can make more abundant packing of water circulate in the intercommunication space of test piece 2 and between them, further improve the accuracy of data, add water to the top with the aurilave in to examination mould 1 and make the top present the convex liquid level, can guarantee moisture more abundant with the contact of glass board like this after placing glass board 3 at the top of examination mould 1, reduce the quantity of air bubble, make the volume of water and the volume in the space of intercommunication more close, guarantee the accurate precision of final data.
Preferably, the mass during measurement is accurate to 0.1g, the length is accurate to 0.1cm, the precision of the method is consistent with that of the traditional measurement mode and is even stricter, so that the error of the traditional operation is reduced, and sufficient data support is provided for production quickly.
Preferably, when the test piece 2 of the asphalt mixture matrix is manufactured by a compaction method, the number of times of compacting the two surfaces of the test piece 2 is not less than 50, so that the compacting operation of actual production in the forming process of the test piece 2 is closer to that of actual production, the errors of the communication porosity data of test measurement and the communication porosity of the asphalt concrete matrix in the real construction process are reduced, and the accuracy of the test measurement data is improved.
Preferably, when the test piece 2 is manufactured, the test piece 2 is placed in room temperature for cooling for 20 minutes or cooled by blowing with an electric fan for 10 minutes after being molded, the large-gap asphalt mixture is more coarse aggregates, less fine aggregates and less filler, the coarse aggregates are connected by cementation of mastic formed by asphalt and lignin fibers, and when the temperature is higher, the marshall test piece of the large-gap asphalt mixture flows and deforms under the action of dead weight, so that the test piece needs to be cooled before the communicated porosity is determined, and accurate measurement can be carried out without flowing and deforming of the test piece.
Claims (5)
1. A method for rapidly testing the matrix connection porosity of a semi-flexible pavement is characterized by comprising the following steps: the method comprises the following steps:
1) Preparing and measuring a test mold (1), weighing the mass m of a hollow test mold (1) with an open top 1 Measuring the total height h of the test model (1) 1 Measuring the inner diameter d of the test die (1) 1 ；
2) Manufacturing a test piece (2), namely manufacturing the test piece (2) of the asphalt mixture matrix by using a compaction method, wherein the test piece (2) is in a cylindrical shape matched with the inner diameter of the test mold (1), so that the test piece (2) is molded in the test mold (1), and cooling is carried out after the test piece (2) is molded until the test piece (2) does not flow under the action of gravity;
3) Calculating the total porosity VV (%), weighing the total weight m of the test piece (2) and the test mold (1) 2 Separately measuring the height h from the top and bottom of the test piece (2) to the test mold (1) 2 And h 3 The gross volume V (cm) of the test piece (2) is calculated 3 ) And the wool density ρ of the test piece (2) s (g/cm 3 ) Then, then
ρ t The maximum theoretical density of the asphalt mixture matrix;
4) Treating the test piece (2), placing the test die (1) with the test piece (2) on one glass plate (3), smearing a waterproof sealing layer at the junction position of the test die (1) and the glass plate (3), and weighing the total weight m after smearing 3 Measuring the temperature of water, and looking up the density of the water at the temperature as rho by a table w Adding water into the test mold (1) to gradually remove air bubbles in the test piece (2), adding water to the top of the test mold (1), and using another piece with the mass of m 4 The glass plate (3) is covered on the top of the test mould (1), the moisture on the test mould (1) and the glass plate (3) is erased, and the weight m is weighed 5 ；
5) Calculating the communication gap V c (cm 3) and interconnected porosity VV c (％)，
Repeating the method for four times to obtain VV c Average value of (a).
2. The method for rapidly testing the matrix connection porosity of the semi-flexible pavement according to claim 1, wherein the method comprises the following steps: the waterproof sealing layer is waterproof putty, the glass plate (3) is vibrated when water is added into the test mold (1), the relative position of the test mold (1) and the glass plate (3) is not disturbed as a boundary, and a lug washing ball is used for adding water into the test mold (1) until the top of the test mold is raised.
3. The method for rapidly testing the interconnected porosity of the semi-flexible pavement substrate according to claim 1, wherein the method comprises the following steps: the mass during the measurement is accurate to 0.1g, and the length is accurate to 0.1cm.
4. The method for rapidly testing the matrix connection porosity of the semi-flexible pavement according to claim 1, wherein the method comprises the following steps: when the test piece (2) of the asphalt mixture matrix is manufactured by using a compaction method, the times of compacting the two surfaces of the test piece (2) are not less than 50.
5. The method for rapidly testing the matrix connection porosity of the semi-flexible pavement according to claim 1, wherein the method comprises the following steps: when the test piece (2) is manufactured, the test piece (2) is placed in room temperature for cooling for 20 minutes or cooled by blowing with an electric fan for 10 minutes.
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| CN117517163A (en) * | 2023-10-30 | 2024-02-06 | 辽宁省水利水电科学研究院有限责任公司 | Method for detecting void ratio of water-injection-impregnation closed ecological grid structure |
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