CN109342218A - Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method - Google Patents

Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method Download PDF

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Publication number
CN109342218A
CN109342218A CN201811477432.6A CN201811477432A CN109342218A CN 109342218 A CN109342218 A CN 109342218A CN 201811477432 A CN201811477432 A CN 201811477432A CN 109342218 A CN109342218 A CN 109342218A
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test
test specimen
foil gauge
specimen
cutting
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Inventor
张鹏
王娟
李清富
刘晨辉
焦美菊
郑元勋
张天航
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Zhengzhou University
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Zhengzhou University
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    • 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
    • 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
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • 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
    • G01N2001/2873—Cutting or cleaving
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0023—Bending
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0048—Hydraulic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0066—Propagation of crack
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0067—Fracture or rupture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0264—Beam
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/027—Specimens with holes or notches

Abstract

Present invention proposition Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method, comprising the following steps: proportioning test test specimen, measurement test specimen crack leading edge strain field, joint-cutting, benefit cut, paste foil gauge, strain acquirement instrument acquisition data, measurement beam specimen mid-span deflection δ, data acquisition, the load for measuring cement stabilized macadam test specimen and calculate fracture toughness；The present invention by using central sill test specimen as test specimen can reduce test result there is discreteness, by in the upper of testing machine, it can be with guarantee test machine rigidity during thering is stiff member to test between lower platen, avoid testing machine that the elastic deformation energy accumulated in testing machine body is released to test specimen in test specimen cracking, so that test specimen is broken immediately and can not measure fracture full curve after load reaches peak value, test result accuracy and with a high credibility, the production requirement tested to testing machine and test specimen can be reduced by carrying out test by three-point bending method, external influence factors are small.

Description

Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method
Technical field
The present invention relates to highway construction field more particularly to Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test sides Method.
Background technique
Cement stabilized macadam is to make aggregate with graded broken stone, using a certain number of cementitious materials and enough mortar volumes The gap of filler aggregate paves compacting by embedded squeezing principle, and compactness is close to compactness, and intensity is mainly by the embedded squeezing between rubble Lock knot principle, while the gap for having enough mortar volumes to carry out filler aggregate, its early strength is high, and intensity with age and Plate body, thus intensity with higher are formed in increase quickly, and impervious degree and frost resistance are preferable, and cement stabilized macadam meets rain after surviving Not muddy, surface is solid, is the ideal base material of high class pavement.
The fracture toughness of concrete be describe mechanical performance of concrete an important indicator, it be to concrete material into The important evidence of row fracture analysis reflects the ability of concrete resisting crack extending, existing for testing polypropylene fibre The method of cement stabilized macadam fracture property is right during the test since there is dimensional effects for the fracture toughness of fragile material In semi-rigid material, using its test result of girder test specimen, there is very big discretenesses, thus are broken as to semi-rigid material The trial of test, there is also shortcomings, while the best method of existing measurement cement stabilized macadam fragmentation parameters is uniaxial Uniaxial direct tensile method, but the method is very harsh to the production requirement of testing machine and test specimen, it is desirable that testing machine has very high rigid Degree, upper and lower fixture height centering, being also sized to for test specimen is very accurate, and the slightly worse machine of rigidity tends not to measure load-position The descending branch of curve is moved, so that energy to failure can not be calculated, and the size of or test specimen bad to the moderate production of fixture is inaccurate up and down Really it will lead to uniaxial direct tensile test specimen cross section under tension upper stress and be unevenly distributed, seriously affect the accuracy of test result and credible Degree.Therefore, the present invention propose Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method, with solve it is in the prior art not Foot place.
Summary of the invention
In view of the above-mentioned problems, the present invention by using central sill test specimen as test specimen can reduce test result there is Discreteness, by have between the upper and lower pressing plate of testing machine stiff member test during can be kept away with guarantee test machine rigidity Exempt from testing machine and the elastic deformation energy accumulated in testing machine body is released to test specimen in test specimen cracking, so that load reaches peak value Test specimen is broken immediately and can not measure fracture full curve afterwards, test result accuracy and with a high credibility.
The present invention proposes Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method, comprising the following steps:
Step 1: proportioning test test specimen
It matches out having a size of 100mm × 100mm × 515mm central sill test specimen, the notch relative depth a of test specimen0/ h is used 0.2m, i.e. notch depth are 20mm, and match ratio PPS00 and PPS06 respectively form 4 groups, match ratio PPS04-5, PPS08-5, PPS10-5, PPS06-4, PPS06-6 and PPS06-7 respectively form 1 group, every group of 4~6 test specimens；
Step 2: measurement test specimen crack leading edge strain field
Using electric resistance strain film method to Polypropylene Fiber Reinforced Cement Stabilized Macadam three point bending specimen crack leading edge strain field Variation measures, and using S2120-40AA type resistance strain gage, measurement gauge length is 4cm, and resistance value is 120 Ω；
Step 3: joint-cutting
Test specimen reaches test age a few days ago, and the test specimen for being used to carry out destructive test is taken out from fog room, into Row joint-cutting；
Step 4: benefit is cut
Whether three joint-cutting of above-mentioned steps with the depth of testing of steel tape joint-cutting is 2cm after terminating, if depth is inadequate, Mend and cut, test specimen is placed into a period of time after joint-cutting, etc. surface of test piece it is dry after carry out the stickup of foil gauge；
Step 5: foil gauge is pasted
First test specimen side is polished with sand paper, then wipes the aggregate chips that surface is left with acetone, is then answered with binder stickup Become piece；
Step 6: strain acquirement instrument acquires data
After the strain adhesive curing of foil gauge to be pasted, the lead of each foil gauge has been connect by electric wire with strain acquirement instrument Come, then the pre- joint-cutting top in test specimen side of position joint-cutting two sides and stickup foil gauge side is divided among the precutting of test specimen bottom Not with a pair of small iron block of 502 glues, it is respectively used to the folder of fixed test crack mouth opening displacement and crack tip opening displacement Formula tens(i)ometer；
Step 7: measurement beam specimen mid-span deflection δ
Beam specimen mid-span deflection δ is measured using dial gauge electrical measuring method, first consolidates dial gauge by the dial framework that angle bar makes It is scheduled on the side that test specimen does not paste foil gauge, a small sheet glass is pasted at the ipsilateral intermediate position in test specimen bottom, measures dial gauge End is pushed up on the glass sheet, on then testing machine support that test specimen is placed to the good height of formerly debugging and spacing, then puts load Sensor fixes clip tens(i)ometer, dial gauge is fixed on test specimen, and adjust the position of test specimen together with dial framework, makes hundred Cushion block on point table test cap, test specimen, load transducer, on load transducer the center of cushion block and testing machine top board with The precutting justified at position among test specimen；
Step 8: data acquisition
The data acquisition software on computer that is connected with automatic response Acquisition Instrument is opened, all data are soft by this in test Part automatic collection simultaneously stores, and opens data and acquires each channel, and is balanced to each initial reading, then opens testing machine and starts Test carries out data acquisition；
Step 9: the load of measurement cement stabilized macadam test specimen
Vertical load PV- δ, PV-CMOD and PV-CMOD curve can be measured simultaneously by dynamic X~Y function recording instrument, passed through Cross computer graphical processing software processing, obtained series polypropylenes fiber reinforced cement stable rubble PV- δ, PV-CMOD and PV-CMOD curve；
Step 10: fracture toughness is calculated
Fracture toughness is calculated according to formula (1) and (2)；
In formula (1) and (2), KICFor the fracture toughness of cement stabilized macadam, unit are as follows: kN/m3/2；MmaxFor maximum span centre Moment of flexure, unit are as follows: MPa；PmaxFor maximum vertical load, unit are as follows: kN；G is the weight for loading attachment, G=0.032kN；H,B, L is respectively height, width and the length of beam specimen, unit are as follows: m；A is the length in prefabricated crack, unit are as follows: m；It is WithThe related function of value, shown in expression formula such as formula (3), obtain fracture toughness.
Further improvement lies in that: match ratio PPS00 and PPS06 respectively form 4 groups in the step 1, every group of 4~6 examinations Part, is respectively used to test its 14 days, 28 days, 60 days, 90 days fragmentation parameters, match ratio PPS04-5, PPS08-5, PPS10-5, PPS06-4, PPS06-6 and PPS06-7 respectively form 1 group, every group of 4~6 test specimens, for testing its 60 days fragmentation parameters.
Further improvement lies in that: failed test piece and test operation are removed not in every group of 4~6 test specimens in the step 1 When and the test specimen that damages, guarantee that every group includes at least and have 4 test specimens completely tested, and the test specimen with optimum moisture content, Maximum dry density and 98% compactness hydrostatic profile.
Further improvement lies in that: first whether to be broken with general-purpose table look-up foil gauge before foil gauge use in the step 2 Or short circuit, and its resistance value is measured, the difference of foil gauge actual resistance and foil gauge nominal resistance value should be less than ± 0.5%, Then according to resistance value size packets, the identical foil gauge of each group of test specimen resistance value is tested.
Further improvement lies in that: routing positioning first is carried out to lancing location before joint-cutting in the step 3, first in test specimen Cutting line is marked with pencil in position among bottom surface, and the depth of cut of adjustment small-sized electric cutting machine-cut wheel is 2cm, is then cut Seam, joint-cutting notice that joint-cutting to be guaranteed cannot be bent.
Further improvement lies in that: binder is formed by epoxy resin and polyamide cure in the step 5, and the two is mixed It can be adjusted flexibly according to the cured time with ratio.
Further improvement lies in that: detailed process in the step 5 are as follows: first test specimen side is polished with sand paper, then uses acetone The aggregate chips that surface is left is wiped, binder is spread into very thin one at the position for pasting foil gauge with a relatively thin plastic plate Layer, range is more slightly larger than the size of foil gauge, then compares the label that pencil is made and pastes foil gauge, covers plastic foil row The bubble between foil gauge and test specimen is removed, is careful not to make two lead-out wires of foil gauge to stick together, to prevent foil gauge short circuit.
Further improvement lies in that: in the step 5 before pasting foil gauge, first with ruler by the position of strain gauge adhesion It determines, is marked position with pencil, draw first line perpendicular to the direction of seam on the pre- joint-cutting top in test specimen side, then up Successively every standardized parallel lines of 20cm.
Further improvement lies in that: it tests in the step step 8 and is carried out on 3000KN digital display hydraulic dynamometer, lotus The measuring range of set sensor is 0~30KN, has stiff member between the upper and lower pressing plate of testing machine.
Further improvement lies in that: loading speed is paid attention to when testing in the step 8, to be reduced when test specimen is close to be destroyed Loading velocity.
The invention has the benefit that by using central sill test specimen as test specimen can reduce test result there is Discreteness, by have between the upper and lower pressing plate of testing machine stiff member test during can be kept away with guarantee test machine rigidity Exempt from testing machine and the elastic deformation energy accumulated in testing machine body is released to test specimen in test specimen cracking, so that load reaches peak value Test specimen is broken immediately and can not measure fracture full curve afterwards, and test can be reduced to testing machine by carrying out test by three-point bending method With the production of test specimen requirement, while testing that process is easy to operate, and external influence factors are small, test result accuracy and confidence level Height can guarantee that test specimen has enough stiffness and strength by the test specimen of hydrostatic profile, further improve test result Accuracy.
Specific embodiment
In order to realize invention technological means, reach purpose and effect is easy to understand, below with reference to specific implementation Mode, the present invention is further explained.
The present embodiment proposes Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method, comprising the following steps:
Step 1: proportioning test test specimen
It matches out having a size of 100mm × 100mm × 515mm central sill test specimen, the notch relative depth a of test specimen0/ h is used 0.2m, i.e. notch depth are 20mm, and match ratio PPS00 and PPS06 respectively form 4 groups, and every group of 6 test specimens are respectively used to test it 14 days, 28 days, 60 days, 90 days fragmentation parameters, match ratio PPS04-5, PPS08-5, PPS10-5, PPS06-4, PPS06-6 and PPS06-7 respectively forms 1 group, and every group of 6 test specimens remove unqualified examination in every group of 6 test specimens for testing its 60 days fragmentation parameters Part and test operation is improper and the test specimen that damages guarantees that every group includes at least and have 4 test specimens completely tested, and the test specimen is equal With optimum moisture content, maximum dry density and 98% compactness hydrostatic profile；
Step 2: measurement test specimen crack leading edge strain field
Using electric resistance strain film method to Polypropylene Fiber Reinforced Cement Stabilized Macadam three point bending specimen crack leading edge strain field Variation measures, and using S2120-40AA type resistance strain gage, measurement gauge length is 4cm, and resistance value is 120 Ω, and foil gauge makes First whether to be broken with general-purpose table look-up foil gauge before or short circuit, and measure its resistance value, foil gauge actual resistance with answer The difference for becoming piece name resistance value should be less than ± 0.5%, then according to resistance value size packets, test each group of test specimen resistance value phase Same foil gauge；
Step 3: joint-cutting
Test specimen reaches test age a few days ago, and the test specimen for being used to carry out destructive test is taken out from fog room, into Row joint-cutting first carries out routing positioning to lancing location before joint-cutting, and first cutting line with pencil is marked in position among the bottom surface of test specimen, The depth of cut for adjusting small-sized electric cutting machine-cut wheel is 2cm, then carries out joint-cutting, joint-cutting notices that joint-cutting to be guaranteed cannot be curved It is bent；
Step 4: benefit is cut
Whether three joint-cutting of above-mentioned steps with the depth of testing of steel tape joint-cutting is 2cm after terminating, if depth is inadequate, Mend and cut, test specimen is placed into a period of time after joint-cutting, etc. surface of test piece it is dry after carry out the stickup of foil gauge；
Step 5: foil gauge is pasted
First test specimen side is polished with sand paper, then wipes the aggregate chips that surface is left with acetone, is then answered with binder stickup Becoming piece, binder is formed by epoxy resin and polyamide cure, and the mixture proportion of the two can be adjusted flexibly according to the cured time, First test specimen side is polished with sand paper, then wipes the aggregate chips that surface is left with acetone, by one relatively thin plastic plate of binder Very thin one layer is spread at the position for pasting foil gauge, range is more slightly larger than the size of foil gauge, then compares pencil and does Label out pastes foil gauge, covers the bubble between plastic foil venting foil gauge and test specimen, is careful not to make foil gauge two A lead-out wire sticks together, and to prevent foil gauge short circuit, before pasting foil gauge, is first determined the position of strain gauge adhesion with ruler Out, position is marked with pencil, draws first line perpendicular to the direction of seam on the pre- joint-cutting top in test specimen side, then up successively Every standardized parallel lines of 20cm；
Step 6: strain acquirement instrument acquires data
After the strain adhesive curing of foil gauge to be pasted, the lead of each foil gauge has been connect by electric wire with strain acquirement instrument Come, then the pre- joint-cutting top in test specimen side of position joint-cutting two sides and stickup foil gauge side is divided among the precutting of test specimen bottom Not with a pair of small iron block of 502 glues, it is respectively used to the folder of fixed test crack mouth opening displacement and crack tip opening displacement Formula tens(i)ometer；
Step 7: measurement beam specimen mid-span deflection δ
Beam specimen mid-span deflection δ is measured using dial gauge electrical measuring method, first consolidates dial gauge by the dial framework that angle bar makes It is scheduled on the side that test specimen does not paste foil gauge, a small sheet glass is pasted at the ipsilateral intermediate position in test specimen bottom, measures dial gauge End is pushed up on the glass sheet, on then testing machine support that test specimen is placed to the good height of formerly debugging and spacing, then puts load Sensor fixes clip tens(i)ometer, dial gauge is fixed on test specimen, and adjust the position of test specimen together with dial framework, makes hundred Cushion block on point table test cap, test specimen, load transducer, on load transducer the center of cushion block and testing machine top board with The precutting justified at position among test specimen；
Step 8: data acquisition
The data acquisition software on computer that is connected with automatic response Acquisition Instrument is opened, all data are soft by this in test Part automatic collection simultaneously stores, and opens data and acquires each channel, and is balanced to each initial reading, then opens testing machine and starts Test carries out data acquisition, and test carries out on 3000KN digital display hydraulic dynamometer, and the measurement of load transducer is 20KN, There is stiff member between the upper and lower pressing plate of testing machine, when test pays attention to loading speed, when test specimen is close to will reduce load when destroying Speed；
Step 9: the load of measurement cement stabilized macadam test specimen
Vertical load PV- δ, PV-CMOD and PV-CMOD curve can be measured simultaneously by dynamic X~Y function recording instrument, passed through Cross computer graphical processing software processing, obtained series polypropylenes fiber reinforced cement stable rubble PV- δ, PV-CMOD and PV-CMOD curve；
Step 10: fracture toughness is calculated
Fracture toughness is calculated according to formula (1) and (2)；
In formula (1) and (2), KICFor the fracture toughness of cement stabilized macadam, unit are as follows: kN/m3/2；MmaxFor maximum span centre Moment of flexure, unit are as follows: MPa；PmaxFor maximum vertical load, unit are as follows: kN；G is the weight for loading attachment, G=0.032kN；H,B, L is respectively height, width and the length of beam specimen, unit are as follows: m；A is the length in prefabricated crack, unit are as follows: m；It is WithThe related function of value, shown in expression formula such as formula (3), obtain fracture toughness.
By using central sill test specimen as test specimen can reduce test result there is discreteness, by testing Testing machine can be avoided to crack in test specimen with guarantee test machine rigidity during thering is stiff member to test between the upper and lower pressing plate of machine When the elastic deformation energy accumulated in testing machine body is released to test specimen so that test specimen is broken and nothing immediately after load reaches peak value Method measurement fracture full curve, the production requirement tested to testing machine and test specimen can be reduced by carrying out test by three-point bending method, Test that process is easy to operate, and external influence factors are small simultaneously, test result accuracy and with a high credibility passes through the examination of hydrostatic profile Part can guarantee that test specimen has enough stiffness and strength, further improve the accuracy of test result.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle It is fixed.

Claims (10)

1. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method, it is characterised in that: the following steps are included:
Step 1: proportioning test test specimen
It matches out having a size of 100mm × 100mm × 515mm central sill test specimen, the notch relative depth a of test specimen0/ h uses 0.2m, I.e. notch depth is 20mm, and match ratio PPS00 and PPS06 respectively form 4 groups, match ratio PPS04-5, PPS08-5, PPS10-5, PPS06-4, PPS06-6 and PPS06-7 respectively form 1 group, every group of 4~6 test specimens；
Step 2: measurement test specimen crack leading edge strain field
Variation using electric resistance strain film method to Polypropylene Fiber Reinforced Cement Stabilized Macadam three point bending specimen crack leading edge strain field It measures, using S2120-40AA type resistance strain gage, measurement gauge length is 4cm, and resistance value is 120 Ω；
Step 3: joint-cutting
Test specimen reaches test age a few days ago, and the test specimen for being used to carry out destructive test is taken out from fog room, is cut Seam；
Step 4: benefit is cut
Whether three joint-cutting of above-mentioned steps with the depth of testing of steel tape joint-cutting is 2cm after terminating, be into if depth is inadequate Row is mended and is cut, and test specimen is placed a period of time after joint-cutting, etc. surface of test piece it is dry after carry out the stickup of foil gauge；
Step 5: foil gauge is pasted
First test specimen side is polished with sand paper, then wipes the aggregate chips that surface is left with acetone, then pastes foil gauge with binder；
Step 6: strain acquirement instrument acquires data
After the strain adhesive curing of foil gauge to be pasted, the lead of each foil gauge is connected by electric wire and strain acquirement instrument, Then the pre- joint-cutting top difference in the test specimen side of position joint-cutting two sides and stickup foil gauge side among the precutting of test specimen bottom With a pair of small iron block of 502 glues, it is respectively used to the clip of fixed test crack mouth opening displacement and crack tip opening displacement Tens(i)ometer；
Step 7: measurement beam specimen mid-span deflection δ
Beam specimen mid-span deflection δ is measured using dial gauge electrical measuring method, is first fixed on dial gauge by the dial framework that angle bar makes Test specimen does not paste the side of foil gauge, pastes a small sheet glass at the ipsilateral intermediate position in test specimen bottom, dial gauge is made to measure end On the glass sheet, on then testing machine support that test specimen is placed to the good height of formerly debugging and spacing, then put load sensing in top Device fixes clip tens(i)ometer, dial gauge is fixed on test specimen, and adjust the position of test specimen together with dial framework, makes dial gauge Cushion block on test cap, test specimen, load transducer, the center of cushion block and testing machine top board is and test specimen on load transducer The precutting justified at intermediate position；
Step 8: data acquisition
The data acquisition software on computer that is connected with automatic response Acquisition Instrument is opened, all data pass through the software certainly in test It is dynamic to acquire and store, it opens data and acquires each channel, and each initial reading is balanced, then open testing machine and start to try It tests, carries out data acquisition；
Step 9: the load of measurement cement stabilized macadam test specimen
Vertical load PV- δ, PV-CMOD and PV-CMOD curve can be measured simultaneously by dynamic X~Y function recording instrument, by meter The processing of calculation machine PaintShop, has obtained PV- δ, PV-CMOD and PV- of series polypropylenes fiber reinforced cement stable rubble CMOD curve；
Step 10: fracture toughness is calculated
Fracture toughness is calculated according to formula (1) and (2)；
In formula (1) and (2), KICFor the fracture toughness of cement stabilized macadam, unit are as follows: kN/m3/2；MmaxIt is curved for maximum span centre Square, unit are as follows: MPa；PmaxFor maximum vertical load, unit are as follows: kN；G is the weight for loading attachment, G=0.032kN；H,B,L The respectively height of beam specimen, width and length, unit are as follows: m；A is the length in prefabricated crack, unit are as follows: m；Be withThe related function of value, shown in expression formula such as formula (3), obtain fracture toughness.
2. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method according to claim 1, it is characterised in that: institute State match ratio PPS00 and PPS06 in step 1 and respectively form 4 groups, every group of 4~6 test specimens, be respectively used to test its 14 days, 28 days, 60 days, 90 days fragmentation parameters, match ratio PPS04-5, PPS08-5, PPS10-5, PPS06-4, PPS06-6 and PPS06-7 respectively at 1 group of type, every group of 4~6 test specimens, for testing its 60 days fragmentation parameters.
3. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method according to claim 1, it is characterised in that: institute State in step 1 and to remove failed test piece in every group of 4~6 test specimens and test operation is improper and the test specimen that damages, guarantee every group extremely Less include 4 test specimens completely tested, and the test specimen with optimum moisture content, maximum dry density and 98% compactness it is quiet It is molded.
4. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method according to claim 1, it is characterised in that: institute Whether will first with general-purpose table look-up foil gauge be broken or short circuit, and measure its resistance value if stating in step 2 before foil gauge use, be answered The difference for becoming piece actual resistance and foil gauge nominal resistance value should be less than ± 0.5%, then according to resistance value size packets, test The identical foil gauge of each group of test specimen resistance value.
5. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method according to claim 1, it is characterised in that: institute It states in step 3 and routing positioning first is carried out to lancing location before joint-cutting, cutting is marked with pencil in the first position among the bottom surface of test specimen The depth of cut of line, adjustment small-sized electric cutting machine-cut wheel is 2cm, then carries out joint-cutting, joint-cutting notices that joint-cutting to be guaranteed cannot Bending.
6. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method according to claim 1, it is characterised in that: institute It states binder in step 5 to be formed by epoxy resin and polyamide cure, the mixture proportion of the two can be flexible according to the cured time Adjustment.
7. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method according to claim 1, it is characterised in that: institute State detailed process in step 5 are as follows: first test specimen side is polished with sand paper, then wipes the aggregate chips that surface is left with acetone, will be bonded Agent spreads very thin one layer at the position for pasting foil gauge with a relatively thin plastic plate, and range is slightly bigger than the size of foil gauge It is some, it then compares the label that pencil is made and pastes foil gauge, cover the bubble between plastic foil venting foil gauge and test specimen, infuse Meaning not make two lead-out wires of foil gauge stick together, to prevent foil gauge short circuit.
8. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method according to claim 7, it is characterised in that: institute It states in step 5 before pasting foil gauge, is first determined the position of strain gauge adhesion with ruler, marked position with pencil, First line is drawn perpendicular to the direction of seam in the pre- joint-cutting top in test specimen side, then up successively every standardized parallel lines of 20cm.
9. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method according to claim 1, it is characterised in that: institute It states to test in step step 8 and be carried out on 3000KN digital display hydraulic dynamometer, the measuring range of load transducer is 0~ 30KN has stiff member between the upper and lower pressing plate of testing machine.
10. Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method according to claim 1, it is characterised in that: Loading speed is paid attention to when testing in the step 8, to reduce loading velocity when test specimen is close to be destroyed.
CN201811477432.6A 2018-12-05 2018-12-05 Polypropylene Fiber Reinforced Cement Stabilized Macadam fracture property test method Pending CN109342218A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110220803A (en) * 2019-07-16 2019-09-10 长沙理工大学 Consider the cement stabilized macadam bending tensile strength test mode of tension and compression modulus difference
CN111504817A (en) * 2020-04-20 2020-08-07 哈尔滨工程大学 Steel fracture strain testing device under explosive load and testing method thereof
CN112304860A (en) * 2020-12-15 2021-02-02 核工业理化工程研究院 Device and method for testing fiber stiffness

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110220803A (en) * 2019-07-16 2019-09-10 长沙理工大学 Consider the cement stabilized macadam bending tensile strength test mode of tension and compression modulus difference
CN111504817A (en) * 2020-04-20 2020-08-07 哈尔滨工程大学 Steel fracture strain testing device under explosive load and testing method thereof
CN111504817B (en) * 2020-04-20 2022-08-02 哈尔滨工程大学 Steel fracture strain testing device under explosive load and testing method thereof
CN112304860A (en) * 2020-12-15 2021-02-02 核工业理化工程研究院 Device and method for testing fiber stiffness

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Application publication date: 20190215