CN105372133A - Method for testing anti-cracking performance of asphalt binder - Google Patents
Method for testing anti-cracking performance of asphalt binder Download PDFInfo
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- CN105372133A CN105372133A CN201510870812.6A CN201510870812A CN105372133A CN 105372133 A CN105372133 A CN 105372133A CN 201510870812 A CN201510870812 A CN 201510870812A CN 105372133 A CN105372133 A CN 105372133A
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Abstract
The invention relates to a method for testing anti-cracking performance of an asphalt binder. A gap is processed on the center of a simulation sample; load is applied on the center of the sample, and a displacement sensor and a stress force sensor are used for real-time detection of the load and mid-span deflection; and according to a load-mid-span deflection curve, fracture energy Gf of the asphalt binder is calculated. The experiment method of the invention has the advantages of simple and cheap equipment, simple test process, stable and reliable test results; and fracture energy can accurately evaluate the states of crack initiation and propagation.
Description
Technical field
The present invention relates to the Performance Evaluation Technique field of asphaltic binder, be specifically related to a kind of method of testing asphaltic binder cracking resistance.
Background technology
Most pavement disease (longitudinal crack, Thermal cracking crack, reflection crack) is all relevant with the fracture property of pitch.The existence of asphalt material Fracture performance affects the service level on road surface significantly.
After road surface cracking, the stress at the crack tip place that the traffic loading of repetition produces under the effect of various factors is concentrated, and causes the cracking on surface.Destroy globality and the continuity of structure on the one hand, further developing of crack can be impelled on the other hand.
Propose in Superpave (high performance asphalt pavement) bituminous cements specification to adopt bending mechanical properties method (BBR) to test pitch bending creep stiffness S and m value to evaluate the cracking resistance of asphaltic binder.But the cracking resistance of BBR method test asphaltic binder low temperature, can not illustrate crackle how to germinate the rule with Crack Extension.BBR can accurately not characterize the cracking resistance of asphaltic binder.
Therefore, how to set up new index by new experimental technique, with the cracking resistance reasonably evaluating asphaltic binder, there is important Research Significance.
Summary of the invention
The object of this invention is to provide a kind of by testing the load of asphaltic binder and mid-span deflection, and method of testing is simple, the method for the test asphaltic binder cracking resistance of reliable results.
To achieve these goals, the technical solution adopted in the present invention is made up of following steps:
(1) tested asphaltic binder is prepared into rectangular parallelepiped sample, at the one-sided marginal center processing otch of rectangular parallelepiped sample, after the demoulding, in 0 ~ 60 DEG C, constant temperature keeps 60 ± 5min;
(2) in the otch of sample, displacement transducer is provided with, the opposite side utilizing the middle part of hydraulic loading device to sample relative with otch applies load, loading speed is 0.5 ~ 2mm/min, be arranged on the strain gauge Real-time Collection load at sample load(ing) point place, and sent to computing machine, simultaneous displacement sensor Real-time Collection mid-span deflection sends computing machine to, until sample fracture into two;
(3) load that records according to step (2) of computing machine and mid-span deflection, take mid-span deflection as transverse axis, load is the longitudinal axis, make He Zai ?mid-span deflection curve, calculate mid-span deflection from 0 to CTOD interval with He Zai ?the area that surrounds across kind of sag curve be the energy to failure G of this asphaltic binder
f, computing formula is as follows:
Wherein: P is load, MPa;
CTOD is mid-span deflection, mm;
G
ffor energy to failure, KJ;
Thus determine the cracking resistance of this asphaltic binder.
The cross section of above-mentioned otch is isosceles triangle, and drift angle is 58 ~ 62 °, meets: a/w≤1/10 between the degree of depth a of otch and specimen height w.
The method of test asphaltic binder cracking resistance provided by the invention, at the middle part machining gap of simulation sample, can in real time detect its load and mid-span deflection to load application in the middle part of sample by displacement transducer and strain gauge by means of experimental facilitiess such as BBR, according to He Zai ?mid-span deflection opisometer calculate the energy to failure G of asphaltic binder
f, and propose the cracking resistance of energy at yield index to asphaltic binder and evaluate, this experimental technique equipment needed thereby simple cheap, simple testing process is easy, and test result is reliable and stable, takes energy to failure can evaluate germinating and the spread scenarios in crack accurately.
Accompanying drawing explanation
Fig. 1 is asphaltic binder specimen cross section schematic diagram.
Fig. 2 be He Zai ?across kind of a sag curve.
Fig. 3 is the matched curve of the stiffness modulus of experiment one energy to failure and experiment two.
Embodiment
Now in conjunction with the accompanying drawings and embodiments technical scheme of the present invention is further described.
Embodiment 1
The test of the present embodiment realizes by means of bent beam creep test instrument (BBR), and the method for concrete test asphaltic binder cracking resistance is made up of following steps:
(1) after asphaltic binder to be tested being slowly heated to flow state, pour die for molding into, cool under mould being placed in after having built room temperature, when reaching demoulding condition, mould of dismantling, is therefrom shifted out test specimen, obtain the rectangular parallelepiped sample that one-sided marginal center is processed with otch, as shown in Figure 1, after the demoulding, sample is put into the thermostatic bath reaching experimental temperature, in 45 DEG C, constant temperature keeps 60min.
In order to ensure experimental result simulation accurately, the cross section of otch is processed as the isosceles triangle that drift angle is 60 °, meets: a/w=1/12 between the degree of depth a of otch and the height w of sample.
(2) utilize bent beam creep test instrument to carry out single edges to sample and bend rheological experiment, displacement transducer is provided with in the otch of sample, the opposite side utilizing the middle part of hydraulic loading device to sample relative with otch applies load, loading speed is 1mm/min, be arranged on the strain gauge Real-time Collection load at sample load(ing) point place, and sent to computing machine, simultaneous displacement sensor Real-time Collection mid-span deflection sends computing machine to, transmission interval time of strain gauge and displacement transducer is 0.3s, and measuring accuracy is 99%, until sample fracture into two.
(3) load that records according to step (2) of computing machine and mid-span deflection, take mid-span deflection as transverse axis, load is the longitudinal axis, draw He Zai ?mid-span deflection curve, as Fig. 2, calculate mid-span deflection from 0 to CTOD interval with He Zai ?the area that surrounds across kind of sag curve be the energy to failure G of this asphaltic binder
f, computing formula is as follows:
Wherein: P is load, MPa;
CTOD is mid-span deflection, mm;
G
ffor energy to failure, KJ;
Thus determine the cracking resistance of this asphaltic binder.
Embodiment 2
In the present embodiment, step (1) is after asphaltic binder to be tested is slowly heated to flow state, pour die for molding into, cool under mould being placed in after having built room temperature, when reaching demoulding condition, mould of dismantling, test specimen is therefrom shifted out, obtain the rectangular parallelepiped sample that one-sided marginal center is processed with otch, after the demoulding, sample is put into the thermostatic bath reaching experimental temperature, in 0 DEG C, constant temperature keeps 65min; In the present embodiment, the cross section of otch is processed as the isosceles triangle that drift angle is 58 °, meets: a/w=1/10 between the degree of depth a of otch and the height w of sample.
Step (2) is: utilize bent beam creep test instrument to carry out single edges to sample and bend rheological experiment, displacement transducer is provided with in the otch of sample, the opposite side utilizing the middle part of hydraulic loading device to sample relative with otch applies load, loading speed is 0.5mm/min, be arranged on the strain gauge Real-time Collection load at sample load(ing) point place, and sent to computing machine, simultaneous displacement sensor Real-time Collection mid-span deflection sends computing machine to, transmission interval time of strain gauge and displacement transducer is 0.5s, and measuring accuracy is 99%, until sample fracture into two,
Other step is identical with embodiment 1.
Embodiment 3
The step (1) of the present embodiment is after asphaltic binder to be tested is slowly heated to flow state, pour die for molding into, cool under mould being placed in after having built room temperature, when reaching demoulding condition, to dismantle mould, test specimen is therefrom shifted out, obtains the rectangular parallelepiped sample that one-sided marginal center is processed with otch, after the demoulding, sample is put into the thermostatic bath reaching experimental temperature, in 60 DEG C, constant temperature keeps 55min.The cross section of otch is processed as the isosceles triangle that drift angle is 62 °, meets: a/w=1/15 between the degree of depth a of otch and the height w of sample.
Step (2) utilizes bent beam creep test instrument to carry out single edges to sample to bend rheological experiment, displacement transducer is provided with in the otch of sample, the opposite side utilizing the middle part of hydraulic loading device to sample relative with otch applies load, loading speed is 2mm/min, be arranged on the strain gauge Real-time Collection load at sample load(ing) point place, and sent to computing machine, simultaneous displacement sensor Real-time Collection mid-span deflection sends computing machine to, transmission interval time of strain gauge and displacement transducer is 0.3s, and measuring accuracy is 99%, until sample fracture into two.
Other step is identical with embodiment 1.
Method of testing of the present invention is not limited only to bent beam creep test instrument (BBR), as long as other instruments that can realize load and mid-span deflection all can be applicable to the detection realizing asphaltic binder energy to failure in method of testing of the present invention.
In order to verify technique effect of the present invention, following 5 kinds of following method of testings of asphaltic binder tested respectively its cracking resistance, the basic technical indicator of each asphaltic binder is as shown in table 1.
Table 1 is the basic technical indicator of 5 kinds of asphaltic binders
Method of testing is as follows respectively:
Method one: utilize the method for embodiment 1 to test the energy to failure of each sample pitch to 5 kinds of experiment asphaltic binders.
Method two: adopt five kinds of sample pitches, according to AC ?20 collection join match ratio configuration asphalt and carry out fail in bending test, grating in table 2, experimental temperature Wei ?15 DEG C, loading speed is 5mm/min, obtains breakdown strength, destroys tensile strain and stiffness modulus.
Table 2AC ?20 grating match ratios
| Sieve aperture (mm) | 26.5 | 19 | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Formate gradation composition | 100 | 98.8 | 89.0 | 74.9 | 64.3 | 45.4 | 27.4 | 17.7 | 12.8 | 9.1 | 7.2 | 5.2 |
| The grating upper limit | 100 | 100 | 92 | 80 | 72 | 56 | 44 | 33 | 24 | 17 | 13 | 7 |
| Grating lower limit | 100 | 90 | 78 | 62 | 50 | 26 | 16 | 12 | 8 | 5 | 4 | 3 |
According to method of testing one and two, carry out correlation analysis to the stiffness modulus data of the test energy to failure of asphaltic binder and the crooked experiment of asphalt, the following Fig. 3 display of Regression Analysis Result, from interpretation of result, R=0.99157, there is good correlativity in both.
Can find out by experiment, the energy to failure of asphaltic binder using this method to record and the three-point bending stiffness modulus of asphalt have good correlativity, adopt the energy to failure method of testing of asphaltic binder better can evaluate the cracking resistance of asphaltic binder.
Claims (2)
1. test a method for asphaltic binder cracking resistance, it is characterized in that being made up of following steps:
(1) tested asphaltic binder is prepared into rectangular parallelepiped sample, at the one-sided marginal center processing otch of rectangular parallelepiped sample, after the demoulding, in 0 ~ 60 DEG C, constant temperature keeps 60 ± 5min;
(2) in the otch of sample, displacement transducer is provided with, the opposite side utilizing the middle part of hydraulic loading device to sample relative with otch applies load, loading speed is 0.5 ~ 2mm/min, be arranged on the strain gauge Real-time Collection load at sample load(ing) point place, and sent to computing machine, simultaneous displacement sensor Real-time Collection mid-span deflection sends computing machine to, until sample fracture into two;
(3) load that records according to step (2) of computing machine and mid-span deflection, take mid-span deflection as transverse axis, load is the longitudinal axis, make He Zai ?mid-span deflection curve, calculate mid-span deflection from 0 to CTOD interval with He Zai ?the area that surrounds across kind of sag curve be the energy to failure G of this asphaltic binder
f, computing formula is as follows:
Wherein: P is load, MPa;
CTOD is mid-span deflection, mm;
G
ffor energy to failure, KJ;
Thus determine the cracking resistance of this asphaltic binder.
2. test the method for asphaltic binder cracking resistance according to claim 1, it is characterized in that: the cross section of described otch is isosceles triangle, and drift angle is 58 ~ 62 °, meet between the degree of depth a of otch and specimen height w: a/w≤1/10.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627402A (en) * | 2018-05-09 | 2018-10-09 | 哈尔滨工业大学 | A kind of test equipment and method of analysis pitch freezing crack performance |
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| CN203616212U (en) * | 2013-12-16 | 2014-05-28 | 长安大学 | Rheology tester for asphalt binder |
| CN103964795A (en) * | 2014-03-04 | 2014-08-06 | 杭州固华复合材料科技有限公司 | Reinforced cement based composite material with fiber woven mesh and preparation method of reinforced cement based composite material |
| KR20140126650A (en) * | 2013-04-23 | 2014-10-31 | 대우조선해양 주식회사 | Test Apparatus and Method for Drilling Equipment |
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- 2015-12-01 CN CN201510870812.6A patent/CN105372133A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608905A (en) * | 2009-07-21 | 2009-12-23 | 清华大学 | A kind of measuring method of little opening displacement of microcrack |
| CN102109441A (en) * | 2010-12-21 | 2011-06-29 | 东南大学 | Method for evaluating low-temperature crack-resisting performance of asphalt mixture |
| CN103792132A (en) * | 2012-10-29 | 2014-05-14 | 中国石油化工股份有限公司 | Surfactant composition, its application and point load performance evaluating method |
| KR20140126650A (en) * | 2013-04-23 | 2014-10-31 | 대우조선해양 주식회사 | Test Apparatus and Method for Drilling Equipment |
| CN103258122A (en) * | 2013-04-25 | 2013-08-21 | 长安大学 | Rapid assessment method for PSC simply-supporting T-beam bridge carrying capacity based on fracture height |
| CN203616212U (en) * | 2013-12-16 | 2014-05-28 | 长安大学 | Rheology tester for asphalt binder |
| CN103964795A (en) * | 2014-03-04 | 2014-08-06 | 杭州固华复合材料科技有限公司 | Reinforced cement based composite material with fiber woven mesh and preparation method of reinforced cement based composite material |
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| CN108627402A (en) * | 2018-05-09 | 2018-10-09 | 哈尔滨工业大学 | A kind of test equipment and method of analysis pitch freezing crack performance |
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Application publication date: 20160302 |