CN103115827A - Method for testing repeated loading four-point stiffness modulus of asphalt mixture - Google Patents
Method for testing repeated loading four-point stiffness modulus of asphalt mixture Download PDFInfo
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- CN103115827A CN103115827A CN2013100527960A CN201310052796A CN103115827A CN 103115827 A CN103115827 A CN 103115827A CN 2013100527960 A CN2013100527960 A CN 2013100527960A CN 201310052796 A CN201310052796 A CN 201310052796A CN 103115827 A CN103115827 A CN 103115827A
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Abstract
The invention discloses a method for testing the repeated loading four-point stiffness modulus of asphalt mixture, belonging to the field of road engineering. The method is characterized in that the difference between the maximal deflection and the minimal deflection of a neutral surface within the scope of 1/3 span of the middle of a test part is measured during the repeated action of a four-point bending load, and the maximal tensile strain of the test part is calculated on the basis, and the actual bending stiffness modulus of the test part under the action of each load and the bending stiffness modulus delay rule of the test part under the action of the four-point bending repeated loading are further calculated. The stiffness modulus testing method overcomes the defects that just the average bending stiffness modulus of the entire test is obtained according to the prior art, the accurate and reliable four-point bending stiffness module of asphalt mixture based on repeated loading and the actual decay rule of the bending stiffness modulus of asphalt mixture under the action of repeated loading can be obtained according to the method, and the method has good popularization and application value.
Description
Technical field
The present invention relates to the road engineering field, specifically a kind of asphalt repeated load four-point bending stiffness modulus method of testing.
Background technology
In the fatigue behaviour of asphalt is estimated, Experimental Method in Laboratory commonly used is the torture test of asphalt four-point bending, and the bending stifiness modulus that the end condition of torture test is test specimen decays to 50% of initial value, if can not accurately obtain the bending stifiness modulus of test specimen under four-point bending load repeat function, will have influence on the accuracy of the evaluation of fatigue performance of asphalt mixture.Traditional asphalt four-point bending torture test is in the test of test specimen bending stifiness modulus, the bending stifiness modulus of supposing whole test specimen under the load repeat function equates all the time, measure whole test specimen maximum defluxion in process of the test poor, and the average bending stifiness modulus of the whole test specimen that will calculate on this basis is as the bending stifiness modulus of moment of flexure maximum region in test specimen.Obviously, this method is irrational.Test specimen middle part 1/3 across moment of flexure in the scope of footpath maximum and equate all the time namely should the zone in tension maximum and equate all the time, so this region material bending stifiness modulus is along with load repeat function decay amount is maximum and identical, the bending stifiness modulus of this region material is less than the average bending stifiness modulus of whole test specimen, and namely the bending stifiness modulus actual attenuation speed of test specimen is faster than classic method.Therefore, the method for testing of existing asphalt bending stifiness modulus has influence on the accuracy that fatigue performance of asphalt mixture is estimated.
Summary of the invention
Technical assignment of the present invention is for above-mentioned the deficiencies in the prior art, and a kind of asphalt repeated load four-point bending stiffness modulus method of testing is provided.Utilize the method can obtain the actual Decay Law of asphalt repeated load four-point bending stiffness modulus and asphalt bending stifiness modulus under Repeated Loading accurately and reliably.
Technical assignment of the present invention is realized in the following manner: asphalt repeated load four-point bending stiffness modulus method of testing, be characterized in four-point bending load repeat function process, measure the poor of maximum defluxion that test specimen middle part 1/3 produces across the neutral surface in the scope of footpath and minimum amount of deflection under each load action, and calculate on this basis the maximum stretching strain of test specimen, further calculate actual flexion stiffness modulus and the bending stifiness modulus Decay Law of test specimen under the four-point bending Repeated Loading of test specimen under load action each time.
Preferably utilize the poor of maximum defluxion that LVDT sensor measurement test specimen middle part 1/3 produces across the neutral surface in the scope of footpath and minimum amount of deflection under each load action.
Be the zone that test specimen flexural tensile stress maximum and material modulus equate for the test specimen that guarantees to survey is poor at the maximum defluxion under load action, the preferred following specific implementation step of said method:
1) LVDT installation of sensors
1/3 installs the LVDT sensor across the place, footpath in the middle part of the asphalt beam type test specimen for preparing;
2) the four-point bending reloading applies
According to test request, begin to load after setting load control mode, loading waveform, frequency;
3) experimental data processing
The peak load that at every turn applies that collects by collecting device and the maximum defluxion that test specimen produces under load action are poor, calculate the bending stifiness modulus of asphalt test specimen under each four-point bending load action and analyze the Decay Law of test specimen bending stifiness modulus in four-point bending Repeated Loading process.
When the LVDT sensor was installed step 1), the support that LVDT is installed was by sticking on beam type test specimen middle part 1/3 across being bolted on test specimen on place, footpath neutral surface; The sheet metal that contacts with the gauge head of LVDT is bolted on test specimen by two on the neutral surface that sticks on the test specimen span centre.
Asphalt repeated load four-point bending stiffness modulus method of testing of the present invention compared with prior art has following outstanding beneficial effect:
(1) the method is according to choosing the test section as test specimen stiffness modulus under the four-point bending Repeated Loading, zone that flexural tensile stress maximum in test specimen and material modulus equate all the time, can obtain actual flexion stiffness modulus and the Decay Law thereof of test specimen under the four-point bending Repeated Loading, overcome in prior art false whole test specimen material modulus under Repeated Loading identical all the time, can only obtain the defective of the average bending stifiness modulus of whole test specimen;
(2) the method has solved the inaccurate problem of fatigure failure limit judgement in existing asphalt mixture fatigue testing.
Description of drawings
Accompanying drawing 1 is force diagram and the moment curve of test specimen under the four-point bending load action in embodiment;
Accompanying drawing 2 is LVDT installations diagram of test specimen in embodiment;
Accompanying drawing 3 is embodiment Asphalt Mixture test specimen repeated load four-point bending stiffness modulus and the relation curve that loads number of times.
Mark in accompanying drawing represents respectively:
1. test specimen; 2.LVDT sensor; 3.LVDT mounting bracket; 4. with LVDT gauge head contacting metal plate; 5, the set bolt of 6.LVDT mounting bracket; 7. with the set bolt of LVDT gauge head contacting metal plate.
Embodiment
Asphalt repeated load four-point bending stiffness modulus method of testing of the present invention is described in detail below with specific embodiment with reference to Figure of description.
Embodiment
4 method for testing fatigue of asphalt repeated load of the present invention comprise the following steps (take middle grain formula bituminous concrete AC-25 as example):
A) LVDT installation of sensors
LVDT sensor 2 is installed across the place, footpath in middle part 1/3 at the asphalt beam type test specimen 1 for preparing.
As shown in Figure 2, the support 3 of LVDT sensor 2 being installed is by sticking on beam type test specimen middle part 1/3 across set bolt 5,6(A, A ' 2 points on place, footpath neutral surface) be fixed on test specimen 1; The sheet metal 4 that contacts with the gauge head of LVDT sensor 2 is by the set bolt 7(B point on the neutral surface that sticks on the test specimen span centre) be fixed on test specimen 1.
The preparation method of test specimen 1 is known technology.
B) the four-point bending reloading applies
According to test request, begin to load after setting load control mode, loading waveform, frequency.What this test was adopted is control strain method, has adopted altogether 70 μ ε, 100 μ ε, 200 μ ε, 300 μ ε totally 4 strain levels, and the loading waveform is half-sine wave, and loading frequency is 10Hz.Stressed and the moment of flexure of test specimen as shown in Figure 1.
C) experimental data processing
The peak load that at every turn applies that collects by collecting device and the maximum defluxion that test specimen produces under load action are poor
Then through type (1) calculates the maximum stretching strain in test specimen bottom surface, the bending stifiness modulus of last through type (2) calculation testing piece under each load action, by the stiffness modulus data and loading number of times that obtain repeating repeated loading, employing excel software can draw the Decay Law of test specimen bending stifiness modulus in four-point bending Repeated Loading process, as shown in Figure 3.
Formula (2)
In formula:
The maximum stretching strain in=test specimen bottom surface;
The height of h=test specimen (m);
The spacing of n=standing screw (m), the i.e. spacing of 2 of A, A ';
The peak load that P=applies (N);
The L=test specimen across footpath (m);
E=bending stifiness modulus (N/m
2);
The width of b=test specimen (m).
Claims (4)
1. asphalt repeated load four-point bending stiffness modulus method of testing is characterized in that:
In four-point bending load repeat function process, measure the poor of maximum defluxion that test specimen middle part 1/3 produces across the neutral surface in the scope of footpath and minimum amount of deflection under each load action, and calculate on this basis the maximum stretching strain of test specimen, further calculate actual flexion stiffness modulus and the bending stifiness modulus Decay Law of test specimen under the four-point bending Repeated Loading of test specimen under load action each time.
2. asphalt repeated load four-point bending stiffness modulus method of testing according to claim 1 is characterized in that: utilize the poor of maximum defluxion that LVDT sensor measurement test specimen middle part 1/3 produces under each load action across the neutral surface in the scope of footpath and minimum amount of deflection.
3. asphalt repeated load four-point bending stiffness modulus method of testing according to claim 2 is characterized in that comprising the following steps:
1) LVDT installation of sensors
1/3 installs the LVDT sensor across the place, footpath in the middle part of the asphalt beam type test specimen for preparing;
2) the four-point bending reloading applies
According to test request, begin to load after setting load control mode, loading waveform, frequency;
3) experimental data processing
The peak load that at every turn applies that collects by collecting device and the maximum defluxion that test specimen produces under load action are poor, calculate the bending stifiness modulus of asphalt test specimen under each four-point bending load action and analyze the Decay Law of test specimen bending stifiness modulus in four-point bending Repeated Loading process.
4. asphalt repeated load four-point bending stiffness modulus method of testing according to claim 3, it is characterized in that: step 1) in when the LVDT sensor is installed, the support that LVDT is installed is by sticking on beam type test specimen middle part 1/3 across being bolted on test specimen on place, footpath neutral surface; The sheet metal that contacts with the gauge head of LVDT is bolted on test specimen by two on the neutral surface that sticks on the test specimen span centre.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104915480A (en) * | 2015-05-22 | 2015-09-16 | 山东省交通科学研究院 | Determination method for semi-rigid base bituminous pavement crack damage state |
| CN105043896A (en) * | 2015-06-18 | 2015-11-11 | 宁波东方电缆股份有限公司 | Method for testing bending stiffness of underwater cable |
| CN105203414A (en) * | 2015-09-24 | 2015-12-30 | 长沙理工大学 | Testing method for dynamic modulus of bituminous mixture |
| CN107389475A (en) * | 2017-08-21 | 2017-11-24 | 西南交通大学 | Asphalt interlaminar shear strength test device based on four_point bending beam method |
| CN108956325A (en) * | 2018-07-05 | 2018-12-07 | 广西大学 | Square strength detection method is answered in a kind of concrete bending resistance |
| CN109724863A (en) * | 2018-12-11 | 2019-05-07 | 南京工程学院 | Apply the device and its test method of constant load for cement-based material test specimen |
| CN110658086A (en) * | 2019-08-31 | 2020-01-07 | 长沙理工大学 | Asphalt pavement load response analysis method considering tension-compression modulus difference |
| CN112697608A (en) * | 2020-12-10 | 2021-04-23 | 太原理工大学 | Method for judging plastic bending resistance bearing capacity of full section of steel member under bidirectional bending |
| CN113670709A (en) * | 2021-08-30 | 2021-11-19 | 河南省交通规划设计研究院股份有限公司 | Method for evaluating fatigue resistance of waterproof adhesive layer and bridge deck pavement composite structure |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104915480B (en) * | 2015-05-22 | 2018-02-13 | 山东省交通科学研究院 | Semi-rigid asphalt pavement crack damage state determines method |
| CN104915480A (en) * | 2015-05-22 | 2015-09-16 | 山东省交通科学研究院 | Determination method for semi-rigid base bituminous pavement crack damage state |
| CN105043896A (en) * | 2015-06-18 | 2015-11-11 | 宁波东方电缆股份有限公司 | Method for testing bending stiffness of underwater cable |
| CN105043896B (en) * | 2015-06-18 | 2018-06-05 | 宁波东方电缆股份有限公司 | The test method of underwater cable bending stiffness |
| CN105203414A (en) * | 2015-09-24 | 2015-12-30 | 长沙理工大学 | Testing method for dynamic modulus of bituminous mixture |
| CN107389475B (en) * | 2017-08-21 | 2019-10-11 | 西南交通大学 | Asphalt interlaminar shear strength test device based on four_point bending beam method |
| CN107389475A (en) * | 2017-08-21 | 2017-11-24 | 西南交通大学 | Asphalt interlaminar shear strength test device based on four_point bending beam method |
| CN108956325A (en) * | 2018-07-05 | 2018-12-07 | 广西大学 | Square strength detection method is answered in a kind of concrete bending resistance |
| CN108956325B (en) * | 2018-07-05 | 2021-04-09 | 广西大学 | Method for measuring bending moment strength of concrete |
| CN109724863A (en) * | 2018-12-11 | 2019-05-07 | 南京工程学院 | Apply the device and its test method of constant load for cement-based material test specimen |
| CN110658086A (en) * | 2019-08-31 | 2020-01-07 | 长沙理工大学 | Asphalt pavement load response analysis method considering tension-compression modulus difference |
| CN110658086B (en) * | 2019-08-31 | 2022-05-27 | 长沙理工大学 | Asphalt pavement load response analysis method considering tension-compression modulus difference |
| CN112697608A (en) * | 2020-12-10 | 2021-04-23 | 太原理工大学 | Method for judging plastic bending resistance bearing capacity of full section of steel member under bidirectional bending |
| CN112697608B (en) * | 2020-12-10 | 2022-09-13 | 太原理工大学 | Method for judging plastic bending resistance bearing capacity of full section of steel member under bidirectional bending |
| CN113670709A (en) * | 2021-08-30 | 2021-11-19 | 河南省交通规划设计研究院股份有限公司 | Method for evaluating fatigue resistance of waterproof adhesive layer and bridge deck pavement composite structure |
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