CN108693053A - A kind of test method of asphalt residual intensity - Google Patents

A kind of test method of asphalt residual intensity Download PDF

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Publication number
CN108693053A
CN108693053A CN201810374901.5A CN201810374901A CN108693053A CN 108693053 A CN108693053 A CN 108693053A CN 201810374901 A CN201810374901 A CN 201810374901A CN 108693053 A CN108693053 A CN 108693053A
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China
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test
fatigue
asphalt
test specimen
tensile strength
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马涛
童巨声
丁珣昊
陈�田
张垚
林子豪
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Southeast University
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Southeast University
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    • 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
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a kind of test methods of asphalt residual intensity, include the following steps:1) bitumen mixture specimen is prepared, fatigue test is carried out, determines the fatigue rule of development;2) it is additionally carried out one group of fatigue test, so that test specimen is stopped load in the non-failure stage of test specimen;3) tensile strength test is carried out at once to the test specimen for stopping load;4) step 2), step 3) are repeated, determines the Tensile strength under different fatigue level;5) residual intensity being fitted under different fatigue state, obtains the relationship of residual intensity-damage fatigue;The present invention is by way of fatigue test progress synchronous with tensile strength test, the Decay Law with material fatigue damage that the ultimate tensile strength of asphalt different fatigue stage is determined has great importance for Pavement Design with the traffic control scheme formulated in the life cycle management of road surface.

Description

A kind of test method of asphalt residual intensity
Technical field
The present invention relates to technical field of road engineering more particularly to a kind of test methods of asphalt residual intensity.
Background technology
The features such as since bituminous paving has evenness of road surface, noise is small, and the construction time is short, and later maintenance maintenance facilitates, at present The extensive use in road engineering.With asphalt and the maturation of pavement construction technology, the loose class of mixture, roadbed The early damages form such as depression is fewer and fewer.Instead, the long-term disease such as fatigue is increasingly becoming influence bituminous paving The principal element of service life.
The fatigue development of asphalt is sent out along with the deterioration of a variety of mechanical properties of material with the fatigue of material Exhibition, the ultimate bearing capacity of material also can gradually decline.Current road design method is according to not damaged asphalt mixture material Intensity, with the increase of the road surface length of service, the residual intensity of ground surface material will gradually decline, in the range of design bearing load It is interior to generate the bearing capacity more than structure and there is a phenomenon where road surfaces to accelerate the failure.Accordingly, it is determined that the residue of ground surface material Rule between intensity and fatigue development has Pavement Design with the traffic control scheme formulated in the life cycle management of road surface Important meaning.
Invention content
In view of the above problems, present invention aims at provide a kind of experiment side of asphalt residual intensity Method obtains the tensile strength of asphalt with tired by being carried out at the same time fatigue test and test for tensile strength to multigroup test specimen The Decay Law of labor development provides corresponding mechanical foundation further to carry out highway layout with maintenance management.
In order to achieve the above object, the technical solution adopted by the present invention is as follows:A kind of survey of asphalt residual intensity Method for testing includes the following steps:
1) compound test specimen is prepared according to test requirements document, carries out first group of fatigue test, determines current compound test specimen Fatigue life Nf, fatigue damage variables D and fatigue damage Decay Law f (D);
2) it under experimental condition identical with first group of fatigue test, takes second group of compound test specimen to carry out fatigue test and adds It carries, when load number is α1NfWhen, wherein 0≤α1< 1 stops load test;
3) asphalt bend test is carried out to step 2) treated compound test specimen immediately, obtain experience fatigue plus The bending tensile strength R of test specimen after loadB1;
4) step 2), step 3) under the same test conditions, are repeated, it is respectively α to obtain load number2Nf,α3Nf,……αnNfWhen, corresponding bending tensile strength is RB2,RB3,……RBn;The data that repetition obtains should at least be no less than 3 Group, and obtained data should be covered since fatigue test to the range that fatigue Life terminal is as wide as possible.
5) bending resistance of the tired Decay Law f (D) by being obtained in step 1) and material under different fatigue load number is drawn strong Spend RB2,RB3,……RBn, obtain the remaining bending tensile strength R of compound test specimenBWith the relational expression of fatigue damage variables D:
RB=aD2+bD+c
Wherein, a, b, c are parameter, are obtained by test data fitting.
Compound test specimen is according to JTG E20-2011 highway engineerings pitches and asphalt in the step 1) of the present invention In testing regulations prepared by the requirement of T 0739-2011 asphalts four-point bending fatigue life test.
In the step 1) of the present invention, the fatigue damage variables D of compound test specimen is characterized with the stiffness of test specimen, and relational expression is such as Under:
Wherein, D is fatigue damage variable, EiFor test specimen ith CYCLIC LOADING when stiffness, E0For the initial stiffness of test specimen; Fatigue test is repeated load test, and above-mentioned Nf is final load number, this i be during testing certain it is primary plus Carry number.
In the step 1) of the present invention, fatigue damage Decay Law f (D), relational expression is as follows:
Wherein, D is fatigue damage variable;N is stress-number of cycles;a*, p, q are damage parameters, according to test data Recurrence obtains.
In the step 3) of the present invention, tensile strength test test method is according to JTG E20-2011 highway engineerings pitches and drip T 0715-2011 asphalt bend tests in green test mixture regulation.
The advantage of the invention is that:A kind of method of asphalt residual intensity Decay Law provided by the invention, side Method is by the asphalt four-point bending fatigue life in JTGE20-2011 highway engineerings pitch and Asphalt Mixture Experiment regulation Progress is combined in experiment with bend test, obtains Decay Law of the asphalt tensile strength with fatigue development, is highway layout Mechanical foundation is provided with the maintenance management scheme for formulating the road surface length of service later stage.Meanwhile by asphalt residual intensity with Fatigue test destroys the statistics relationship of critical condition, may be used to determine the reliability of different fatigue stage material.
Description of the drawings
Fig. 1 is the flow chart of the method for the present invention;
Specific implementation mode
The present invention is described in further detail with specific implementation mode for explanation below in conjunction with the accompanying drawings.
JTG E20-2011 in the description and embodiments of the present invention are Asphalt Mixture Experiment reputable code, T 0739-2011 is specification Asphalt Mixture fatigue test code, and T 0715-2011 are specification Asphalt Mixture bend test Code;The test method referred in the present invention is not limited to any asphalt, can meet appointing for code requirement What asphalt.
Embodiment 1:As shown in Figure 1, a kind of method of asphalt residual intensity Decay Law, includes the following steps:
1) mixed according to T 0739-2011 pitches in JTG E20-2011 highway engineerings pitches and Asphalt Mixture Experiment regulation Material four-point bending fatigue life test is closed to require to prepare matrix 70# bitumen A C-20 mixtures.Test temperature is 15 DEG C, load frequency Rate 10Hz, using controlled strain loading mode, load level is 800 μ ε.First group of fatigue test is carried out, current mixture is obtained Fatigue life Nf=2400 times.
The fatigue damage of material is characterized with the stiffness of test specimen, using following form:
In formula:D is the fatigue damage variable characterized with stiffness, EiFor test specimen ith CYCLIC LOADING when stiffness, E0For examination Initial stiffness before part load.
Fatigue test uses proof stress load mode.Fatigue damage Decay Law takes non-linear fatigue damage as follows Model:
In formula:D is fatigue damage variable;N is stress-number of cycles;a*, p, q are damage parameters, and with temperature, stress adds It is related to carry level, is obtained by test data recurrence.
For this example due to keeping temperature-resistant, load level is constant, therefore sets q=0.By the fatigue life under controlled strain pattern Decision rule, as D=0.5, it is determined as test specimen destroys, then above formula is represented by:
0.5=a*E0 pεpNf
Natural logrithm is taken to formula both sides, is obtained:
lnNf=-lna*-pln(E0ε)+ln0.5
Later by mathematical tools such as MATLAB to parameter a*, p progress linear fits.Fitting result is a in this example*= 3.2*10-7, p=3.8.
2) under experimental condition identical with first group, second group of test specimen is taken to carry out fatigue test load, when load number For α1NfWhen (0≤α1< 1), stop load.α is taken in this example1=0, i.e. second group of test specimen is loaded without fatigue test.
3) mixed according to T 0715-2011 pitches in JTG E20-2011 highway engineerings pitches and Asphalt Mixture Experiment regulation Material bend test is closed, bending tensile strength test is carried out to second group of test specimen as quickly as possible, determines the examination after experience fatigue loading The bending tensile strength R of partB1。
4) step 2), step 3) are repeated under same test conditions, it is 0.3N to obtain load numberf,0.6Nf,0.9NfWhen, Corresponding material bending tensile strength RB2,RB3,RB4。
5) by the bending tensile strength of the tired Decay Law and material under different fatigue load number that are obtained in step 1), intend Close out the rule of material residue bending tensile strength-damage.
Material residual intensity RBFollowing form is used with the Decay Law of the fatigue damage D of material:
RB=aD2+bD+c
A in formula, b, c are parameter.By the fatigue damage rule of development obtained in step 1), can must load number be 0, 0.3Nf,0.6Nf,0.9NfInjury tolerance D under number1,D2,D3,D4;By D1,D2,D3,D4With bending tensile strength RB1,RB2,RB3,RB4 Least square fitting is carried out using mathematical softwares such as MATLAB, you can obtains out parameter a, b, c.
It should be noted that above-mentioned is only presently preferred embodiments of the present invention, protection model not for the purpose of limiting the invention It encloses, the arbitrary combination made on the basis of the above embodiments or equivalents all belong to the scope of protection of the present invention.

Claims (6)

1. a kind of test method of asphalt residual intensity, which is characterized in that include the following steps:
1) compound test specimen is prepared according to test requirements document, carries out first group of fatigue test, determines the fatigue of current compound test specimen Service life Nf, fatigue damage variables D and fatigue damage Decay Law f (D);
2) under experimental condition identical with first group of fatigue test, second group of compound test specimen is taken to carry out fatigue test load, When load number is α1NfWhen, wherein 0≤α1< 1 stops load test;
3) asphalt bend test is carried out to step 2) treated compound test specimen immediately, after obtaining experience fatigue loading Test specimen bending tensile strength RB1;
4) step 2), step 3) under the same test conditions, are repeated, it is respectively α to obtain load number2Nf,α3Nf,……αnNf When, corresponding bending tensile strength is RB2,RB3,……RBn;
5) material under the different fatigue load number obtained in by the tired Decay Law f (D) that is obtained in step 1) and step 3), 4) The bending tensile strength R of materialB1,RB2,RB3,……RBn, obtain the remaining bending tensile strength R of compound test specimenBWith fatigue damage variable The relational expression of D:
RB=aD2+bD+c
Wherein, a, b, c are parameter, are obtained by test data fitting.
2. the test method of asphalt residual intensity as described in claim 1, which is characterized in that the step 1) In, compound test specimen is according to JTG E20-2011 highway engineerings pitches and T 0739-2011 in Asphalt Mixture Experiment regulation Prepared by the requirement of asphalt four-point bending fatigue life test.
3. the test method of asphalt residual intensity as described in claim 1, which is characterized in that the step 1) In, the fatigue damage variables D of compound test specimen is characterized with the stiffness of test specimen, and relational expression is as follows:
Wherein, D is fatigue damage variable, EiFor the stiffness in fatigue test when test specimen ith CYCLIC LOADING, E0For the first of test specimen Beginning stiffness.
4. the test method of asphalt residual intensity as described in claim 1, which is characterized in that the step 1) In, fatigue damage Decay Law f (D), relational expression is as follows:
Wherein, D is fatigue damage variable;N is stress-number of cycles;a*, p, q are damage parameters, are returned according to test data Go out.
5. the test method of asphalt residual intensity as described in claim 1, which is characterized in that the step 3) In, the bending tensile strength testing experiment method of asphalt is mixed with pitch according to JTG E20-2011 highway engineering pitches The requirement of T 0715-2011 asphalt bend tests is implemented in material testing regulations.
6. the test method of asphalt residual intensity as described in claim 1, which is characterized in that the step 4) In, repeat the operation of step 2) and step 3), obtained αnNfAnd RBnGroup number is no less than 3 groups.
CN201810374901.5A 2018-04-24 2018-04-24 A kind of test method of asphalt residual intensity Pending CN108693053A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109580361A (en) * 2019-01-26 2019-04-05 长沙理工大学 A method of evaluation asphalt property of compression fatigue
CN109580360A (en) * 2019-01-26 2019-04-05 长沙理工大学 Bituminous pavement strength check methods under a kind of Simple stress condition
CN113190962A (en) * 2021-03-29 2021-07-30 大连海事大学 Asphalt mixture fatigue life prediction method based on stable value of relative change rate of accumulated dissipation energy

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107885933A (en) * 2017-11-07 2018-04-06 东南大学 A kind of pavement structure fatigue cracking method for numerical simulation based on extension finite element

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107885933A (en) * 2017-11-07 2018-04-06 东南大学 A kind of pavement structure fatigue cracking method for numerical simulation based on extension finite element

Non-Patent Citations (1)

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Title
徐凯: "基于剩余强度的沥青混凝土耐久性室内研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109580361A (en) * 2019-01-26 2019-04-05 长沙理工大学 A method of evaluation asphalt property of compression fatigue
CN109580360A (en) * 2019-01-26 2019-04-05 长沙理工大学 Bituminous pavement strength check methods under a kind of Simple stress condition
CN113190962A (en) * 2021-03-29 2021-07-30 大连海事大学 Asphalt mixture fatigue life prediction method based on stable value of relative change rate of accumulated dissipation energy
CN113190962B (en) * 2021-03-29 2022-09-06 大连海事大学 Asphalt mixture fatigue life prediction method based on accumulated dissipation energy relative change rate stable value

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Application publication date: 20181023