CN104849154A - Identification method for fatigue failure of pitch under dynamic shear load effect - Google Patents
Identification method for fatigue failure of pitch under dynamic shear load effect Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000010426 asphalt Substances 0.000 claims abstract description 50
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000011068 loading method Methods 0.000 claims description 24
- 238000010008 shearing Methods 0.000 claims 1
- 238000009661 fatigue test Methods 0.000 abstract description 12
- 238000007405 data analysis Methods 0.000 abstract description 2
- 238000010998 test method Methods 0.000 abstract description 2
- 238000009825 accumulation Methods 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
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Abstract
动态剪切荷载作用下沥青发生疲劳失效的识别方法,它涉及一种应用动态剪切流变仪测试道路沥青疲劳性能的试验方法。它解决了目前沥青加速疲劳试验中关于疲劳失效临界点的判别问题,完善并提高了该试验数据分析过程的科学有效性。本发明在虚应变坐标下对沥青的加速疲劳试验数据进行分析,通过计算试验过程中材料存储的虚应变能来定量分析疲劳损伤的产生和积累,最后提出将存储虚应变能的峰值点作为沥青发生疲劳失效的临界点判据。
The invention discloses a method for identifying fatigue failure of asphalt under the action of a dynamic shear load, which relates to a test method for testing the fatigue performance of road asphalt with a dynamic shear rheometer. It solves the problem of judging the critical point of fatigue failure in the current asphalt accelerated fatigue test, and improves the scientific validity of the test data analysis process. The present invention analyzes the accelerated fatigue test data of asphalt under virtual strain coordinates, quantitatively analyzes the occurrence and accumulation of fatigue damage by calculating the virtual strain energy stored in the material during the test, and finally proposes to use the peak point of stored virtual strain energy as the asphalt The critical point criterion for the occurrence of fatigue failure.
Description
技术领域technical field
本发明属于建筑材料领域,它涉及一种判断道路沥青在动态剪切荷载作用下发生疲劳失效的识别方法。The invention belongs to the field of building materials, and relates to a recognition method for judging fatigue failure of road asphalt under the action of dynamic shear load.
背景技术Background technique
沥青路面由于行车轮载的反复作用会发生疲劳开裂,路面上的疲劳裂缝严重影响着道路行车的舒适和安全。沥青抗疲劳性能的优劣对于沥青路面抵抗疲劳裂缝的能力有着重要的贡献,因此需要科学、有效的对不同沥青材料的抗疲劳性能进行评价和区分。控制应变的线性振幅扫描试验(即线性应变扫描试验)是目前国际上常用的沥青加速疲劳规范试验方法[1],该方法自2010年提出后,关于试验过程中沥青发生疲劳失效的临界点判别问题一直处于研究状态,还没有很好的指标和参数来表征和区分不同沥青抗疲劳性能的优劣。Fatigue cracks will occur on the asphalt pavement due to the repeated action of the wheel load, and the fatigue cracks on the pavement seriously affect the comfort and safety of road driving. The pros and cons of asphalt fatigue resistance have an important contribution to the ability of asphalt pavement to resist fatigue cracks, so it is necessary to evaluate and distinguish the fatigue resistance of different asphalt materials scientifically and effectively. The linear amplitude sweep test with controlled strain (i.e., linear strain sweep test) is currently a commonly used asphalt accelerated fatigue specification test method in the world [1] . The problem has been in the research state, and there are no good indicators and parameters to characterize and distinguish the pros and cons of different asphalt fatigue resistance.
发明内容Contents of the invention
本发明的目的是对沥青加速疲劳试验过程中材料发生疲劳失效的临界点进行判断和识别,从而定量的比较不同沥青材料在动态剪切荷载作用下的疲劳寿命。本发明的具体实施过程和分析方法如下。The purpose of the present invention is to judge and identify the critical point of material fatigue failure during asphalt accelerated fatigue test, so as to quantitatively compare the fatigue life of different asphalt materials under dynamic shear load. The specific implementation process and analysis method of the present invention are as follows.
动态剪切荷载作用下沥青发生疲劳失效的识别方法,其特征在于应用动态剪切流变仪对平行板沥青试样在5℃~30℃任一温度下,完成控制应变的线性振幅扫描试验,动态应变振幅的扫描范围从0.1%线性增大至30%,动态加载频率为10Hz,扫描时间设计为5-15分钟;而后依据试验中所采集到的剪切应力τ和剪切应变γ数据,计算虚剪切应变γR指标和试验过程中材料所存储的虚应变能指标WR s;最后,将试验过程中存储虚应变能WR s的峰值点作为沥青疲劳失效的临界点,该特征点所对应的循环加载次数N即为沥青在此温度、加载频率和加载速率下的疲劳寿命Nf。The method for identifying fatigue failure of asphalt under dynamic shear load is characterized in that a dynamic shear rheometer is used to complete a linear amplitude sweep test of controlled strain on a parallel plate asphalt sample at any temperature from 5°C to 30°C, The scanning range of the dynamic strain amplitude increases linearly from 0.1% to 30%, the dynamic loading frequency is 10Hz, and the scanning time is designed to be 5-15 minutes; then according to the shear stress τ and shear strain γ data collected in the test, Calculate the virtual shear strain γ R index and the virtual strain energy index W R s stored in the material during the test; finally, the peak point of the stored virtual strain energy W R s during the test is taken as the critical point of asphalt fatigue failure. The number of cyclic loading N corresponding to the point is the fatigue life N f of asphalt at this temperature, loading frequency and loading rate.
进一步,通过改变线性应变扫描试验的扫描时间产生不同的加载速率,相同应变扫描范围、试验温度和加载频率条件下,不同加载速率下所识别的沥青疲劳寿命也将不同。Furthermore, by changing the scanning time of the linear strain scanning test to produce different loading rates, under the same strain scanning range, test temperature and loading frequency, the fatigue life of asphalt identified under different loading rates will also be different.
进一步,扫描时间设计为5分钟。Further, the scanning time is designed to be 5 minutes.
进一步,扫描时间设计为10分钟或15分钟。Further, the scanning time is designed to be 10 minutes or 15 minutes.
更为具体的:More specifically:
(1)应用动态剪切流变仪对平行板沥青试样进行线性应变扫描试验,按照该试验的规范要求[1],剪切应变从0.1%线性增长至30%,试验加载频率固定为10Hz,试验温度可选5℃~30℃任一温度,扫描时间设计为5分钟。(1) Apply dynamic shear rheometer to conduct linear strain scanning test on parallel plate asphalt samples. According to the specification requirements of the test [1] , the shear strain increases linearly from 0.1% to 30%, and the test loading frequency is fixed at 10Hz , The test temperature can be any temperature from 5°C to 30°C, and the scan time is designed to be 5 minutes.
(2)通过控制扫描时间可以改变试验过程中所施加的动态剪切加载速率,在保持应变扫描范围、试验温度和和加载频率不变的条件下,本发明还进行了扫描时间为10分钟和15分钟的对比试验。(2) The dynamic shear loading rate applied in the test process can be changed by controlling the scanning time. Under the condition of keeping the strain scanning range, the test temperature and the loading frequency constant, the present invention has also carried out the scanning time as 10 minutes and 15-minute comparison test.
(2)试验完成后,对试验数据按照如下程序进行分析;(2) After the test is completed, analyze the test data according to the following procedure;
i.根据动态剪切流变仪采集到的剪切应变(γ)数据按照公式(1)计算虚剪切应变(γR)指标,其中|G*|0为在此特定温度和加载频率下沥青试样无损伤状态的线粘弹性动态剪切模量,可通过线性应变扫描试验前的一个小应变单点动态试验测试而得;i. Calculate the virtual shear strain (γ R ) index according to the formula (1) according to the shear strain (γ) data collected by the dynamic shear rheometer, where |G * | 0 is at this specific temperature and loading frequency The linear viscoelastic dynamic shear modulus of the asphalt sample in the undamaged state can be obtained by a small-strain single-point dynamic test before the linear strain sweep test;
γR=γ·|G*|0 γ R = γ·|G * | 0
(1)(1)
ii.对动态剪切流变仪采集到的剪切应力(τ)数据在虚剪切应变(γR)坐标下进行分析,见附图1所示;按照公式(2)对每个数据点计算试验过程中材料存储的虚应变能(WR s)指标,即附图1中虚线部分面积;ii. The shear stress (τ) data collected by the dynamic shear rheometer is analyzed under the coordinates of the virtual shear strain (γ R ), as shown in accompanying drawing 1; according to formula (2) for each data point Calculate the virtual strain energy (W R s ) index stored in the material during the test, that is, the area of the dotted line in Figure 1;
iii.以计算得到的存储虚应变能(WR s)数值为纵坐标,对沥青试样施加的循环加载次数(N)为横坐标作图,见附图2所示,取WR s峰值点作为沥青发生疲劳失效的临界点,即可确定在此特定温度、加载频率和加载速率下沥青试样的疲劳寿命(Nf)。iii. Take the calculated stored virtual strain energy (W R s ) value as the ordinate, and the number of cyclic loadings (N) applied to the asphalt sample as the abscissa, as shown in Figure 2, take the peak value of W R s As the critical point of asphalt fatigue failure, the fatigue life (N f ) of the asphalt sample can be determined at this specific temperature, loading frequency and loading rate.
(3)在动态剪切流变仪采集到的剪切应力(τ)和循环加载次数(N)关系图中将确定的疲劳寿命(Nf)进行标注,见附图3所示。(3) Mark the determined fatigue life (N f ) in the relationship diagram between the shear stress (τ) collected by the dynamic shear rheometer and the number of cyclic loadings (N), as shown in Fig. 3 .
参考文献references
[1]Standard Method of Test for Estimating Damage Tolerance of Asphalt Binders Usingthe Linear Amplitude Sweep[S].American Association of State Highway andTransportation Officials(AASHTO)TP 101-14.[1]Standard Method of Test for Estimating Damage Tolerance of Asphalt Binders Using the Linear Amplitude Sweep[S].American Association of State Highway andTransportation Officials(AASHTO)TP 101-14.
附图说明Description of drawings
图1是沥青加速疲劳试验数据在虚应变坐标下的分析和存储虚应变能的表征Figure 1 is the analysis of asphalt accelerated fatigue test data in virtual strain coordinates and the characterization of stored virtual strain energy
图2是沥青加速疲劳试验过程中存储虚应变能的演化分析Figure 2 is the evolution analysis of stored virtual strain energy during the asphalt accelerated fatigue test
图3是加速疲劳试验过程中沥青疲劳失效临界点的典型识别结果Figure 3 is a typical identification result of asphalt fatigue failure critical point during accelerated fatigue test
图4是扫描时间为5分钟时基质沥青和SBS改性沥青发生疲劳失效的识别对比Figure 4 is a comparison of fatigue failure identification of matrix asphalt and SBS modified asphalt when the scanning time is 5 minutes
图5是扫描时间为10分钟时基质沥青和SBS改性沥青发生疲劳失效的识别对比Figure 5 is a comparison of fatigue failure identification of matrix asphalt and SBS modified asphalt when the scanning time is 10 minutes
图6是扫描时间为15分钟时基质沥青和SBS改性沥青发生疲劳失效的识别对比Figure 6 is a comparison of fatigue failure identification of matrix asphalt and SBS modified asphalt when the scanning time is 15 minutes
图7是沥青加速疲劳试验所确定的疲劳寿命和沥青实际疲劳寿命之间的对比Figure 7 is a comparison between the fatigue life determined by the accelerated fatigue test of asphalt and the actual fatigue life of asphalt
具体实施方式Detailed ways
具体实施方式一:本实施方式中,采用基质沥青和SBS改性沥青(简称SBS沥青)进行控制应变的加速疲劳试验,试验温度19℃,试验频率10Hz,线性应变扫描范围为0.1%~30%,扫描时间设计为5分钟完成。试验结束后,按照上述数据分析的流程识别两种沥青在此工况下各自的疲劳寿命,识别结果见附图4所示。Specific implementation mode 1: In this implementation mode, the accelerated fatigue test of controlled strain is carried out by using matrix asphalt and SBS modified asphalt (referred to as SBS asphalt), the test temperature is 19°C, the test frequency is 10Hz, and the linear strain scanning range is 0.1% to 30%. , The scanning time is designed to be completed in 5 minutes. After the test, the fatigue life of the two kinds of asphalt under this working condition was identified according to the above data analysis process, and the identification results are shown in Figure 4.
具体实施方式二:本实施方式与具体实施方式一的不同是线性应变扫描的扫描时间设计为10分钟,其它与具体实施方式一相同。识别结果见附图5所示。Embodiment 2: The difference between this embodiment and Embodiment 1 is that the scanning time of the linear strain scan is designed to be 10 minutes, and the others are the same as Embodiment 1. The recognition results are shown in Figure 5.
具体实施方式三:本实施方式与具体实施方式一的不同是线性应变扫描的扫描时间设计为15分钟,其它与具体实施方式一相同。识别结果见附图6所示。Embodiment 3: The difference between this embodiment and Embodiment 1 is that the scanning time of the linear strain scan is designed to be 15 minutes, and the others are the same as Embodiment 1. The recognition results are shown in Figure 6.
具体实施方式四:本实施方式与实施方式一至实施方式三的不同是,所用沥青材料为TP聚合物改性沥青(简称TP沥青)和橡胶粉试改性沥青(简称橡胶沥青),试验温度、应变扫描范围和加载频率与实施方式一至三相同,分别进行了扫描时间为5分钟、10分钟和15分钟的加速疲劳试验。Embodiment 4: The difference between this embodiment and Embodiment 1 to Embodiment 3 is that the asphalt materials used are TP polymer modified asphalt (abbreviated as TP asphalt) and rubber powder modified asphalt (abbreviated as rubber asphalt), test temperature, The strain scanning range and loading frequency are the same as those in Embodiments 1 to 3, and accelerated fatigue tests with scanning times of 5 minutes, 10 minutes and 15 minutes were carried out respectively.
将上述实施方式中四种沥青在不同加载速率下的加速疲劳试验识别结果和沥青实际的疲劳寿命(疲劳应变水平为5%和7%)在附图7中进行对比,可以看出,不同加载速率下沥青加速疲劳试验所识别的疲劳寿命和实际的疲劳寿命(5%疲劳应变和7%疲劳应变)有着很好的关联性,不同加载条件下沥青的抗疲劳性能排序保持了一致,证明了本发明针对加速疲劳试验所提出的沥青疲劳失效识别方法的科学有效性。Comparing the identification results of the accelerated fatigue tests of the four kinds of asphalt in the above embodiment at different loading rates with the actual fatigue life of the asphalt (the fatigue strain level is 5% and 7%) in the accompanying drawing 7, it can be seen that different loading There is a good correlation between the fatigue life identified by the asphalt accelerated fatigue test and the actual fatigue life (5% fatigue strain and 7% fatigue strain). The invention aims at the scientific validity of the asphalt fatigue failure identification method proposed by the accelerated fatigue test.
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