Fatigue life prediction of asphalt mastics based on simplified viscoelastic continuum damage model(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年04期
- Page:
- 35-43
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Fatigue life prediction of asphalt mastics based on simplified viscoelastic continuum damage model
- Author(s):
- MA Xiaoyan1; 2; CHEN Huaxin1; 2; YANG Pingwen3; XING Mingliang1; 2; WANG Kai4; KUANG Dongliang1; 2
- (1. School of Material Science and Engineering, Changan University, Xian 710061, Shaanxi, China; 2. Engineering Research Center of Transportation Material, Ministry of Education, Changan University, Xian 710061, Shaanxi, China; 3. Gansu Luqiao Construction Group Maintenance Technology Co., Ltd., Lanzhou 730000, Gansu, China; 4. Ningbo Traffic Construction Project Testing and Inspection Center Co., Ltd., Ningbo 315121, Zhejiang, China)
- Keywords:
- road engineering; fatigue damage evolution; SVECD model; asphalt mastic; fatigue life
- PACS:
- -
- DOI:
- -
- Abstract:
- To study the effect of asphalt binder and filler volume fraction on the fatigue properties of asphalt mastics, the relation between shear stress and strain was analyzed and the fatigue loading times were calculated. SK90 and KL70 asphalts and a limestone filler were selected to fabricate asphalt mastics of four different filler volume fractions. The strain sweep test and a simplified viscoelastic continuum damage (SVECD) model, which can predict the fatigue life of materials in a given loading history using a series of limited tests, were used to predict the fatigue loading times of asphalt mastics. Temperaturefrequency sweep tests were conducted and complex modulus master curves were obtained according to the timetemperature equivalence principle. The CAM model was applied to fit the master curve. The slope of the frequencymodulus curve in double logarithmic coordinates and the shift factor were used as the input parameters of the SVECD model. The results showed that adding fillers to asphalt decreased the peak width of the LAS stressstrain curves of the asphalt mastic and its strain dependence increases with the growth of filler volume fraction. There is an optimal volume fraction at which point the maximum allowable stress occurs. The fatigue life of asphalt mastics decreases with an increase in the filler volume fraction, and the better the fatigue property of the asphalt binder at the same filler volume fraction. The physicochemical interaction between the asphalt and filler, the better the fatigue property of the corresponding mastics. 5 tabs, 14 figs, 19 refs.
Last Update: 2019-07-29