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Life prediction of high modulus asphalt pavement based onfatigue cumulative damage(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2018年02期
Page:
26-33
Research Field:
道路工程
Publishing date:

Info

Title:
Life prediction of high modulus asphalt pavement based onfatigue cumulative damage
Author(s):
XU Jianping;  ZHAO Yi;  LIANG Naixing;  QIN Min
(1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. Jiangxi ProvincialExpressway Investment Group Co., Ltd., Nanchang 330025, Jiangxi, China； 3. School of Materials Science andEngineering, Chongqing Jiaotong University, Chongqing 400074, China; 4. School of Economics andManagement, Chongqing Jiaotong University, Chongqing 400074, China)
Keywords:
road engineering;  high modulus asphalt mixture;  fatigue cumulative damage;  strain fatigue equation;  service life
PACS:
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DOI:
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Abstract:
In order to accurately predict the service life of the high modulus asphalt pavement, a new method for predicting the service life of asphalt pavement which considering its temperature distribution, axial load distribution and fatigue performance of asphalt mixture was proposed based on fatigue cumulative damage theory. According to the split strength test and indirect tensile fatigue test, the strain fatigue equations of P0AC25 (without PRModule) and P0.5AC25 (with PRModule content 0.5%) two kinds of asphalt mixture were determined. Based on Fuzhou to Jian (Fuji) Expressway Project, the annual pavement temperature interval distribution frequency, the annual pavement axle load grade distribution frequency and function times of different axial load levels in different temperature ranges in design life were calculated, which were introduced to the process of the calculation of pavement structure surface bottom layer tensile strain, and the tensile strain was more in line with the actual road conditions.Based on Miner fatigue cumulative damage theory,the fatigue cumulative damage of P0AC25 and P0.5AC25 two kinds of asphalt mixtures under different temperature ranges and different axle loads were calculated, and then the service life of common asphalt pavement and high modulus asphalt pavement of Fuji Expressway based on the fatigue cumulative damage was obtained. The results show that the service life of high modulus asphalt pavement and common asphalt pavement of Fuji Expressway was 14.21 and 11.52 years respectively based on fatigue cumulative damage, therefore, high modulus asphalt pavement has better fatigue resistance than the ordinary asphalt pavement, and its service life is increased by 23.5%. Taking tensile strain of bottom layer as the mechanical indexes of asphalt mixture fatigue life prediction and based on the new method of cumulative fatigue damage of asphalt pavement service life prediction, which fully consider the asphalt pavement structure temperature interval distribution and axial load grade distribution, the accurate prediction model is established to accurately describe the process and law of fatigue attenuation of asphalt mixture. 9 tabs, 8 figs, 20 refs.

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Last Update: 2018-04-03