摘要
沥青混合料是一种典型的粘弹塑性材料.文中通过半圆弯拉试验,采用J积分理论和延迟开裂时间评价其延迟开裂性能,测得在不同荷载水平和不同试验温度下沥青混合料的延迟开裂时间,以及不同试验温度下的断裂韧度,研究其裂缝起裂规律.结果表明,裂缝的起裂表现出明显的粘弹塑性特征,采用J积分理论和延迟开裂时间评价沥青混合料的断裂性能时,简单的流变本构关系依然适用.
Based on the semi-circular bending test, the delayed cracking properties of asphalt mixture, a typical viscoelastic-plastic material, are evaluated using the J-integral theory and the delayed-cracking initiation time. The delayed-cracking initiation time in different loading and temperature conditions as well as the fracture toughness at different testing temperatures is also measured to reveal the rules of crack initiation. The results show that the crack initiation displays obvious viscoelastic-plastic characteristics, and that a simple rheological constitutive model is applicable enough for the evaluation of fracture performance of asphalt mixture using the J-integral theory and the delayed-cracking initiation time.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第11期7-11,21,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(50278037)
关键词
沥青混合料
J积分
半圆弯拉试验
断裂韧度
延迟开裂
asphalt mixture
J-integral
semi-circular bending test
fracture toughness
delayed cracking
