摘要
为了评价改性沥青的低温抗开裂性能,应用带有数据采集功能的测力延度仪及自制硅橡胶模具,对7种不同改性沥青进行了预制裂纹紧凑拉伸试验,测试低温脆性条件下沥青的断裂行为;以裂纹尖端张开位移作为改性沥青低温抗开裂性能的评价指标,并通过室内沥青混合料约束试件温度应力试验(TSRST)研究了各断裂力学参数与沥青混合料冻断温度的相关性。研究结果表明:沥青紧凑试验可用于对沥青的低温性能进行更严格的区分;采用的临界裂纹尖端开口位移指标反映了沥青材料本身低温脆性状态下的抗裂纹扩展能力,适合作为沥青低温抗开裂性能的评价指标;室内沥青混合料冻断试验结果也验证了所提出方法及指标的合理性。
To evaluate the low temperature anti-cracking performance of modified asphalt,force ductility testing machine with data acquisition system and self-made silicone rubber mold were used to carry out the precracked compact tensile test on seven different types of modified asphalts so as to test the fracture behavior of asphalt under low temperature conditions,and crack tip opening displacement was considered as the index of measuring the low temperature anti-cracking performance of modified asphalt to examine the relationship between the fracture mechanics parameters and the freezing temperature of asphalt mixture through indoor TSRST test.The results show that the precracked compact tensile test can discriminate low temperature of asphalt more exactly;the proposed index can reflect the asphalt’s resistance to crack propagation under brittle low-temperature conditions,which is more suitable to be the evaluation index of low temperature anti-cracking performance of asphalt;the results of indoor asphalt mixture TSRST test also proves the rationality of the proposed method and index.3tabs,6figs,21 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第3期19-24,32,共7页
Journal of Chang’an University(Natural Science Edition)
基金
陕西省交通科技项目(14-29R)
关键词
道路工程
改性沥青
低温抗开裂性能
断裂行为
裂纹尖端张开位移
抗裂纹扩展
road engineering
modified asphalt
low temperature anti-cracking performance
fracture bebavior
critical crack tip opening displacement
resistance to crack propagation
