变温条件下沥青混凝土抗裂特性研究  

Study on Cracking Resistance of Asphalt Concrete Under Variable Temperature Conditions

作　　者：曾亮亮 Zeng Liangiang(Guizhou Ming'an Construction Engineering Co.Ltd.,Rongjiang,Guizhou 557200)

机构地区：[1]贵州铭安建设工程有限公司,贵州榕江557200

出　　处：《江西建材》2024年第6期75-77,共3页

摘　　要：文中通过小梁弯曲及拉伸应力应变试验,对不同温度条件对沥青混凝土的抗裂性能影响进行研究。研究发现,在-60~-20℃低温条件下,沥青胶结硬化导致沥青混凝土呈现出高脆性和高刚度特性,且随着温度的降低,其抗裂性能逐渐递减。而随着温度升高至20~60℃,沥青混凝土的黏性增加,混凝土处于塑性变形阶段,裂缝扩展速度减缓,混凝土表现出较好的延展性,不会立即出现断裂,且温度越高沥青混凝土的塑性变形阶段越长。In this paper,the influence of different temperature conditions on the crack resistance of asphalt concrete was studied through tra-becular bending and tensile stress and strain tests.It is found that at-60~-20 C,asphalt cementation hardening results in high brileness and stiffness of asphalt concrete,and its cracking resistance decreases gradually with the decrease of temperature.As the temperature rises to 20~60℃,the viscosity of asphalt concrete increases,the concrete is in the plastic deformation stage,the crack expansion rate slows down,and the concrete shows good ductility and will not break immediately.The higher the temperature,the longer the plastic deformation stage of asphalt concrete.

关 键 词：沥青混凝土 抗裂性能 不同温度 应力应变曲线 

分 类 号：U416.217[交通运输工程—道路与铁道工程]