温度对沥青混凝土力学特性的影响

Effect of temperature on mechanical properties of asphalt concrete

沥青混凝土是现代水利工程中作为防水心墙的主要材料。通过室内高压温控三轴仪对两种沥青含量的沥青混凝土在不同温度下分别进行力学特性试验,研究温度对其力学性质的影响。试验结果表明:试件的应力-应变特性与温度有密切关系,试验温度为0℃时沥青混凝土出现应力软化现象,但随着温度的升高,应力软化现象消失,应力硬化现象呈现;同一沥青含量下,温度越高,最大偏应力越小;试件的抗剪强度随温度的升高逐渐降低;试件的蠕变随温度的升高而增大。

Asphalt concrete is the main waterproofing material of core wall in hydraulic projects. The effects of temperature on mechanical properties of asphalt concrete is studied through testing of mechanical characteristics of asphalt concrete with two kinds of asphalt contents under different temperatures by high-pressure triaxial apparatus. Test results indicate that： the stress-strain character of asphalt concrete sample is closely related to the temperature. Stress-strain shows stress softening when temperature is 0℃, however, with temperature rise, stress softening disappears and stress hardening appears. In same asphalt content, the higher the temperature is, the smaller the maximum deviatoric stress is. The shear strength of specimen reduces with temperature rise. Creep of specimen increases with temperature rise.