沥青混合料泊松比测定方法的探讨

Study on Method to Determine Asphalt Mixture Poisson’s Ratio

摘要:

为探讨沥青混合料泊松比的变化规律，运用基于间接拉伸试验和单轴压缩试验两种试验方法对沥青混合料泊松比进行了测定对比分析，提出了间接拉伸试验更适合于沥青混合料泊松比测定的观点.试验分析结果表明，低温或小荷载作用下，HMA泊松比在小范围内波动，可视为一个常数;而高温或大荷载作用下，随着温度的升高或荷载比的增大，HMA泊松比有增大趋势，并成为温度和应力状态的函数.理论分析也认为混合料泊松比是温度和应力状态的函数，验证了试验测试结果.不同物理意义的泊松比反映了某种工作条件下沥青混合料的侧向变形阻抗能力.

Abstract:

The changing law of Poisson’s ratio of asphalt mixtures was obtained and analyzed by comparing the results of two measuring methods based on indirect tensile test and uniaxial compression test.The test results show that the Poisson’s ratio of hot mix asphalt (HMA) remains stable and can be a constant at low temperature or small load, and becomes the function of temperature and stress at high temperature of large load. The theoretical study also shows that HMA Poisson’s ratio becomes the function of temperature and stress at high temperature of large load, and validates the test results. The Poisson’s ratio of different physical meaning reflects the lateral displacement resistance of asphalt mixture with varied running conditions.