基于温度应力的温拌沥青胶结料低温力学性能

Mechanical Properties of Warm Mix Asphalt at Low Temperature Based on Thermal Stress Calculations

摘要:

为准确评估Sasobit温拌产品对沥青胶结料低温力学性能的影响，同时考虑温拌沥青胶结料在降温过程中所产生的累积和松弛作用，基于小梁弯曲流变（BBR）试验计算获得了温拌沥青胶结料的温度应力，运用Huet模型进行参数拟合并采用统计学方法对温拌产品的影响效果作了进一步分析.结果表明：2%及以上Sasobit温拌产品的加入使得沥青材质变硬，致使温拌沥青胶结料出现更高的低温PG分级、更大的温度应力和更高的临界开裂温度；Huet模型的参数分析和统计学方法分析进一步证实了此硬化影响的存在.

Abstract:

In order to accurately evaluate the influence of the warm mix product on the low temperature mechanical properties of the asphalt, with considering the accumulation and relaxation of thermal stress during the cooling process of the warm mix asphalt binder the thermal stress of the warm mix asphalt binder was calculated on the basis of the bending beam rheological(BBR) test, the rheological Huet model was used for parameter fitting and statistical methods were used to further analyze the effects of warm mix products. The test results show that the addition of 2% or more of Sasobit warm mix product hardens the asphalt, which results in higher low temperature PG, higher thermal stress and higher critical cracking temperature. The parameter analysis of the Huet rheological model and statistical analysis further confirm the existence of this hardening effect.