老化前后沥青与沥青混合料指标相关性分析

为分析老化前后沥青与沥青混合料指标相关性，开展了相应室内试验研究：在不同老化阶段进行沥青针入度、延度、软化点试验；在中、低温条件下，对不同老化时期AC-13沥青混合料进行半圆弯拉试验，分析混合料力学强度、弹性模量、断裂能演化规律；将老化前后沥青三大指标与沥青混合料力学指标进行相关性回归分析。试验结果表明，老化初期对混合料强度、弹性模量影响较大，且老化对弹性模量影响较为敏感；混合料对低温断裂能作用明显，中温断裂能显著高于低温断裂能；混合料老化前后的强度、弹性模量与沥青三大指标具有较高线性相关性，针入度可对中低温下混合料力学性能进行预测。

Correlation Analysis of Asphalt and Asphalt Mixture Index Before and After Aging Stages

In order to analyze the correlation between asphalt and asphalt mixture indexes before and after aging, this paper carried out a series of indoor experimental tests including:asphalt penetration, ductility and softening point tests at different aging stages, and the semi-circular bending tensile test of AC-13 asphalt mixture in different aging periods under the condition of medium and low temperature to analyze the evolution laws of the mechanical strength, the elastic modulus and the fracture energy of the mixture; The correlation regression analysis is carried out between the three indexes of asphalt before and after aging and the mechanical indexes of asphalt mixture. The test results show that the initial stage of aging has a great influence on the strength and elastic modulus of the mixture, and the aging is more sensitive to the elastic modulus; The mixture has an obvious effect on the low-temperature fracture energy, and the medium temperature fracture energy is significantly higher than the low-temperature fracture energy. The strength and the elastic modulus of mixture before and after aging have high a linear correlation with the three indexes of asphalt. Penetration can predict the mechanical properties of mixture at medium and low temperature.