细级配沥青混合料的抗裂指标研究

Research on Crack Resistance Index of Fine Graded Asphalt Mixture

摘要:

裂缝严重影响了沥青路面的使用，研究沥青材料的微观断裂机理有助于提高路面使用寿命。通过利用半圆弯曲实验获取了不同试验条件下试件的荷载-位移数据，然后得出试件的强度以及断裂能，抗裂指数等各种断裂指标，分别研究了沥青砂浆在不同温度下的抗裂特性。分析了不同沥青种类、沥青膜厚度、试验温度、加载速率等因素对沥青砂浆的力学特性的影响，特别是抗裂性能。对沥青砂浆试件进行了定量定性的对比分析研究。

Abstract:

Cracks seriously affect the use of asphalt pavement. The study on the microscopic fracture mechanism of asphalt materials can help to improve the service life of pavements. The load-displacement data of specimens under different test conditions are obtained through the use of a semi-circular bending experiment， and then various fracture indicators such as the strength and fracture energy of the specimens， as well as the crack resistance index are obtained to study the crack resistance characteristics of asphalt mortar at different temperatures separately. The influences of different asphalt types， asphalt film thicknesses， test temperatures， loading rates and other factors on the mechanical properties of asphalt mortar are analyzed， especially its crack resistance. The quantitative and qualitative comparative analysis and study are conducted on the asphalt mortar specimens.