基于间接拉伸开裂方法评价超薄磨耗层混合料抗裂性能  

Evaluation of Cracking Performance of Ultra-Thin Friction Course Mixture Based on Indirect Tensile Asphalt Cracking Test

作　　者：黄卫东[1] 张家伟[1] 吕泉[1] 蔡琪 HUANG Weidong;ZHANG Jiawei;LYU Quan;CAI Qi(Tongji University,Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Shanghai 201804,China;Tongji Architectual Design(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]同济大学建筑设计研究院(集团)有限公司,上海200092

出　　处：《同济大学学报（自然科学版）》2020年第11期1588-1594,共7页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(51778481,51978518,51908426)。

摘　　要：通过间接拉伸开裂(IDEAL-CT)试验方法,研究了不同级配及油石比条件下超薄磨耗层混合料的抗裂性能。结果显示,级配变密会导致混合料整体强度上升,抗变形能力下降,同时会加快裂缝扩展速度,混合料抗裂性能下降。油石比的增加会使混合料抗变形能力提升,延缓裂缝扩展速度,使得混合料抗裂性能增强。皮尔逊相关性分析结果表明,随着超薄磨耗层混合料的孔隙率和沥青膜厚度的增加,混合料整体强度降低,抗变形能力提升,裂缝开裂速度下降,混合料整体抗裂性能增强,因而超薄磨耗层混合料设计过程中可通过提升孔隙率和沥青膜厚度来增强混合料的抗裂性能。对于IDEAL-CT试验指标,断裂能不适用于评价超薄磨耗层混合料抗裂性能。This paper studied the cracking performance of ultra-thin friction course mixtures with different gradations and asphalt content by utilizing indirect tensile asphalt cracking test(IDEAL-CT).The results show that denser gradation would cause a higher mixture strength and a worse resistance to deformation,as well as a faster crack propagation,indicating a worse cracking resistance of mixture.With the increment of asphalt content,the deformation resistance of mixtures was enhanced and the crack propagation was postponed,which revealed that the cracking resistance of mixture was enhanced.The Pearson correlation analysis indicates that with the increment of air voids and asphalt film thickness,the strength of mixture decrease,the resistance to deformation is enhanced and the crack propagation is decreased,resulting in a better cracking resistance performance.Therefore,the air void and asphalt film thickness are recommended to be raised to improve the cracking resistance performance of mixture during ultrathin friction course design.For the indicators of IDEALCT test,the fracture energy is not appropriate to evaluation of the cracking resistance performance of ultrathin friction course mixture.

关 键 词：超薄磨耗层 开裂 间接拉伸开裂试验 级配 沥青膜厚度 

分 类 号：U414[交通运输工程—道路与铁道工程]