变温条件下胶粉改性沥青混凝土抗裂特性研究  

Anti-cracking characteristics of crumb rubber-modified asphalt concrete under variable temperature conditions

作　　者：付涵 柴军瑞[1] 许增光[1] 耿凯强 王奕璇 FU Han;CHAI Junrui;XU Zengguang;GENG Kaiqiang;WANG Yixuan(State Key Laboratory of Eco-hydraulic Engineering in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,西安710048

出　　处：《水力发电学报》2024年第6期53-62,共10页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金重点项目(52039008);国家自然科学基金项目(51679197);陕西省创新团队(2022TD-01)。

摘　　要：为探究胶粉改性沥青混凝土在水利工程环境下的抗裂性能,本文基于小梁弯曲试验及全应力-应变曲线脆性指标,探究了变温条件下胶粉改性沥青混凝土的抗裂性能。结果表明:胶粉改性沥青抗裂性能最优时的配比为80M,掺量20%;低温条件下,胶粉改性沥青混凝土的抗弯强度及峰值应变优于基质沥青混凝土;温度越低,沥青混凝土的脆性指标越大,试件越容易开裂;胶粉的加入降低了基质沥青混凝土的脆性指标,使其抗裂性能有所提升,同时改变了基质沥青混凝土在-10℃时的受力状态,其应力-应变曲线由脆性特征转变为塑性特征。本文研究有望为面板选材提供新思路。This paper studies the cracking resistance of crumb rubber-modified asphalt concrete(CRMAC)under variable temperature conditions in water conservancy engineering environment,based on the small beam bending test and the brittleness index of full stress-strain curves.The results show that at the optimum performance,the ratio of CRMAC cracking resistance is 80M at a crumb rubber dosage of 20%.Under low temperature conditions,the bending strength and peak strain of CRMAC are better than those of matrix asphalt concrete;the lower the temperature,the larger the brittleness index of asphalt concrete,and the more prone to cracking of the specimen.Adding crumb rubber reduces the brittleness index of matrix asphalt concrete and improves its cracking resistance;it also changes the stress state of matrix asphalt concrete at-10℃,and changes the stress-strain curve from brittle to plastic characteristics.This study provides new approaches for panel material selection.

关 键 词：胶粉 水工沥青混凝土 变温 脆性指标 

分 类 号：TV441[水利工程—水工结构工程]