冻融循环条件下的沥青混合料半圆弯拉试验  

Semi-circular bending test of asphalt mixture under freeze-thaw cycles

作　　者：李萍[1] 刘洋[1] 念腾飞 吴中[1,2] 毛昱 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]青海公路科研勘测设计院,青海西宁810001

出　　处：《江苏大学学报（自然科学版）》2018年第1期120-124,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51668041;51108222);甘肃省科技支撑计划项目(1504GKCA031)

摘　　要：在-20~20℃的冻融循环条件下,利用自行设计的半圆弯拉试验,研究了分别进行0,6,12和18次冻融循环后,SBS质量分数(w(SBS))分别为0,4%,5%和6%的沥青混合料AC-16,AC-20和SMA-16的层底抗拉强度和抗拉应变的影响.结果表明:冻融循环次数相同时,随w(SBS)的增加,沥青混合料的层底抗拉强度和抗拉应变先逐渐增大再逐渐减小;当w(SBS)为5%时,3种级配沥青混合料均表现良好的层底抗拉强度和抗拉应变;AC类沥青混合料的层底抗拉强度和抗拉应变均优于SMA类;季节性冰冻区采用w(SBS)为5%的AC-16沥青混合料可更好地减缓路面开裂.At the temperature range from-20 to 20 ℃ under freeze-thaw cycles,the semi-circular bending test(SCB test) was designed. Three kinds of asphalt mixture of AC-16,AC-20 and SMA-16 were prepared with respective SBS content of 0,4%,5% and 6%. The effects of SBS content on bottom layer tensile strength and tensile strain were analyzed for 0,6,12 and 18 times of freeze-thaw cycles. The experimental results show that for the same freeze-thaw cycles,with the increasing of SBS content,the tensile strength and the tensile strain at the bottom layer are gradually increased with latter decreasing.When the SBS content is 5%,3 kinds of asphalt mixture all show good bottom layer tensile strength and tensile strain. The bottom layer tensile strength and tensile strain of AC asphalt mixture are better than those of SMA asphalt mixture. In the seasonal freezing area,AC-16 asphalt mixture with SBS content of5% can better alleviate the cracking of road surface.

关 键 词：沥青混合料 冻融循环 半圆弯拉试验 抗拉强度 抗拉应变 

分 类 号：U414[交通运输工程—道路与铁道工程]