摘要
目的研究橡胶混凝土在盐冻环境下的抗冻性能,以降低混凝土的孔隙率。方法以3种橡胶粉粒径与3种掺量为变化参数,对橡胶混凝土和普通混凝土进行快速冻融循环试验,以质量变化率和相对动弹模损失率为评价指标,并用扫描电镜(SEM)对混凝土内部损伤机理进行分析。结果随着橡胶粉掺量的增加,混凝土质量和动弹性模量都呈现下降趋势,橡胶粉的掺入改善了混凝土的抗冻性能,且300-RC-20-80橡胶混凝土有害及多害孔所占比例为37.97%,相比普通混凝土冻融循环300次后的有害及多害孔少14.27%,橡胶混凝土内部结构更加密实。结论橡胶混凝土的抗冻性能优于普通混凝土,RC-20-80橡胶混凝土在盐冻环境下的抗冻性能最优。
The frost resistance of rubber concrete in salt-freezing environment was studied in order to reduce the porosity of the concrete.Three kinds of rubber powder particle size and three kinds of content were used as the change parameters.And the rubber concrete and ordinary concrete were subjected to rapid freeze-thaw cycle tests.Rate of quality change and relative dynamic elastic modulus loss rate taken as evaluation indicators,and with the help of scanning electron microscope(SEM)observation,the internal damage mechanism of concrete is studied and analyzed.The test results show that with the increase of the rubber powder content,the concrete quality and dynamic elastic modulus both show a downward trend,but the rubber powder blending improves the frost resistance of the concrete,and 300-RC-20-80 rubber concrete is harmful and has harmful pores with the proportion 37.97%,which is 14.27%less harmful and harmful holes than that of ordinary concrete with 300 freeze-thaw cycles.So the frost resistance of rubber concrete is better than that of ordinary concrete.RC-20-80 rubber concrete has the best frost resistance under salt-freezing environment.
作者
闻洋
贺希茂
崔浩
宋文学
WEN Yang;HE Ximao;CUI Hao;SONG Wenxue(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou,China,014010;Baotou Highway Engineering Company,Ltd.,Baotou,China,014010)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第1期135-141,共7页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51768056)
内蒙古自治区自然科学基金项目(2019MS05038)。
关键词
橡胶混凝土
冻融损伤规律
压汞试验
微观结构
抗冻性
rubber concrete
freeze-thaw damage law
mercury intrusion test
microstructure
freeze resistance
