隧道洞渣粗骨料混凝土抗冻性能试验研究  

Frost resistance of concrete tunnel slag as replacement of coarse aggregate

作　　者：罗涵欣 黄靓[1] 刘文琦 赵鹏鹏 吕召宁 肖瑶 LUO Hanxin;HUANG Liang;LIU Wenqi;ZHAO Pengpeng;LUZhaoning;XIAO Yao(College of Civil Engineering,Hunan University,Changsha 410082,China;Chinese Railway Construction Investment Group Co.,Ltd.,Beijing 102629,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]中建铁路投资建设集团有限公司,北京102629

出　　处：《混凝土》2024年第2期157-161,共5页Concrete

基　　金：国家重点研发计划(2019YFC1904700);中建集团重点科技创新课题“CZ铁路高原环境绿色与数字建造关键技术研究”(CSCEC-2021-S-2)。

摘　　要：通过高寒地区隧道洞渣粗骨料混凝土冻融循环试验,研究在不同冻融循环次数下,隧道洞渣粗骨料取代率对混凝土抗冻性能的影响,分析试件相对动弹性模量、质量、抗压强度和劈裂抗拉强度损失率的变化规律。结果表明:混凝土的抗冻性能与洞渣粗骨料取代率呈负相关,当洞渣粗骨料取代率达到30%时,洞渣粗骨料混凝土相对动弹性模量、质量、冻融试验后的抗压强度和劈裂抗拉强度损失率与普通混凝土相差不大,其抗冻性能相对较好,冻融循环50次前试件破坏程度均较小而100次之后试件严重破坏,在冻融循环后期粉煤灰的填充效应随着洞渣粗骨料取代率的增加而增加。Through the freeze-thaw cycle test of tunnel slag coarse aggregate concrete in alpine region,the influence of replacement rate of tunnel slag coarse aggregate on the frost resistance of concrete under different freeze-thaw cycles was studied,and the variation law of relative dynamic elastic modulus,mass,compressive strength and splitting tensile strength loss rate of specimens was analyzed.The results show that the frost resistance of concrete is negatively correlated with the substitution rate of slag coarse aggregate.When the substitution rate is 30%,the loss rates of relative dynamic elastic modulus,mass,compressive strength and splitting tensile strength of slag coarse aggregate concrete are not significantly different from those of ordinary concrete,and the frost resistance of slag coarse aggregate concrete is relatively good.The damage degree of specimens before 50 times of freezing-thawing cycle is small,and the specimens after 100 times of freezing-thawing cycle are seriously damaged.The filling effect of fly ash increases with the increase of the substitution rate of slag coarse aggregate in the late stage of freezing-thawing cycle.

关 键 词：混凝土 隧道洞渣 高寒地区 冻融循环试验 抗冻性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]