循环荷载、氯盐与冻融多因素作用下混凝土力学及抗渗性能研究  

Study on mechanics and impermeability of concrete under cyclic load,chlorine salt and freeze-thaw

作　　者：黄剑 李伟 於德美 付腾飞[2] HUANG Jian

机构地区：[1]中交四航局第五工程有限公司,福建福州350008 [2]福建农林大学交通与土木工程学院,福建福州350002 [3]长安大学公路学院,陕西西安710061

出　　处：《福建建设科技》2023年第2期61-64,共4页Fujian Construction Science & Technology

基　　金：福建省自然科学基金项目(No.2019J05051,No.2019J01407);中交四航产学合作课题(ZJSHW-FZDTLZ-2021-E3-048)。

摘　　要：混凝土的力学特性和抗渗性能直接影响其服役耐久性,开展荷载、冻融等多因素耦合作用下混凝土力学和抗渗性能影响研究,有利于分析混凝土性能衰变机理。本文对道路混凝土采用氯盐溶液浸泡并同步施加动态荷载和冻融循环作用,并测试分析各侵蚀龄期混凝土抗弯拉强度、相对动弹性模量及表观扩散系数时变规律。结果表明,冻融循环作用下混凝土抗弯拉强度降低,循环荷载加速了冻融对混凝土的损伤。冻融循环使得混凝土抗渗性能显著下降。The mechanical properties and impermeability of concrete directly affect its service durability.The study on the influence of mechanical properties and impermeability of concrete under the coupling of load,freeze-thaw and other factors is conducive to the analysis of the decay mechanism of concrete properties.In this paper,the concrete of road is soaked with chlorine salt solution,and the dynamic load and freeze-thaw cycle are applied simultaneously,and the time-varying law of flexural tensile strength,relative dynamic elastic modulus and apparent diffusion coefficient of concrete at different erosion ages is tested and analyzed.The results show that the flexural and tensile strength of concrete decreases under the action of freeze-thaw cycle,and the cyclic load accelerates the damage of freeze-thaw to concrete.Freeze-thaw cycle makes the impermeability of concrete decrease significantly.

关 键 词：道路混凝土 氯盐腐蚀 循环荷载 损伤因子R 影响效应系数K 

分 类 号：U414[交通运输工程—道路与铁道工程]