杜强业,贡力,张秉宗,贾治元,李义强

• 1:兰州交通大学土木工程学院

摘要(Abstract)：

为研究西北地区水工混凝土在多因素耦合作用下的损伤特征，根据现场调研结果设计了室内加速试验，得到了干湿-冻融-盐侵作用下各试件质量损失率、抗压强度、相对动弹性模量的变化规律；通过核磁共振扫描结果分析了各试件T_2谱的演化规律，并以灰色系统理论计算出了试件相对动弹性模量与T_2图谱之间的关联度。研究结果表明：随着试验的进行，冻融-干湿-盐侵对试件造成的损伤效应不断积累，试件各项参数持续下降，最终失效；核磁共振扫描所得T_2谱总面积随试验进行不断增大，其中峰1、峰2面积占T_2谱总面积的比例不断减小，而峰3所占比例不断增大；试件相对动弹性模量与T_2图谱中峰1、峰2的关联度最高，可根据T_2图谱中峰1、峰2的分布情况对试件损伤程度作初步判断。在试验中发现聚丙烯纤维能削弱冻融-干湿-盐侵对混凝土的破坏作用，可在水工混凝土设计中掺入聚丙烯纤维以延长输水建筑物的使用寿命。

关键词(KeyWords)： 纤维混凝土;多因素耦合;核磁共振;灰色关联分析

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51969011);; 甘肃省科技计划资助项目(20JR10RA274)

作者(Author): 杜强业,贡力,张秉宗,贾治元,李义强

DOI: 10.13928/j.cnki.wrahe.2022.08.018

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