含水率对掺硅灰混凝土声学特性的影响研究  

Water Content and Its Effect on Acoustic Characteristics of Silica Fume Concrete

作　　者：刘琨[1] 严武建[1,2] 牛富航 吴志坚 郑海忠 LIU Kun;YAN Wu-jian;NIU Fu-hang;WU Zhi-jian;ZHENG Hai-zhong

机构地区：[1]中国地震局兰州地震研究所中国地震局(甘肃省)黄土地震工程重点实验室,兰州730000 [2]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,兰州730000 [3]南京工业大学交通学院,211800

出　　处：《混凝土与水泥制品》2019年第9期15-18,共4页China Concrete and Cement Products

基　　金：中国地震局地震预测研究所基本科研业务费专项项目(2014IESLZ01);国家科技支撑计划项目(2014BAG05B05);国家自然科学基金项目(51678545、41472297)

摘　　要：为了研究含水率对硅灰混凝土的声波参数和物理力学性质的影响,进行了硅灰混凝土的超声波测试,同时测试了其在零含水率情况下的抗压强度。并基于试验结果分析了含水率对硅灰混凝土波速的影响以及波速与抗压强度的关系。结果表明,硅灰混凝土超声波纵波速度随含水率的增大逐渐增大且至饱和状态达到峰值,含水率从零增大至2%附近时,横波波速先增大而后随含水率的增大急剧减小;硅灰混凝土声波波速与抗压强度存在良好的线性相关性,在相同含水率条件下,硅灰混凝土的抗压强度越大,声波波速越高。通过对含水率的估算,可以将这一特性应用到无损检测中,作为评定混凝土强度变化的手段之一。In order to study the influence of water content on the acoustic characteristics and the mechanical properties of silica fume concrete, ultrasonic tests in silica fume concrete were conducted and compressive strengths were measured on the zero water content. Based on the testing results, the effect of water content on the ultrasonic wave velocity of silica fume concrete and the relationship between the wave velocity and the compressive strength was discussed. Ultrasonic P-wave velocity of silica fume concrete increased gradually with the increase of water content and reached the peak when the saturation state, the S-wave velocity increased with the increase of water content from zero water content then decreased sharply with the peak of water content. There existed a good linear correlation between the ultrasonic wave velocity and the compression strength of silica fume concrete. The larger the compression strength,the faster the wave. It can be concluded that by estimating the water content, this characteristic can be applied to NDE as one of the means for assessing the change of concrete strength.

关 键 词：硅灰混凝土 含水率 超声波测试 波速 抗压强度 

分 类 号：TU528.45[建筑科学—建筑技术科学]