自由水含量对高应变率下水泥砂浆动态力学性能的影响  

Effect of free water content on the dynamic mechanical behavior of cement mortar under high strain rate

作　　者：丁宁[1] 金龙[1] 张建 

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]江苏铭城建筑设计院有限公司,江苏盐城224005

出　　处：《混凝土》2013年第10期128-132,共5页Concrete

基　　金：国家自然科学基金重点项目(90510017);国家自然科学基金面上项目(50979032)

摘　　要：为了研究高应变率下含水量对水泥砂浆动态抗压力学性能的影响,采用分离式Hopkinson压杆(SHPB)试验装置对五种不同含水量(饱和度分别为0、25%、50%、75%、100%)的30个水泥砂浆试件进行了单轴动态压缩试验研究。加载的冲击速度为10 m/s,应变率为102s-1。试验结果表明,不同含水量水泥砂浆应力-应变曲线相似,水泥砂浆动态抗压强度随着含水量的增加而降低,饱和状态动态抗压强度要比完全干燥状态低23%;同完全干燥状态相比,随着含水量的增加,水泥砂浆的杨氏弹性模量先增加后减小,饱和状态动态杨氏弹性模量要比完全干燥状态低23%;水泥砂浆的峰值压应变和极限压应变不随含水量的变化而变化。In order to reveal the effect of water content on the dynamic compress mechanical behavior of cement mortar under high strain rate, The uniaxial rapid compressive loading testing of a total of 30 specimens with five different saturations（0,25%, 50%, 75% and 100% respectively ）were executed in this paper.The technique ＇ Split Hopkinson pressure bar＇ （SHPB）was used.The impact velocity was 10 m/s with the corresponding strain rate as102 s ＇.The data obtained fi＇om test indicates that the similarity exists in the shape of strain-stress curves of cement mortars with different water content.The dynamic compressive strength of cement mortar increased with the decreasing of water content, the dynamic compressive strength of the saturated specimens was 23% lower than that of the totally dry specimens.With an increase in water content, the Young＇s modulus first increases and then decreases, the Young＇s modulus of the saturated specimens was 23% lower than that of the totally dry specimens.No significant changes occurred in the critical and ultimate strain value as the water content is changed.

关 键 词：水泥砂浆 含水量 SHPB 动态抗压力学性能 试验 

分 类 号：TU528.01[建筑科学—建筑技术科学]