盐雾干湿循环作用下超高韧性水泥基复合材料动态压缩性能试验研究  

STUDY ON DYNAMIC COMPRESSION PROPERTIES OF ULTRA-HIGH TOUGHNESS CEMENTITOUS COMPOSITES UNDER CYCLIC WETTING AND DRYING OF SALT SPRAY

作　　者：陈奕琨 赵昕 李庆华[1] CHEN Yi-kun;ZHAO Xin;LI Qing-hua(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,Zhejiang 310058,China;College of Civil and Architectural Engineering,Zhejiang University of Science and Technology,Hangzhou,Zhejiang 310000,China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]浙江科技学院土木与建筑工程学院,浙江杭州310000

出　　处：《工程力学》2023年第S01期289-294,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(52225803,51908505);浙江省自然科学基金项目(LY21E080006)。

摘　　要：为研究滨海盐雾环境下超高韧性水泥基复合材料(UHTCC)的动态压缩力学性能,对2组不同腐蚀程度的UHTCC(腐蚀周期为0 d和60 d)开展3组不同应变率(10^(−4)s^(−1)、10^(−3)s^(−1)和10^(−2)s^(−1))的动态压缩力学试验,获得了材料的动态压缩应力-应变曲线和破坏形貌,分析了应变率对不同腐蚀程度的UHTCC弹性模量、峰值强度以及峰值应变的影响。结果表明:相比于未腐蚀试件,60 d盐雾干湿循环作用会导致UHTCC动态压缩强度分别提高44.5%、54.4%和62.4%,动态弹性模量分别提高19.4%、15.3%和28.4%,压缩强度的应变率敏感性上升。通过X射线电子计算机断层扫描(XCT)技术发现盐雾干湿循环环境下材料的孔隙率降低,微观结构变得更加密实。In order to study the dynamic compressive mechanical properties of ultra-high toughness cementitious composites(UHTCC)in coastal salt spray environment,dynamic compressive mechanical tests of three groups of different strain rates(10^(−4)s^(−1),10^(−3)s^(−1),and 10^(−2)s^(−1))were carried out on two groups of ultra-high toughness cementitious composites with different corrosion degrees(corrosion period of 0 d and 60 d),and the dynamic compressive stress-strain curves and failure morphology of materials were obtained.The effect of strain rate on elastic modulus,peak strength and peak strain of ultra-high toughness cementitious composites with different corrosion degree was analyzed.The results show that the dynamic compressive strength of ultra-high toughness cementitious composites is 44.5%,54.4%and 62.4%higher than that of the uncorroded specimen,and the dynamic elastic modulus is 19.4%,15.3%and 28.4%higher than that of the uncorroded specimen;while the strain rate sensitivity of the compressive strength increases.X-ray computed tomography showed that the porosity of the material decreased and became denser.

关 键 词：超高韧性水泥基复合材料 盐雾干湿循环 动态压缩力学性能 单轴压缩 应力-应变关系 

分 类 号：TU528[建筑科学—建筑技术科学]