人工砂粒级对水工ECC材料强度及自愈合性能的影响  

Impacts of Artificial Sand Grading on Strength and Self-healing Properties of Hydraulic ECC Materials

作　　者：鄢勇 李杨 石妍[2] 陈程琦 YAN Yong;LI Yang;SHI Yan;CHEN Cheng-qi(Huadian Jinsha River Upstream Hydropower Development Co.Ltd.,Chengdu 610041,Sichuan Province,China;Yangtze River Scientific Research Institute,Wuhan 430010,Hubei Province,China)

机构地区：[1]华电金沙江上游水电开发有限公司,四川成都610041 [2]长江水利委员会长江科学院,湖北武汉430010

出　　处：《中国农村水利水电》2023年第9期90-96,共7页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(U2040222、52179122);中央级公益性科研院所基本科研业务费项目(CKSF2021456/CL)。

摘　　要：水工ECC材料具有韧性高、延性好、抗裂能力强、裂后自愈合等特点。本文制备了水胶比分别为0.35和0.25的水工ECC材料,研究了人工砂粒级对水工ECC材料抗压强度、劈拉强度的影响规律,并以抗压强度比为评价指标,分析了水工ECC材料自愈合性能的影响因素。结果表明:人工砂粒级对水工ECC材料的工作性有显著影响,但与抗压强度、自愈合性能之间缺少明确的相关关系,劈拉强度随人工粒级的降低而小幅增加。水工ECC材料具有较好的强度增长特性和自愈合能力,90 d龄期抗压强度较28 d龄期可增加30%~40%;水胶比、养护龄期和胶凝材料用量是影响水工ECC材料自愈合性能的重要因素,同时水化早期情况下,水工ECC材料愈合后的强度可超过受损前强度。Hydraulic ECC materials are characterized by large deformation ability,strong crack resistance and good self-healing capacity.In this paper,two strength grades of hydraulic ECC materials with water-binder ratio of 0.35 and 0.25 are prepared,and the influence of artifi⁃cial sand grading on compressive strength and splitting tensile strength of hydraulic ECC materials is studied.Moreover,key factors affecting the self-healing capacity of hydraulic ECC materials are analyzed by using compressive strength ratio as evaluation index.Experimental re⁃sults reveal that artificial sand grading has a significant effect on the workability of hydraulic ECC materials,while there is no notable correla⁃tion between artificial sand grading and compressive strength,and self-healing capacity and while splitting tensile strength increases slightly with the decrease in artificial grading.Hydraulic ECC material has good strength growth characteristics and self-healing capacity,and the compressive strength at 90 d age can be 30%~40%more than that of 28 d age.It is worth noting that hydraulic ECC materials strength after healing is possibly more than that of undamaged sample in early stage.

关 键 词：ECC 水工混凝土 自愈合 抗压强度比 

分 类 号：TV431[水利工程—水工结构工程]