杨少伟1,2,刘孜睿2,杜 义2,赵爱宁2
杨少伟,刘孜睿,杜义,等.ECC-既有混凝土界面黏结性能研究[J].混凝土与水泥制品,2024(6):64-67.
YANG S W,LIU Z R,DU Y,et al.Study on the bonding performance of the interface between ECC and existing concrete[J].China Concrete and Cement Products,2024(6):64-67.
ECC-既有混凝土界面黏结性能研究
杨少伟1,2,刘孜睿2,杜 义2,赵爱宁2
杨少伟,刘孜睿,杜义,等.ECC-既有混凝土界面黏结性能研究[J].混凝土与水泥制品,2024(6):64-67.
YANG S W,LIU Z R,DU Y,et al.Study on the bonding performance of the interface between ECC and existing concrete[J].China Concrete and Cement Products,2024(6):64-67.
摘 要:利用工程水泥基复合材料(ECC)对混凝土结构进行维修和加固时,新旧材料的界面黏结强度至关重要。研究了不同养护条件(标准养护、20 ℃水养、-10 ℃自然养护、40 ℃自然养护)下,涂刷界面剂[乙酸乙烯酯(VA)、乙酸乙烯酯-乙烯(VAE)、乙酸乙烯酯-叔碳酸乙烯酯(VA/VeoVa)]对ECC-既有混凝土界面黏结性能的影响,并在标准养护条件下,对比分析了涂刷VA/VeoVa、凿毛、凿毛+涂刷VA/VeoVa对ECC-既有混凝土界面黏结性能的影响。结果表明:与VA、EVA相比,VA/VeoVa在各养护条件下均能有效提高试件的拉伸黏结强度;标准养护条件下,凿毛+涂刷VA/VeoVa对试件拉伸黏结强度的提高效果最好,其次是凿毛,最后是涂刷VA/VeoVa。
Abstract:The interfacial bond strength of the new and old materials is crucial for the repair and reinforcement of concrete structures using engineered cementitious composites (ECC). The effects of brushing interfacial agents [vinyl acetate (VA), vinyl acetate-ethylene (VAE), vinyl acetate-tertiary vinyl carbonate (VA/VeoVa)] on the bonding property of the ECC-existing concrete interface were investigated under different curing conditions (standard curing, water curing at 20 ℃, natural curing at -10 ℃, and natural curing at 40 ℃). The effects of brushing VA/VeoVa, chiseling, chiseling+brushing VA/VeoVa on the bonding property of ECC-existing concrete interface were comparatively analyzed under standard curing conditions. The results show that VA/VeoVa is effective in improving the tensile bond strength of the specimens under all curing conditions compared with VA and EVA. Under standard curing conditions, chiseling + brushing VA/VeoVa has the best effect on improving the tensile bond strength of the specimens, followed by chiseling, and lastly, brushing VA/VeoVa.
版权所有:中国混凝土与水泥制品网 苏ICP备10086386号 网站建设:中企动力 苏州