防灾减灾工程学报2026，Vol.46Issue(2)：303-312,336,11.DOI:10.13409/j.cnki.jdpme.20240904003
海水环境下全轻陶粒混凝土与普通混凝土粘结界面抗剪强度演化研究
Shear Strength Evolution of Bond Interface between Full-lightweight Ceramsite Concrete and Ordinary Concrete in Seawater Environment
摘要
Abstract
Full-lightweight ceramsite concrete has the advantage of causing only a small increase in structural self-weight when used to reinforce concrete components.The degradation behavior of the bond interface between it and existing concrete is crucial for evaluating the durability deterioration of reinforced components in the seawater environment.Lightweight aggregate concrete-ordinary concrete bond interface specimens with three types of interfacial agents(epoxy resin,cement paste,acrylic ac-id)and three roughness levels(1,3,and 5 mm)were subjected to high-temperature accelerated ero-sion in artificial seawater solution for 0 to 150 days.Slant shear tests were then conducted on the erod-ed interface specimens to analyze the morphological changes of the specimens,shear failure modes,and the degradation patterns of bond strength.The results showed that during the erosion process in the seawater environment,the interfacial shear failure mode of the specimens gradually changed from mixed cohesive failure to bond failure with increasing erosion time.The interfacial bond strength first increased slowly and then decreased significantly with increasing erosion time.At 60 days of erosion,the epoxy resin interface with roughness of 3 mm had the highest slant shear strength of 19.95 MPa.The maximum reduction in slant shear strength of the concrete interface after 150 days of erosion was 23%.After 150 days of erosion in the seawater solution,the slant shear strength of the interface under the roughness levels of 1,3,and 5 mm decreased by 22.65%,21.75%,and 22.93%,respectively,compared with that before erosion.Appropriate interfacial roughening treatment can improve the corro-sion resistance of the concrete interface.During the erosion process,under the same roughness level,the maximum slant shear strengths of the specimens using epoxy resin interfacial agents were greater than those using cement paste and acrylic acid.Regardless of the roughness level and interfacial agent used,the effect of the seawater environment on the interfacial slant shear strength was very significant(all F-values were greater than F0.025).The findings are significant for evaluating the degradation of interfacial durability performance of existing concrete structures reinforced with lightweight aggregate concrete in the seawater environment.关键词
全轻陶粒混凝土/普通混凝土/界面粘结/抗剪强度/海水环境Key words
full-lightweight ceramsite concrete/ordinary concrete/interface bonding/shear strength/seawater environment分类
建筑与水利引用本文复制引用
朱红兵,何浩,段亦雪,付正昊..海水环境下全轻陶粒混凝土与普通混凝土粘结界面抗剪强度演化研究[J].防灾减灾工程学报,2026,46(2):303-312,336,11.基金项目
国家自然科学基金(51778630)、湖北省高等学校优秀中青年科技创新团队计划基金项目(T2022002)、武汉科技大学湖北省"十四五"优势特色学科(群)基金项目(2023D0501)资助 （51778630）
