摘要
远海工程建设面临钢筋混凝土易腐蚀、河砂和淡水匮乏等难题。国内外学者选择资源丰富的海水海砂代替淡水河砂制备混凝土,并研究其工作性能、力学性能及耐久性能。海水海砂中高含量的氯盐会加快水泥水化和凝结,导致早凝和早期强度提高,但后期增长变缓,最终强度与淡水河砂混凝土相近。海砂中少量的贝壳对混凝土工作性能和力学性能影响不大。海水海砂混凝土中的氯离子传输及结合方式更为复杂,其不同于内掺型氯离子,由此导致海水海砂混凝土中的钢筋锈蚀机理改变。辅助胶凝材料、复合型阻锈剂及纤维增强复合筋等为海水海砂混凝土结构应用提供了保障。
Problems such as corrosion of reinforced concrete,lack of river sand and fresh water cause difficulties in the construction of offshore projects.Due to the rich resources of seawater and sea-sand,experts and scholars at home and abroad put forward to use seawater and sea-sand instead of fresh water and river sand to prepare concrete.Workability,mechanical properties and durability of seawater and sea-sand concrete were studied.Chlorine salts of seawater and sea-sand accelerate the setting and hydration of cement,leading to early setting and increasing the early strength of the concrete.However,the strength of seawater and sea-sand concrete grows slowly in the later period,and its final strength is similar to that of ordinary concrete.A small amount of shells in sea-sand has little effect on the workability and mechanical properties of concrete.Different from doped chloride ion,the mechanisms of chloride transmission and binding capabilities of seawater and sea-sand concrete are more complex.As a result,the mechanism of reinforcement corrosion in seawater and sea-sand concrete is changed.However,supplementary cementitious materials,compound rust inhibitor and fiber reinforced polymer bar provide guarantee for the application of seawater and sea-sand concrete structures.
作者
李师财
于泳
金祖权
LI Shicai;YU Yong;JIN Zuquan(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第12期3743-3752,共10页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(U1806225,51708314)。
关键词
海水海砂混凝土
力学性能
耐久性
氯离子结合
钢筋锈蚀
seawater and sea-sand concrete
mechanical property
durability
chloride binding
reinforcement corrosion
