东南大学学报（英文版）2021，Vol.37Issue(1)：67-74,8.DOI:10.3969/j.issn.1003-7985.2021.01.009
干湿-碳化耦合作用对全珊瑚海水混凝土耐久性的影响
Effect of carbonation-drying-wetting on durability of coral aggregate seawater concrete
摘要
Abstract
Based on the drying-wetting cycles experiment and the carbonation-drying-wetting cycles experiment for coral aggregate seawater concrete(CASC)with different strength grades,the effects of carbonation-drying-wetting on the durability of CASC are studied with the surface state,mass loss rate,relative dynamic elastic modulus,ultrasonic wave velocity and cube compressive strength as indices.Results show that the mass loss rate of CASC increases gradually with the increase in cycle times in the drying-wetting and carbonation-drying-wetting cycles.The mass loss rate increases relatively slowly at the initial stage but it increases remarkably after 10 cycles.The relative dynamic elastic modulus and ultrasonic wave velocity decrease gradually with the increase in cycle times.After 6 cycles,the decrease rate of the relative dynamic elastic modulus and ultrasonic wave velocity of CASC tends to be flat and the surface is slightly damaged.Compared with the initial 28 d cube compressive strength,the cube compressive strength of CASC decreases by 8.8％to 11.0％.Drying-wetting cycles and carbonation can accelerate seawater erosion on CASC,and drying-wetting cycles result in salting-out and accelerate the destruction of concrete.Therefore,the carbonation-drying-wetting accelerates the destruction of CASC.关键词
全珊瑚海水混凝土/干湿循环/干湿-碳化耦合作用/质量损失率/动弹性模量/超声波波速Key words
coral aggregate seawater concrete/drying-wetting cycles/carbonation-drying-wetting cycles/mass loss rate/relative dynamic elastic modulus/ultrasound wave velocity分类
建筑与水利引用本文复制引用
达波,余红发,麻海燕,窦雪梅,吴彰钰,陈岩..干湿-碳化耦合作用对全珊瑚海水混凝土耐久性的影响[J].东南大学学报（英文版）,2021,37(1):67-74,8.基金项目
The National Natural Science Foundation of China(No.11832013,51878350),the Fundamental Research Funds for the Central Universities(No.B210202023),the Natural Science Foundation of Jiangsu Province(No.BK20180433),the Water Resources Science and Technology Project of Jiangsu Province(No.2020017),the Basic Science Research Project of Nantong(No.JC2020120),the Key Labo-ratory of Coastal Disaster and Defence of Ministry of Education(Hohai University)(No.202006). （No.11832013,51878350）
