人民长江2024，Vol.55Issue(2)：222-230,9.DOI:10.16232/j.cnki.1001-4179.2024.02.029
盐侵冻融作用下非饱和掺碱粉煤灰混凝土损伤研究
Damage of alkali-doped fly ash concrete with different saturation under combined action of sulfate erosion and freeze-thaw cycle
摘要
Abstract
In order to make alkali-activated fly ash concrete more widely used in engineering,the influence of alkaline activa-tor on the durability of fly ash concrete was studied,and the durability of alkali-activated fly ash concrete in different saturation(30%,60%,100%)and different sulfate solution concentration(0,5%,10%)were studied.The damage of specimens was evaluated from the aspects of appearance damage,mass loss,compressive strength loss and dynamic elastic modulus loss of alkali-activated fly ash concrete,and the erosion damage mechanism of specimens under sulfate erosion and freeze-thaw cycle cou-pling was analyzed by electron microscopy scanning technology.The results showed that the frost resistance of the specimens in 100%saturation was the worst in the 10%sodium sulfate solution.The compressive strength loss and dynamic elastic modulus loss of alkali-activated fly ash concrete had two stages of steady decline and accelerated decline.The deterioration degree of un-saturated specimens decreased with the decrease of saturation,so the durability under unsaturated conditions was better.Through theoretical analysis and laboratory test,a damage model of alkali-activated fly ash concrete with different saturations under sul-fate erosion and freeze-thaw cycle coupling was established.关键词
碱激发粉煤灰混凝土/耐久性/饱和度/冻融循环/硫酸盐侵蚀Key words
alkali-activated fly ash concrete/durability/saturation/freeze-thaw cycle/sulfate erosion分类
建筑与水利引用本文复制引用
邵善庆,龚爱民,王福来,屈宝莉..盐侵冻融作用下非饱和掺碱粉煤灰混凝土损伤研究[J].人民长江,2024,55(2):222-230,9.基金项目
云南省教育厅科学研究基金项目(2022Y286) （2022Y286）
