硅酸盐通报2024，Vol.43Issue(5)：1889-1896,8.
CO2矿化改性高钙粉煤灰对水泥砂浆力学性能和微结构的影响
Effect of CO2-Mineralized High-Calcium Fly Ash on Mechanical Properties and Micro-Structure of Cement Mortar
摘要
Abstract
To improve the volume stability and hydration activity of high-calcium fly ash(HFA),CO2 mineralization treatment was applied in this paper.The CO2 uptake percentage and free CaO content of HFA undergone different CO2 mineralization duration were experimentally determined.The influence of CO2-mineralized HFA on hydration heat,mechanical properties and pore structure of cement mortar was investigated.The results show that after 12 h of CO2 mineralization modification treatment,the carbon sequestration of high calcium fly ash exceeds 10％(mass fraction),and the content of free calcium oxide in high calcium fly ash is significantly reduced.As the prolongation of CO2mineralization,the hydration induction period of cement slurry mixed with HFA is shortened,and the early hydration heat release is significantly reduced.CO2 mineralization can also mitigate the adverse impacts of HFA on mechanical strength,as well as improving the pore structure of cement mortar by reducing porosity and volume fraction of large capillary pores.Besides,CO2-mineralized HFA provides more nucleation sites for precipitation of C-S-H,accelerating the early hydration reaction of cement paste.关键词
高钙粉煤灰/CO2矿化/力学性能/孔结构/游离氧化钙/水泥砂浆Key words
high-calcium fly ash/CO2 mineralization/mechanical property/pore structure/free CaO/cement mortar分类
建筑与水利引用本文复制引用
黄煌煌,陈铁锋,高小建..CO2矿化改性高钙粉煤灰对水泥砂浆力学性能和微结构的影响[J].硅酸盐通报,2024,43(5):1889-1896,8.基金项目
湖北隆中实验室自主创新研究项目(2022ZZ-37) （2022ZZ-37）
宁波市重点研发计划(2023Z101) （2023Z101）
黑龙江省自然科学基金(LH2023E120) （LH2023E120）
