碳化养护对钢渣-熟石灰固碳砖耐久性的影响  

Effect of Carbonation Curing on Durability of Carbon Fixing Steel Slag-Slaked Lime Brick

作　　者：曹伟达 杨全兵[2] CAO Weida;YANG Quanbing(Chengdu Huge Construction Material Co.,Ltd.,Chengdu 610041,China;Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University,Shanghai 201804,China)

机构地区：[1]成都宏基建材股份有限公司,四川成都610041 [2]同济大学先进土木工程材料教育部重点实验室,上海201804

出　　处：《建筑材料学报》2023年第3期324-331,共8页Journal of Building Materials

基　　金：国家科技支撑计划(2006BAF02A24)。

摘　　要：研究了碳化养护工序对钢渣-熟石灰固碳砖抗冻融性能、抗硫酸盐侵蚀性能和抗盐结晶压性能等耐久性的影响,并用X射线衍射分析、热分析、孔结构分析和扫描电子显微分析对硬化浆体的微观结构进行了表征,揭示了其耐久性的改善机理.结果表明:钢渣-熟石灰固碳砖具有优良的耐久性;碳化养护过程中,钢渣-熟石灰固碳砖中化学稳定性差的Ca(OH)_(2)转变为稳定性高的CaCO_(3),硬化浆体的孔结构得以细化,因而钢渣-熟石灰固碳砖的耐久性得到显著改善;钢渣-熟石灰固碳砖的综合CO_(2)减排效益为179.4 kg/t,钢渣利用率为238.0 kg/t,环保效果显著.The effect of carbonation curing process on the durability of the carbon fixing steel slag-slaked lime brick,such as freezing-thawing resistance,sulfate resistance and salt crystallization resistance,were investigated.The microstructure of the hardened paste was characterized by X-ray diffraction analysis,thermal analysis,pore structure analysis and scanning electron microscopy analysis,and the mechanism of durability improvement was revealed.The results show that the durability of carbon fixing steel slag-slaked lime brick is excellent.During the carbonation process,Ca(OH)_(2)with poor chemical stability in the carbon fixing steel slag-slaked lime brick is transformed into CaCO_(3)with high stability,and the pore structure of the hardened paste is refined,thus the durability of the carbon fixing steel slag-slaked lime brick is significantly improved.The comprehensive CO_(2)emission reduction efficiency of the carbon fixing steel slag-slaked lime brick is 179.4 kg/t,the utilization ratio of steel slag is 238.0 kg/t,and the environmental protection effect is remarkable.

关 键 词：钢渣 固碳 耐久性 

分 类 号：X757[环境科学与工程—环境工程]