预养护与碳化时间对泡沫混凝土碳化效果的影响及分析

Influences of Preconditioning and Carbonization Time on Carbonization Effect of Foam Concrete and Analysis

碳矿化技术是封存CO_(2)、解决温室效应问题最直接有效的技术之一。不锈钢渣的主要成分为γ-硅酸二钙(γ-C_(2)S),是一种极具碳化潜力的材料。本研究以质量分数为80%的不锈钢渣和矿粉为主要原料,制备等级为A12干密度的泡沫混凝土,在0.4 MPa、60℃的碳化环境下研究预养护时间和碳化时间对泡沫混凝土抗压强度和固碳率的影响。结果表明,最佳的预养护时间为2 d,预养护1和2 d的泡沫混凝土抗压强度均在碳化3 d后达到峰值,预养护2 d的泡沫混凝土抗压强度比预养护1 d的泡沫混凝土抗压强度提升了51.19%。碳化3 d时,预养护1和2 d的泡沫混凝土固碳率分别为9.94%和12.10%。本研究在简易的碳化环境下,利用工业固废实现碳矿化过程,既大量消纳固废,又封存二氧化碳,具有重要的意义。

Carbon mineralization technology is considered one of the most direct and effective approaches for CO_(2)sequestration and addressing the issue of greenhouse effect.Stainless steel slag,primarily composed ofγ-dicalcium silicate(γ-C_(2)S),possesses significant potential for carbonation due to its composition.In this study,80%(mass fraction)stainless steel slag and granulated blast furnace slag powder were used as main raw materials to prepare A12 dry density grade foam concrete.The effects of preconditioning time and carbonation time on the compressive strength and carbon fixation ratio of foam concrete were investigated in a carbonation environment of 0.4 MPa and 60℃.The results show that the best preconditioning time is 2 d.The compressive strength of foamed concrete with preconditioning 1 and 2 d reaches the peak after carbonization for 3 d.The compressive strength of foamed concrete with preconditioning 2 d is 51.19%higher than that of preconditioning 1 d.When carbonization for 3 d,the carbon fixation ratio of foamed concrete with preconditioning for 1 and 2 d is 9.94%and 12.10%,respectively.In this study,it is of great significance to realize the carbon mineralization process by using industrial solid waste in a simple carbonization environment,which not only consumes a large amount of solid waste,but also stores carbon dioxide.