碳化作用
材料科学
熔渣(焊接)
冶金
浸出(土壤学)
微观结构
磨细高炉矿渣
抗压强度
复合材料
水泥
环境科学
土壤科学
土壤水分
作者
Shuo Yang,Liwu Mo,Min Deng
标识
DOI:10.1016/j.cemconcomp.2021.103948
摘要
Artificial steel slag aggregates were prepared via accelerated carbonation with the assistance of EDTA. The influences of EDTA on the CO 2 uptake, microstructure, and properties of the carbonated steel slag aggregates as well as the performance of concrete were investigated. With the addition of EDTA, the carbonation of steel slag aggregates was enhanced, yielding increases in CO 2 uptake, quantity of formed CaCO 3 and bulk density whereas reduction in the crushing value. Moreover, EDTA improved the volume stability of the steel slag aggregate. The EDTA played a role as a catalyst in the process of steel slag carbonation, which chelated the calcium leached from steel slag and hence accelerated the calcium leaching. This hence increased the carbonation efficiency and carbonation degree of steel slag. Concretes cast with the steel slag aggregates modified by EDTA gained higher compressive strengths and more stable volumes than that of concretes cast with the steel slag aggregates without EDTA.
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