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http://dx.doi.org/10.7844/kirr.2021.30.1.83

Reaction Characteristics of the CAC with Various Gypsum Type and Mixing Ratio  

Choi, Sun-Mi (Eco Friendly Concrete Research Center, Kongju National University)
Kim, Jin-Man (Dept. of Architectural Engineering, Kongju National University)
Koo, Ja-Sul (Technical Research Center, KRT. Co., Ltd.)
Publication Information
Resources Recycling / v.30, no.1, 2021 , pp. 83-91 More about this Journal
Abstract
Ladle furnace slag is a byproduct of the steel-making process, and it contains the mineral β-C2Sandtherapid-settingmineral (dependingonwhichreducingagenthasbeenused). Ladle furnace slag is often treated through slow cooling, which causes the slag to lose its reactivity. In this study, the properties of air-quenched CAC and pulverized ladle furnace slag containing gypsum were evaluated, and the optimal mixing ratio was determined for broadening their usage. Consequently, the properties of CAC aredemonstrated by the dissolution of gypsum after a period of three hours and the content of gypsum after a period of one day. The optimal mixing ratio of anhydrate and hemihydrate gypsum is found to be within 30% and that of dihydrate gypsum is found to be higher than 35%. Furthermore, based on the results of CAC with dihydrate gypsum, the applicability of the by-product dihydrate gypsum has been verified.
Keywords
Ladle Furnace Slag; Slag Atomizing; Rapildy Cooled Slag; Ettringite; Gypsum;
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