Effect of modifier and superfine steel slag powder on properties of magnesium oxysulfate (MOS) cement

Abstract

With the increasing of iron and steel production, the rational utilization of waste steel slag is very important. At present, it is common to use steel slag as admixture of Portland cement and concrete. In order to further investigate the effect of modifier and superfine steel slag powder on properties of magnesium oxysulfate (MOS) cement, the examinations of compressive strength, hydration products, and pore structure of various MOS cement mixtures are discussed in detail. The results show that malic acid helps the formation of 5Mg(OH)2·MgSO4·7H2O (517 phase) and gives MOS cement a finer pore structure. Addition of superfine steel slag powder can decrease the porosity and fine the pore size in the paste.

Keywords

• steel slag
• magnesium oxysulfate cement
• compressive strength
• x-ray analysis
• pore structure