The Compressive Strength of Cement–Slag–Calcium Sulphoaluminate Ternary System

Abstract

At present, there is an increasing interest on the use of calcium sulphoaluminate (C 4 A 3 $) in cement. In this paper, pure mineral of sulphoaluminate (C 4 A 3 $) was prepared in laboratory. Different dosages of steel slag and C 4 A 3 $ were blended into cement. The aim of this paper is to investigate the compressive strength of this ternary system. The test results show that the addition of C 4 A 3 $ can improve the strength of cement. Larger C 4 A 3 $ dosage (7%) may reduce the 28 days strength. The optimal C 4 A 3 $ dosage is 5%. In ternary system, C 4 A 3 $ has no obvious improvement, while 5% dosage could improve the strength a little.