Research on effects of FGD forms to supersulfated cement properties

Abstract

This paper presents the possibility of using FGD gypsum (Flue-Gas Desulfurization) as a raw material for the production of supersulphated cement (SSC) that meets BS EN 15743:2010+A1:2015, and also studies the effects of existing forms of FGD to the properties of this cement. Research results show that heat-activated FGD has a good effect on the strength development of cement. At the same time, the samples are also resistant in  sulphate and seawater environment. The test results of mineral composition and microstructure of cement paste showed that: the main hydration products are ettringite, gypsum and a part of C-S-H minerals. The heat of hydration of the test samples all met the requirements of low heat or very low heat emission according to TCVN 7712:2013, the drying shrinkage of samples met the requirements of TCVN 9501:2013.