Development of New Composites Using Industrial by Products

Abstract

In this paper thesis describes an  experimental investigation of magnesium based cement  mortar which consists of fly ash, magnesium oxide (MgO),  magnesium Phosphate (MgPO4) and Phosphate tailings.  This magnesia based cements are emerged as a viable  alternative to Portland cement, with both technical and  sustainability advantages. This study aims to use the  mixture of cement, fly ash and magnesia. The major  drawback of delayed setting time can be eliminated with the  use of magnesia based cement. Hence, in this study  different admixtures such as magnesium oxide, magnesium  phosphate, phosphate tailings are attempted. Initial and final  setting time of plain cement, fly ash cement and magnesia  based cement are determined and found that the small  dosage of magnesium compound reduced the setting time.  Further, magnesia based cements are reported to be used  along with sea water without much negative effect. In view  of all these, this study proposed a magnesia based cement as  an alternative for conventional Portland cement. Industrial  wastes such as fly ash, and phosphate tailings are used in  this study.