Utilization of remained mud from process of coal wastes Zarand company as an additive to cement

In the present work the possibility of utilization of remained mud of alumina extraction process from wastes of Zarand coal washing plant as an additive to cement was investigated. According to the chemical characteristics of mud, it was found that it is not possible to use the mud as cement raw materials. Therefore the main effort in this project was focused on the using the mud as an additive to the cement. Because of this the amounts of 2, 3, 5, 10, 15, 20, 25 and 30 wt% of mud were added to cement type 2 (as control sample).Parameters of alkali, L.O.I, free lime, and fineness of cement mixtures (blain) were measured, also cement mortar molds based on the ASTM C 109 were made. Primary and final setting ,compression strength and volume expansion of them after 2, 3, 7, 28 and 90 days were determined. It must be mentioned that in order to compare the results a mixture of 20wt% Pozzolan with 80wt% cement and control sample was made. The cement mortar resistance against diffusion of chloride was determined based on the ASTM C 1202 .