Effects of colemanite waste, cool bottom ash, and fly ash on the properties of cement

In this study, the physical and chemical properties of colemanite ore waste from concentrator, coal bottom ash, fly ash, cement+ash mixtures, cement+c olemanite ore waste, and their effects on the mechanical properties of conc rete were investigated. These materials with different proportion were subs tituted with Portland cement. Physical properties such as setting time, vol ume expansion, and compressive strength were determined and compared to ref erence mixture and Turkish standards (TS). The results showed that cement r eplacement materials had clear effects on the mechanical properties. The us e of fly ash and bottom ash even at the concentration of 25% showed either comparable or better result compared to reference mixture. Although replace ment of Portland cement by 9 wt.% of colemanite ore waste causes reduction in the compressive strength, the values obtained are within the limit of TS . As a result, colemanite ore waste, fly ash, and bottom ash may be used as cementitious materials. (C) 2001 Elsevier Science Ltd. All rights reserved .