Abstract

Abstract

In this research, steel furnace slag, fly ash and new synthesized polycarboxylate was used to replace cement in concrete composition. Concrete was made in three grades of 400, 450 and 500 using steel furnace slag, fly ash and polymer with different percentages of dry weight. Also, the amount of water to cement was selected as one of the effective parameters in concrete strength and production costs. The results showed that slag percent had a positive effect on improving samples strength. Also, increasing the percentage of polycarboxylate and decreasing the amount of water per cement ratio increased the strength of concretes. Finally, by examining the effect of several parameters on the strength of concrete, an economic evaluation was performed to manage the cost of increasing the strength of concrete. The results also indicated that with increasing percentage of resistance, the amount of costs increased in all three grades ; 400, 450 and 500.

Abstract

Experiments on the development of compressive strength and static and dynamic Young’s moduli were performed by the following mix proportions of concrete: the first uses different types of Portland cement without fly ash (FA) with a water-cement ratio of 45%, keeping at different curing temperatures; the second partially use FA in place of the cement, with the other conditions same as above; the third uses only blast furnace cement B instead of Portland cement. With these specimens, we comparatively examined in terms of temperature adjusted concrete age, how the mechanical properties change with the use of cement only, FA replacement for cement and with variation in curing temperatures. As a result, it was confirmed that the replacement of cement by fly ash enhanced the long-term mechanical properties of concrete regardless of the curing temperature applied in this experiment.

Abstract

Abstract

Abstract