Effect of fly ash from selective catalysic reduction system on mechanical and chemical properties of blended cement paste

Abstract

This research aims to investigates the effect on the mechanical properties of fly ash from the Selective Catalytic Reduction(SCR) process replacement in Portland cement binder. Fly ash was collected from the new installation Mae Moh power plants unit 4-7. The SCR fly ash was used to replace Portland cement by 0% 20% 40% and 60%, respectively. The overall water/binder (w/b) ratio of 0.35 was used in all mixtures. High calcium fly ash, the typical fly ash type,from Mae Moh power plant was used as a control mix for comparison in this research. The X-ray fluorescence analysis. Xray diffraction analysis and Scanning electron microscope were also carried out in this study. The experimental results show that cement paste with SCR fly ash had less compressive strength and less density than that of cement paste with high-calcium fly ash. The cement paste with SCR fly ash replacement of 20 % achieved the best compressive strength, followed by 40% and 60% of the total binder, respectively.