ASSESSMENT OF SELECTED INDICATORS OF PORTLAND CEMENT CONTAINING FLY ASH IN ROAD CONCRETE

Concrete is traditionally made with Portland cement, a powdery substancemade of ground clinker, calcium sulfate, and other minor additives. Clinker productionis energy consuming process. Fly ash, which largely consists of SiO2 and CO, can beused as a substitute for Portland cement, or as a supplement to it. Moreover, fly ashutilization plays an important role in environmentally clean and cost effective powergeneration. The aim of this paper is the study of the physical-mechanical properties ofhardened fly ash - concrete composites with various proportions of fly ash as well asto economic and environmental impact of its using in building industry. The resultsshow that the using of fly ash in road concrete production seems to be the best solutionto reducing consumption of cement including environmental and economic aspects.