Utilização dos produtos da combustão do carvão mineral como aditivos na produção de argamassa para revestimento

Abstract

The use of residues as alternative materials has proven successful according to several investigations. Coal combustion products (CCPs) is a residue that causes environmental impact, but it has a great potential for use in civil engineering construction in the production of mortars and concrete. It posesses a high content of silica (SiO2) and so it can be used as pozzolan. This research aimed to verify the viability of adding coal combustion products to mortars for bricklaying and covering. The raw materials were submitted to physical, and chemical characterization. CCPs were also rated according to their pozzolanicity. Reference mortars were prepared, as well as mortars containing 10, 20, 30, 40 and 50% amounts of CCPs as a partial replacement for cement. After curing time of 7 and 28 days, prismatic samples were tested to determine their tensile strength in bending and their compression strength. Moreover, the mortars were subjected to X-ray diffraction, scanning electron microscopy and determination of water absorption, voids and apparent density. The results obtained were consistent with literature data, showing that application of coal combustion products in the construction industry is a viable alternative.