THE EFFECT OF CALCINATION TEMPERATURE ON THE CHEMICAL COMPOSITION OF OYSTER, PERIWINKLE AND SNAIL SHELL ASH

Anieti-mfon E. Inyang, Benjamin R. Etuk

Abstract: Mollusk shells of oyster, periwinkle and snail were ashed at temperatures of 900°C, 1000°C, 1200°C, 1400°C, 1600°C. The resulting ash which are known to be pozzolanic in nature were analyzed for the clinker compounds using the x-ray florescence method and the Bougue equations. The results show that the three mollusk shell ashes at all the ashing temperatures studied had high concentration of tricalcium silicate (C3S) of between 178.77-232.43% and low concentration of tricalcium aluminate (C3A) and tetracalcium aluminoferrite (C4AF) of up to 0.14% and 1.22% respectively. Dicalcium silicate (C2S) was not present in detectable concentration. The low concentrations of the clinker compounds may be attributed to the low quantity of SiO2, Al2O3, SO3 and Fe2O3 in all the ashes at the temperatures studied.

Keywords: Cement, Concrete, Admixtures, Mollusk Shells, Waste Utilization, Cement Replacement Materials

DOI: https://doi.org/10.15623/ijret.2016.0508036