Characterization of Different Clay Varieties in Sri Lanka for Industrial Utilizations
Clay is an industrial demanded earth resource because of the exceptional attributes of that clay such as the high porosity, less permeability and deformation. The characterization of different types of clays is a consequential aspect prior of the industrial applications which is also the dominant purport of the existing research. The selected clay types were named as anthill clay, brick clay and roof tile clay because of the industrial applications and formation of such clays. As the characterization stages, the grain sizes, physic- chemical properties of prepared bricks from each type of clay, microstructures of raw clays and the elemental chemical compositions of raw clays were analyzed in order of using sieve analysis methods, standard laboratory methods, optical microscope and X-ray fluorescence (XRF) spectrometer. Basically there were realized some well graded grain pattern from roof tile clay, gap-graded grain pattern from anthill clay and uniformly graded grain arrangement from brick clay, relatively higher tendency in the water absorption and apparent porosity from anthill clay bricks, higher bulk density in brick which were prepared using brick clay, more strengthen of roof tile clay bricks against both compressive and splitting tensile loads, higher coarse particle weight percentage from bricks clays, at least 75% Fe composition in each clay type including Ti, K, Ba, Ca and Zr in the trace amounts from those clays.