RECOVERY OF ASH FROM LIGNOCELLULOSIC WASTE IN THE CEMENT INDUSTRY
Keywords:
eco-cements, resistance, mortar, rice husks, compression, bendingAbstract
In this research we have targeted three objectives: an economic objective of minimizing energy expenditure, a technological objective of manufacturing a new cement by improving the mechanical performance of ordinary Portland cement, and an ecological objective of minimizing the resulting CO2 emissions from the decomposition of carbonates during cooking. To achieve these objectives, we have developed a new cement composed of a partial substitution of clinker with artificial pozzolans rich in silica, obtained by treatment of lignocellulosic residues, in this case rice husk ashes. This substitution is added to the clinker with percentages ranging from 25 to 75%. These substitutions were chosen based on the presence of silica that can react with portlandite (Ca(OH)2) resulting from the hydration of the cement, forming more C-S-H which improves the mechanical properties of the cement. The pozzolanic activity of these substitutions was examined by chemical analyzes and mechanical tests on mortar test pieces. Other techniques, namely X-ray diffraction (XRD), were used to visualize the pozzolanic power of the substitution used. Improving this reactivity is obtained by calcining these additions at temperatures of 750°C. This significantly reduces the CO2 emissions that accompany the production of Portland cement clinker.
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