Evaluation of rheological and mechanical properties of bottom ash based masonry mortar with graphene oxide

Abstract

This paper evaluates the rheological and mechanical properties of lignite based bottom ash as fine aggregate in cement mortar with GO as an additive. The annual extraction of such a huge amount of bottom ash needs a massive transfer to the field, as it constitutes a threat to the environment. The utilization of such residue as a partial replacement of fine aggregate in masonry mortar is not fully explored. Hence, an attempt has been made to utilize the bottom ash as FA in cement mortar composites, and studied the influence of graphene oxide (GO) in the properties of mortar matrix. In this study, bottom ash replacement from 0 to 60% and GO at dosage of 0.1, 0.15 and 0.20% by weight of cement were used. Compressive and flexural strengths of composites were improved significantly at GO = 0.15%. Mechanical properties at 40% bottom ash replacement level only have shown minor improvement. It was observed from the flow table test that addition of bottom ash leads to reduction in workability of masonry mortar, and GO enhanced both the rheological and mechanical properties of mortar matrix.