Optimizing the particle size distribution of heat-treated boron derivative wastes in cement mortars as portland cement replacements

Abstract

Heat-treated boron derivative wastes (HTBDWs) having three different particle size distributions (PSDs) were used as Portland cement replacements by 25 wt%. In contrast to hypothesis, the smaller median particle size of HTBDW compared to cement decreased the strength of mortars because of lower packing density. The compositions and microstructures of hydration products were similar for all mortars. The higher particle size range of HTBDW reduced strength as only as 6.3% of that of reference mortar. Briefly, applicable cement mortars can be produced by slightly broadening of PSD of non-reactive fillers as cement replacements thanks to their contribution to packing density. (C) 2021 Elsevier Ltd. All rights reserved.