Synthesis and Characterization of High Strength Sand using Bauxite

Abstract

High-strength sand often refers to sand that has been processed or selected for certain properties that enhance its strength or performance in various applications. Sand usage is more, which makes the issue worse, resulting in negative effects like erosion of riverbanks, damage to aquatic habitats, and a drop in the water table. There is an immediate demand for conventional granular alternatives to support the construction industry. In this connection, investigations were carried out on unconfined compressive strength test for 4M, 6M, and 8M NaOH for molarity optimization. Synthesized raw bauxite granules were prepared using 6M NaOH solution at 110°C for 1hr and the granules produced were used as an alternative for natural river sand. The granulated material was assessed for its physical (specific gravity, water absorption, particle size distribution, Atterberg limits), chemical (pH, electrical conductivity, total dissolved solids, and engineering (direct shear test) properties, compared to conventional river sand (RS). Further, the materials were investigated through microlevel analysis by using x-ray diffraction, x-ray fluorescence & scanning electron microscopy analysis. In addition, a compressive strength test was performed on SRBG and RS mortar. It was noted that SRBG mortar attained higher strength than RS mortar. Based on the experimental investigations and microanalysis, it can be concluded that SRBG granules have the potential for use as a substitute to natural river sand.