Effect of cullet pozzolanic properties on the compressive strength of cementitious bricks

Abstract

The hardened reactivity and adhesive force of cementitious properties in brick derivation indurates compaction strength and resistant performance during loading. This characteristic is evidenced in the pozzolanic reactivity of cullet-cement adhesion, which influences the brick's performance under compressive loading and resistance at break. The study investigates the behaviour of the cullet in cementitious compositions during compressive force and resistance limit to the load at break. Three supplementary cementitious materials (cullet, river sand, and granite dust) were used to mould 30 specimens of cementitious bricks and water cured for 28 days. These SCMs were mechanically pulverised into the finest particle size density (Kg/m³) for densification characteristic of the bricks and elemental properties were determined through Particle Induce X-ray Emission. The materials were comparatively sole and intermixed with equal cement replacement of 6-10% (SP_1-5) for examination of compaction technique and compressive strength. The study unveiled the pozzolanic reactivity of the cullet, and at a high level of compaction, the resistant capacity of cullet is suitable for brick derivation in civil structures. The adhesive strength of bricks made with cullet and its intermixture have a higher linear resistance with the increase in cement as a stabiliser, but bricks that are made with river sand have a lower linear resistance during compressive loading. The compressive strength of cullet-compacted bricks (CL-CM) for the five specimens1-5 were 1.25, 1.31, 1.37, 1.45, and 1.59MPa respectively. In comparison, river sand (RS-CM) has a strength density of 1.16, 1.23, 1.31, 1.39, 1.47MPa, and granite dust (GD-CM) has a strength density of 1.24, 1.29, 1.37, 1.42, 1.52MPa. An intermixture of cullet induces cement strength at deterioration of river sand specimens (CL-RS-CM) which proved its partial cement replacement in structural solidity of concrete and reduction in carbonic emission of cement