Influence of industrial waste pozzolanic additives on the structure and properties of expanded glass granules cement-based composite

Abstract

In this article, the impact of industrial waste pozzolanic additives (spent fluidized bed cracking catalyst waste FCCW and metakaolin from the production of expanded glass granules MW) on the structure and properties of expanded glass granules (EG) cement-based composite (density, compressive strength at 7 and 28 days and shrinkage) was analysed. The surface of the EG was determined to be porous and coated with metakaolin, resulting in the formation of additional hydration products around the EG during the curing of the lightweight cement-based composite. This layer of metakaolin and the open porosity of EG improve the bonding of the granules to the cement matrix of the composite. The analysis of mechanical properties of the lightweight composite showed that the combined pozzolanic additive (FCCW + MW) had the highest compressive strength at 28 days and the lowest drying shrinkage, compared to control samples without industrial waste pozzolanic additives and if they are used separately.