Characterization of novel lightweight self-compacting cement composites with incorporated expanded glass, aerogel, zeolite and fly ash

Abstract

This study is aimed at preparing thermal insulating lightweight self-compacting cement composites (LWSCCC) below the density of 1400 kg/m3 by using lightweight minerals and aggregates. Study results showed that incorporation of porous-structured expanded glass aggregate (EGA) enhances the demand for water to maintain the workability and increases the risk of higher water absorption capacity. The use of a portion of aerogel as a replacement of EGA increases porosity by 7.3%, resulting in lowering of compressive strength by 49% and a 7% increase in water absorption capacity. However, the use of aerogel in combination with EGA cement composite can reach a density of less than 1000 kg/m3, maintaining self-compaction ability and adequate strength. The gaps between the cementitious materials and aerogel shown in SEM indicate poor aerogel particle adhesion with cementitious materials. Additionally, X-ray diffraction analysis and thermal conductivity results were analyzed in this study.