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

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/m(3), 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.

Automated summary

This study aims to prepare thermal insulating lightweight self-compacting cement composites (LWSCCC) with a density below 1400 kg/m3 using lightweight minerals and aggregates. The inclusion of porous-structured expanded glass aggregate (EGA) increases water demand and the risk of higher water absorption capacity. Partial replacement of EGA with aerogel increases porosity but decreases compressive strength and increases water absorption. However, using aerogel in combination with EGA can achieve a density below 1000 kg/m(3) while maintaining self-compaction ability and adequate strength.