Performance study of new lightweight cementitious composites with glass beads as filler

Abstract

Glass beads are a kind of inorganic lightener material with low density and high strength. They can be used to prepare lightweight cement composite and significantly improve traditional cement materials' fluidity, compressive, and flexural properties after setting. In this paper, a new lightweight cementitious hole sealing material was prepared by utilizing the excellent properties of glass beads, and the new lightweight cementitious composite drilled hole sealing material was quantitatively and qualitatively analyzed by flow test, uniaxial compression, nuclear magnetic resonance, and SEM experiments, to derive the effects of the substitution of different types of glass beads with different proportions of different types of glass beads on the material's fluidity, compressive strength, pore distribution, and microstructure. The results show that the new cementitious materials have better fluidity, in which the fluidity of the optimal group is increased by 8% compared with that of pure cement mortar; the mechanical properties of the optimal group are significantly improved with the hollow glass beads acting as the aggregate, and the peak stress reaches 55.025 MPa; the peak stress can reach 60.191 MPa with the use of modified hollow glass beads acting as the aggregate; moreover, with the incorporation of hollow glass beads, the material is more compact, and the pore distribution and microstructure of the material is improved. In addition, with the incorporation of hollow glass beads, the densification of the material showed a trend of first enhancement and then a gradual decrease, while the densification of the material weakened after the incorporation of solid glass beads. Therefore, hollow glass beads are more suitable for improving and optimizing cementitious sealing materials. The research and development of this material are conducive to improving cementitious materials' sustainability and alleviating the cement production's environmental burden. At the same time, it provides a reference for the research and development of new high-quality cementitious materials.