Preparation and Properties of Alkali Stimulated Geopolymer and its Application in Thermal Insulation Coating
Geopolymer was prepared by Metakaolin (MK) stimulated by sodium silicate and sodium hydroxide. X-Ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize micro-structure of geopolymer and geopolymer based coating. A serial of reagents were added to modify the coating and a thermal insulation material was produced. It was revealed that MK has quasi-crystal structure and the produced geopolymers had amorphous structure. The surface of geopolymer based coating, as well as the compressive strength, adhesive strength with concrete, could be modified by adding a certain amount of silane coupling agent, mica powders and wollastonite. By mixing the asprepared geopolymer and hollow glass beads with a volume ratio of 4:1, a thermal inslation coating was produced, which had a promising application in the surface protection of hydropower dam.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
L. Chen et al., "Preparation and Properties of Alkali Stimulated Geopolymer and its Application in Thermal Insulation Coating", Advanced Materials Research, Vols. 233-235, pp. 2443-2446, 2011