Study on application of gypsum-based self-leveling mortar in floor heating backfill

Abstract In this paper, gypsum-based self-leveling mortar is prepared by using desulfurization gypsum-based α-high strength gypsum as the main cementing material, and it is applied to the floor heating backfill. Comparing with cement-based self-leveling mortar, the thermal conductivity coefficient, thermal expansion coefficient, elastic modulus and other performance indexes of gypsum-based self-leveling mortar are studied. The results show that the gypsum- based self-leveling mortar prepared based on α-high strength gypsum has high strength and heat conduction. Good physical performance, good volume stability, low thermal expansion rate are suitable for floor heating. The application of the gypsum-based self-leveling mortar in the floor heating project shows that the gypsum-based self-leveling mortar can simplify the construction process and shorten construction time.