Preparation and Performance Study of Self-leveling Mortar for Desulfurization Gypsum
With desulfurized gypsum as the main cementing material,gypsum based self-leveling mortar whose main properties meet the requirements of relevant standards was prepared by optimizing the composition of the material.Desulphurized gypsum,cement,fine sand,water reducing agent and retarder were mixed in different proportions,and a single factor test was designed to investigate the influence of the amount of each component on the performance of self-leveling mortar with mechanical properties and 30 min fluidity as the test index.The experimental results show that with the increase of water-cement ratio,the fluidity of desulfurized gypsum slurry increases and the mechanical properties decrease.The 30 min fluidity of desulfurized gypsum slurry is increased and the mechanical properties are decreased with the increase of water reducing agent content.The addition of Portland cement can obviously improve the 30 min fluidity,flexural and compressive strength of the paste.With the increase of the content of fine sand,the 30 min fluidity of desulfurized gypsum self-leveling mortar decreases,the bending strength decreases obviously,and the compressive strength decreases obviously when the content of fine sand is 40%.The mechanical properties and 30min fluidity of the optimized desulfurized gypsum self-leveling mortar meet the G20 grade requirements of"Gypsum based self-leveling compound for floor"(JC/T1023-2021).
万方数据
维普
