硬石膏自流平地面材料配方试验探索

Research and preparation of self-leveling floor mortar from anhydrite

以硬石膏为主要材料，添加不同外加剂、骨料等对其进行改性处理，制得硬石膏自流平地面材料。配方设计为：硬石膏60％～90％，激发剂10％～40％，减水剂0．25％～1．00％，胶粉0～3％，保水剂0．05％～0．10％，粉煤灰0～5％。经测试，硬石膏自流平地面材料的流动度达220mm，抗折强度为7．3MPa，抗压强度为16．7MPa，拉伸粘结强度为0．57MPa，收缩率为0．045％，性能符合日本住宅公团标准要求。

Based on anhydrite,a new kind of self-leveling floor mortar was developed with different additives and aggregate through modification. The optimization formula was：anhydrite 60%~90%,complex activator 10%-40%,superplastieizer 0.25%-1.00%, redispersible polymeric powder 0~3%,water-retaining agent 0.05%~0.10% and fly ash 0-5%. Test results show that the fluidity was 220 mm,the flexural and compressive strength of the mortar reached 7.3 MPa and 16.7 MPa respectively and the tensile adhe- sive strength was 0.57 MPa with the shrinkage ratio of 0.045%. The property of anhydrite has reached Japan standard of Residen- tial Group and Housing Corporation about gypsum-based self-leveling mortar.