- 目录
- 建筑石膏与胶凝材料
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石膏基自流平材料的性能研究
作者：向仁科1，石宗利2
（1.株洲市产商品质量监督检验所，湖南 株洲 412000；2.长沙归一新材料科技股份有限公司，湖南 长沙 410000）
摘要：以脱硫石膏和氟石膏为基本，通过加入矿渣、水泥、激发剂、减水剂、保水剂、乳胶粉和消泡剂等进行复合改性，配制成石膏基自流平材料，其绝干抗折和抗压强度分别达到6.8 MPa和30.6 MPa，软化系数为0.85，所测性能指标均优于JC/T 985—2017《地面用水泥基自流平砂浆》和JC/T 1023—2021《石膏基自流平砂浆》的要求。采用XRD和ESEM分析方法研究了石膏基自流平材料的高强、耐水机理。结果表明，该自流平材料综合性能优良；以二水石膏与钙矾石为结构骨架，水化硅酸钙（C-S-H）凝胶为粘结剂的致密结构决定了材料的高强、耐水的性能；有利于脱硫石膏和氟石膏的资源化利用。
关键词：自流平；脱硫石膏；氟石膏；硅酸钙凝胶（C-S-H）
中图分类号：TU56+4.6 文献标识码：A 文章编号：1001-702X（2022）06-0028-04
Study on properties of gypsum-based self-leveling material
XIANG Renke1，SHI Zongli2
（1.Zhuzhou Institute for Product Quality Supervision and Inspection，Zhuzhou 412000，China；
2.Changsha Guiyi New Material Technology Co. Ltd.，Changsha 410000，China）
Abstract：A gypsum-based self-leveling material was prepared by utilizing FGD gypsum and fluorgypsum as basic material and adding slag，cement，activator，water-reducing agent，water-retaining agent，emulsion powder and defoamer to be modified. The dry breaking strength and compressive strength of the self-leveling material are 6.8 MPa and 30.6 MPa respectively，and the softening coefficient is 0.85，the measured performance indexes are better than the requirements of JC/T 985—2017"Cementitious self-leveling compound for floor" and JC/T 1023—2021"Gypsum based self-leveling compound for floor". The article researches the mechanism of high strength and water resistance of gypsum-based self-leveling material by using the XRD and ESEM analytical methods. The results show that the self-leveling material has excellent comprehensive properties. The structural framework of dihydrate gypsum and ettringite and the compact structure of using C-S-H gel as binder determine the high strength and water resistance. It is beneficial to the resource utilization of desulphurized gypsum and fluorinated gypsum.
Key words：self-leveling，FGD gypsum，fluorgypsum，calcium silicate hydrate gel（C-S-H）