- 目录
- 建筑石膏与胶凝材料
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磷石膏/生土复合调湿材料研究
作者：蔡国俊，陈刚，黄峰，梅江涛，许斌
（中建八局第三建设有限公司，江苏 南京 210046）
摘要：以磷石膏、生土为原材料，经无机掺合料改性，制备磷石膏/生土复合调湿材料。通过试验研究了材料的力学性能、耐水性及调湿性能。结果显示，将磷石膏掺量控制在5%～9%，复合调湿材料的60 d抗压强度为4.48～5.83 MPa；软化系数为0.71～0.82；最大吸湿速率达到0.0472～0.0516 kg/（kg·d）；最大放湿速率达到0.0380～0.0434 kg/（kg·d）。微观分析显示，磷石膏本身具有胶凝作用，无机改性掺合料与原材料中的SiO2反应，生成二水石膏、C-S-H凝胶、伊利石和钙沸石等物质，提高材料的强度和耐水性；复合调湿材料孔隙结构丰富，可通过毛细孔道效应、表面物理及化学吸附对水分子产生作用力，调湿性能优异。
关键词：磷石膏/生土复合调湿材料；抗压强度；软化系数；吸放湿速率
中图分类号：TU526 文献标识码：A 文章编号：1001-702X（2023）02-0096-05
Study on phosphogypsum/raw soil composite humidity-controlling material
CAI Guojun，CHEN Gang，HUANG Feng，MEI Jiangtao，XU Bin
（The Third Construction Co. Ltd.，of China Construction Eighth Engineering Bureau，Nanjing 210046，China）
Abstract：With the effect of inorganic modified admixtures，phosphogypsum/raw soil composite humidity-controlling material was prepared by using phosphogypsum and raw soil as raw materials. The mechanical，water resistance and humidity-controlling properties of the humidity-controlling were explored through experiments. The results show that the composite content of phosphogypsum is controlled at 5%~9%，the 60 d compressive strength of the material is 4.48~5.83 MPa. The softening coefficient is maintained at 0.71~0.82. The maximum moisture absorption and desorption rates reach 0.0472～0.0516 kg/（kg·d） and 0.0380～0.0434 kg/（kg·d） respectively. The microscopic analysis shows that the hydration reaction of phosphogypsum and the reaction of inorganic modified admixture with SiO2 in raw materials produce dihydrate gypsum，C-S-H gel，Illite and Calcium Zeolite，which improves the strength and water resistance. The composite humidity-controlling material has rich pore structure，which can exert force on water molecules through capillary pore effect，surface physical and chemical adsorption，and has excellent humidity-controlling performance.
Key words：phosphogypsum/raw soil composite humidity-controlling material，compressive strength，softening coefficient，moisture absorption and desorption rate