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- 建筑石膏与胶凝材料
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α石膏、β石膏、铁尾矿砂制备自流平砂浆及其性能研究
作者：李青霄1，张心会2，徐开东1，王继娜1，李志新1，刘东洋1
（1.河南城建学院 材料与化工学院，河南 平顶山 467036；
2.河南城建学院 能源与建筑环境工程学院，河南 平顶山 467036）
摘要：以α、β石膏、铁尾矿砂为主要原材料，掺加适量外加剂，设计正交实验，研究α石膏、β石膏、铁尾矿砂、减水剂掺量对砂浆凝结时间、流动度、用水量、收缩率、强度的影响，试配出符合JC/T 1023—2007要求的石膏基自流平砂浆，考虑经济因素，确定砂浆最优配比（g）为：m（α石膏）∶m（β石膏）∶m（铁尾矿砂）∶m（减水剂）∶m（缓凝剂）∶m（保水剂）∶m（可再分散乳胶粉）∶m（消泡剂）=640∶320∶220∶2.12∶4.8∶2.88∶14.4∶0.96。微观分析表明，厚片状和短柱状水化产物数量增加和紧密结构增多使得自流平砂浆强度提高。
关键词：α石膏；β石膏；铁尾矿砂；自流平砂浆；性能研究
中图分类号：TU528.53 文献标识码：A 文章编号：1001-702X（2022）09-0149-05
Study on self-leveling mortar prepared by α，β gypsums and iron tailings sand and its properties
LI Qingxiao1，ZHANG Xinhui2，XU Kaidong1，WANG Ji'na1，LI Zhixin1，LIU Dongyang1
（1.School of Material and Chemical Engineering，Henan University of Urban Construction，Pingdingshan 467036，China；
2.School of Energy and Building Environmental Engineering，Henan University of Urban Construction，Pingdingshan 467036，China）
Abstract：In this paper，taking α gypsum，β gypsum，iron tailings sand as main raw materials，and adding suitable admixture，orthogonal experiment was designed to explore the influences of the dosages of the α gypsum，the β gypsum，the iron tailings sand and the water reducing agent on the setting time，the fluidity，the water consumption，the contraction rate，and the strength of the self-leveling mortar，and the gypsums-based self-leveling mortar meeting the requirements of JC/T 1023—2007 is prepared. Considering economic factors，the optimal matching ratio is determined as follows：α gypsum∶β gypsum∶iron tailings sand∶water reducing agent∶retarder∶water-binding agent∶redispersible emulsion powder∶antifoaming agent is 640∶320∶220∶2.12∶4.8∶2.88∶14.4∶0.96. Microscopic analysis shows that the strength of self-leveling mortar could be improved with the increasing of the number and the dense structures of the thick lamellars and the short columnar hydration products.
Key words：α gypsum，β gypsum，iron tailings sand，self-leveling mortar，property study