- 目录
- 建筑石膏与胶凝材料
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复合型石膏在净浆和自流平砂浆中的性能研究
作者：杨奇玮1，杨新亚2，王义恒1，李莎1
（1.华新水泥股份有限公司，湖北 武汉 430073；
2.武汉理工大学 材料研究与测试中心，湖北 武汉 430070）
2.武汉理工大学 材料研究与测试中心，湖北 武汉 430070）
摘要：研究了固氟脱酸处理后的氟石膏与α型半水石膏复合对净浆和自流平砂浆流动性、胶凝性能和力学性能的影响规律。结果表明：改性氟石膏与α型半水石膏的质量比为45∶55时，净浆的流动性能与力学性能最佳。随着改性氟石膏掺量增加，改性氟石膏早期水化速率较慢，24 h抗压强度出现下降趋势；随着龄期的延长，改性氟石膏进一步水化，晶体结构逐渐致密，7 d绝干抗压强度在38～50 MPa。石英砂掺量20%制备的复合型石膏基自流平砂浆的24 h抗折和抗压强度分别为3.2、12.1 MPa，30 min流动度损失为2 mm，符合JC/T 1023—2007《石膏基自流平砂浆》的要求。
关键词：改性氟石膏；α型半水石膏；净浆；自流平砂浆
中图分类号：TU526 文献标识码：A 文章编号：1001-702X（2020）08-0082-04
Research on performance of composite gypsum on properties of paste and self-leveling mortar
YANG Qiwei1，YANG Xinya2，WANG Yiheng1，LI Sha1
（1.Huaxin Cement Co. Ltd.，Wuhan 430073，China；
2.Center for Material Research and Analysis，Wuhan University of Technology，Wuhan 430070，China）
Abstract：In this article，the performance of modified fluorgypsum and α-hemihydrate gypsum on the fluidity，cementitious and mechanical properties of paste and self-leveling mortar was investigated. The results showed that when the ratio of modified fluorgypsum and α-hemihydrate gypsum was 45∶55，the mortar obtained the best flow and mechanical properties. The early stage hydration speed of anhydrite decreased with increase of the content of modified fluorgypsum and 24 h compressive strength was occurred on downward trend. With the increase of age，the modified fluorgypsum was further hydrated，the crystal structure of the hydrated paste was gradually consolidated and the 7 d absolutely dry compressive strength of the hydrated paste ranged from 38 to 50 MPa. 24 h flexural strength and compressive strength of the composite of self-leveling mortar based on composite gypsum containing 20% of quartz sand could achieve 3.2 MPa and 12.1 MPa separately and its loss of fluidity after 30 min was 2 mm. Its performance could meet the relevant requirement of the standard JC/T 1023—2007 "Gypsum-based self-leveling mortar".
Key words：modified fluorgypsum，α-hemihydrate gypsum，paste，self-leveling mortar