- 目录
- 建筑石膏与胶凝材料
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减水剂对建筑石膏水化硬化的影响
作者：李华志1，李韶岗2
（1.西安航空学院，陕西 西安 710077；2.中冶京诚工程技术有限公司，北京 100176）
摘要：研究了减水剂种类及掺量对建筑石膏工作性、水化进程及强度等的影响，从而明确不同种类减水剂对建筑石膏适应性以及减水增强效果。结果表明，萘系FDN对建筑石膏减水作用的效率较低，且加快石膏水化进程，大幅缩短凝结时间，增大浆体流动度经时损失，增强效果较一般；而聚羧酸系Point-S的减水效率较高，且延缓石膏水化进程，大幅延长凝结时间，减小浆体流动度经时损失，增强效果较好，其临界掺量仅为0.5%，此时石膏抗压强度增幅高达75%。
关键词：建筑石膏；减水剂；工作性；水化温升；强度
中图分类号：TU526；TQ177.3+77 文献标识码：A 文章编号：1001-702X（2019）07-0049-04
Effect of water reducing agent on hydration and hardening of building gypsum
LI Huazhi1，LI Shaogang2
（1.Xi'an Aeronautical University，Xi'an 710077，China；
2.Capital Engineering & Research Incorporation Limited，Beijing 100176，China）
Abstract：This paper investigated the effect of water reducing agent types and dosages on the workability，hydration process and strength development of building gypsum，which aimed to understand the adaptation and enhancement effect of different types of water reducing agent in this gypsum. The results indicated that naphthalene water reducing agent（FDN） showed an ineffective
reducing effectiveness. FDN increased the hydration process and shortened the setting time，while time-dependent workability loss. On the other hand，polycarboxylate superplasticizer（Point-S） gave a higher water reducing effectiveness which delayed the hydration process. The setting time was prolonged by using Point-S and the time-dependent workability loss was also reduced. The critical dosage was 0.5% and gave a 75% increase of compressive strength.
Key words：building gypsum，water reducing agent，workability，temperature rise of hydration，strength