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浙江大学学报(工学版)
J4  2009, Vol. 43 Issue (7): 1322-1326    DOI: 10.3785/j.issn.1008-973X.2009.
材料与化学工程     
Na2C2O4对硬石膏水化硬化的影响及作用机理
彭家惠1, 2,张建新2,陈明凤2,瞿金东2,李青2
（1. 重庆大学 国家镁合金材料工程技术研究中心,重庆 400044；2. 重庆大学 材料科学与工程学院, 重庆 400045）
Influence of Na2C2O4 on hydration and hardening of anhydrite and its action mechanism
PENG Jia-hui1,2, ZHANG Jian-xin2, CHEN Ming-feng2, QU Jin-dong2, LI Qing2
(1. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;
2. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China)
 全文: PDF(872 KB)  
摘要：

研究了草酸钠对硬石膏水化进程、硬化体显微结构与强度、液相离子浓度与二水石膏析晶过饱和度的影响,从二水石膏晶体成核与生长的角度探讨了草酸钠的作用机理.草酸钠使硬石膏水化率提高,水化热集中,水化潜伏期缩短,水化进程加快；草酸钠使二水石膏晶体细化,硬化体结构致密,强度提高,是硬石膏水化活性的高效激发剂.草酸钠作用机理归纳为：草酸钠与硬石膏反应形成草酸钙沉淀与可溶硫酸盐,使液相SO2-4浓度大幅提高；提高二水石膏析晶过饱和度,使二水石膏临界晶核半径减小,晶体成核与生长速率加快；草酸钠促进硬石膏溶解.
关键词： 硬石膏;  草酸钠;  激发剂;  水化硬化    
Abstract:

The influence of sodium oxalate on anhydrite hydration process and crystal morphology of its dihydrate products was studied by determination of the hydration rate, hydration temperature and ion concentration in the liquid phase of anhydrite in combination with the investigation of the microstructure of the hardened paste. The activation mechanism of sodium oxalate was analyzed from the standpoint of the crystal growth of gypsum. The addition of Na2C2O4 increased the hydration rate of anhydrite, concentrated the hydration heat, shortened the hydration latency period, and accelerated the hydration process, accordingly leading to the refinement of gypsum crystal,the compactness of hardened gypsum paste, and the increases of its strength, so it was a highly efficient activator of anhydrite hydration. The activating mechanism of sodium oxalate could be summarized as follows: sodium oxalate reacted with anhydrite, and calcium oxalate precipitation and soluble sulfate salt were then formed, which increased the SO2-4 concentration in the liquid phase, and increasing the supersaturation degree of gypsum crystallization decreased the critical nucleus radius of dehydrate gypsum, and it accelerated the crystal nucleation and growth, and sodium oxalate accelerated the dissolution of anhydrite．
Key words: anhydrite    sodium oxalate    activator    hydration and hardening
出版日期: 2009-08-01
:  TU522.09  
基金资助:

国家自然科学基金资助项目（50572126）.
作者简介: 彭家惠（1962-）,男,重庆人,博士,教授,主要从事建筑材料与建筑节能方面的研究.
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引用本文:

彭家惠, 张建新, 陈明凤, 等. Na2C2O4对硬石膏水化硬化的影响及作用机理[J]. J4, 2009, 43(7): 1322-1326.

BANG Jia-Hui, ZHANG Jian-Xin, CHEN Meng-Feng, et al. Influence of Na2C2O4 on hydration and hardening of anhydrite and its action mechanism. J4, 2009, 43(7): 1322-1326.

链接本文:

http://www.zjujournals.com/xueshu/eng/CN/10.3785/j.issn.1008-973X.2009.    或    http://www.zjujournals.com/xueshu/eng/CN/Y2009/V43/I7/1322

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