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三乙醇胺对水化过程中水泥浆体液相离子浓度的影响
作者:孔祥明 路振宝 闫娟 刘辉 王栋民 
单位:1. 土木工程安全与耐久教育部重点实验室 清华大学土木工程系 北京 100084 2. 北京市功能性高分子建筑材料工程技术研究中心 北京市建筑工程研究院有限责任公司 北京 100039 3. 中国矿业大学化学工程系 北京 100083 
关键词:三乙醇胺 水泥浆体 离子浓度 络合 钙离子 
分类号:TU528.042.3
出版年,卷(期):页码:2013,41(7):981-986
DOI:
摘要:

采用电感耦合等离子体发射光谱仪(ICP–OES)测定水化过程中水泥浆体液相中元素组成,研究三乙醇胺(triethanolamine,TEA)对水泥浆体液相中离子浓度的影响。结果表明:TEA的加入明显提高了水化过程中水泥浆体液相中的Fe、Ca和 Al的浓度,同时提高了S、Si和OH–的浓度。另外,水化热测试表明:0.1%掺量的TEA提高了水泥第一个水化放热峰,延长了水泥水化诱导期。采用总有机碳测试法跟踪测试TEA加入到水泥浆体后,在浆体液相中的浓度变化,结果发现:TEA的消耗主要发生在水泥水化加速期,表明TEA通过化学反应或物理吸附进入了水泥水化产物中。将TEA加入到饱和Ca(OH)2溶液及含有Ca(OH)2沉淀的饱和Ca(OH)2溶液中,对溶液电导率的测试证实了TEA可以和钙离子形成络合物的推测。
 

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The influence of triethanolamine (TEA) on the elemental concentrations in the aqueous phase of hydrating cement pastes was investigated via inductively coupled plasma atomic emission spectroscopy (ICP–OES). The results show that the TEA increases the concentrations of Fe, Ca, and Al, as well as those of S, Si, and OH– in the aqueous phase of the fresh pastes. The isothermal calorimetry experiment indicates that the TEA addition of 0.1% increases the first peak of cement hydration and extends the induction period. The total organic carbon (TOC) results show that the TEA in the aqueous phase of the hydrating cement pastes is rapidly consumed in the acceleration period of cement hydration, suggesting that TEA could be incorporated into the hydration products via either chemical reaction or physical adsorption. The measurement of conductivity of saturated Ca(OH)2 solution confirms the formation of the complex between the TEA and calcium ions.
 

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基金项目:
国家自然科学基金(51173094)资助项目。
作者简介:
第一作者:孔祥明(1974—),男,博士,副研究员。
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参考文献:

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