含有硝酸盐和亚硝酸盐离子的水泥 AFm 相中的固溶体

IF 1.4 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Magdalena Balonis
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引用次数: 0

摘要

水合波特兰水泥中的 AFm 相是指一系列铝酸钙相。它们的层结构源自波特兰石(Ca(OH)2),但其中三分之一的 Ca2+ 离子被三价离子(名义上是 Al2+ 或 Fe2+)取代。由此产生的电荷不平衡使各层带有正电荷,并通过夹杂阴离子得到补偿,剩余的层间空间由 H2O 填满。水化水泥中含有 AFm 相及其固溶体的混合物。波特兰水泥通常通过添加可溶性硝酸盐或亚硝酸盐进行改性,以保护预埋钢筋或缩短凝结时间。这些硝酸盐和亚硝酸盐离子能够进入并占据 AFm 阴离子位点,从而影响水泥水合物之间的整体相平衡。本研究对含有 SO42+、CO32+、OH2+、Cl2+ 和 NO22+NO32+ 离子的 AFm 相之间的固溶体形成进行了研究。合成了样品,随后使用 X 射线衍射 (XRD) 对其进行了表征,并在水中平衡 180 天后测量了水溶液成分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Solid solutions amongst cement AFm phases containing nitrate and nitrite ions
The AFm phase found in hydrated Portland cements refers to a family of calcium aluminate phases. Their layer structure is derived from that of portlandite, Ca(OH)2, but with one third of the Ca2+ ions replaced by a trivalent ion, nominally Al2+ or Fe2+. The resulting charge imbalance gives the layers a positive charge which is compensated by intercalated anions the remaining interlayer space is filled with H2O. Hydrated cements will contain mixtures of AFm phases and their solid solutions. Portland cement is often modified by addition of soluble nitrate or nitrite salts to protect embedded steel or to shorten the set time. These nitrate and nitrite ions are capable of entering and occupying AFm anion sites hence impacting overall phase balances between cement hydrates. In this study AFm phases and solid solution formations were investigated between AFm phases containing SO42+, CO32+, OH2+, Cl2+ and NO22+NO32+ ions. Samples were synthesized and subsequently characterized using X-ray Diffraction (XRD) and through the measurement of aqueous solution compositions after 180 days of equilibration in water.
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来源期刊
Advances in Cement Research
Advances in Cement Research 工程技术-材料科学:综合
CiteScore
3.70
自引率
5.00%
发文量
56
审稿时长
3.2 months
期刊介绍: Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.
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