Wensheng Zhang, Jiangtao Zhang, Jiayuan Ye, Xuehong Ren, Lei Liu, Weiguo Shen
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引用次数: 1
摘要
铝酸钠(NaAlO2)可促进硅酸盐水泥的水化。在这里，我们比较了NaAlO2溶液和去离子水对al掺杂β-C2S水化的影响。研究了水合掺al β-C2S水化产物C-S-H的微观结构发展。NaAlO2通过增强氢氧化钙的沉淀和刺激C-(A)- s - h成核，显著改善了al掺杂β-C2S的水化动力学，提高了al掺杂β-C2S膏体的早期机械强度。NaAlO2促进了Al在C-(A)- s - h结构中的结合，加速了C-(A)- s - h相的形成，其组成中含有四配位、五配位和六配位Al。碱阳离子改变了C-(A)- s - h的静电平衡，从而促进了纳米力学性能的发展。
Hydration kinetics and microstructure development of normal and NaAlO2-activated Al-doped β-C2S pastes
Sodium aluminate (NaAlO2) can be used to accelerate hydration of Portland cements. Here, we compare the use of NaAlO2 solutions with deionized water on the hydration of Al-doped β-C2S. The microstructure development of hydration product C-S-H obtained from hydrated Al-doped β-C2S was investigated. NaAlO2 significantly improved the hydration kinetics of Al-doped β-C2S due to the enhancement in the precipitation of calcium hydroxide and stimulation of C-(A)-S-H nucleation and increased the early-age mechanical strength of Al-doped β-C2S pastes. NaAlO2 promoted the incorporation of Al in the C-(A)-S-H structure and accelerated the formation of C-(A)-S-H phases containing tetra-, penta- and hexa-coordinated Al in its composition. The alkali cations modified the electrostatic equilibrium of the C-(A)-S-H, thus promoting the development of the nano-mechanical properties.
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The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials.
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