碱氢氧化物对高掺量粉煤灰水泥浆水化动力学和微观结构的影响

IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Muhammad Riaz Ahmad , Satya Medepalli , Tiao Wang , Jian-Guo Dai , Yuqian Zheng , Tetsuya Ishida
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引用次数: 0

摘要

通过两种混合方法探讨了 NaOH 对高体积粉煤灰混合物中孔隙结构、反应动力学、体积和反应产物形态的影响:(i) 在水泥-FA 粉末中直接加入 0.2 M、0.5 M 和 1.0 M NaOH 溶液,以及 (ii) 在与水泥混合前将 FA 预溶解到 NaOH 溶液中。预溶解技术通过提高硅的释放量来改善龄期早期的力学性能,有助于加速析出额外的 C-A-S-H 凝胶。这两种方法都提高了 FA 反应和铝酸盐/白云石水化程度。然而,1.0 M NaOH 会对强度和微观结构性能产生负面影响,因为会形成不良的二氧化硅凝胶、C-A-S-H 凝胶碳化和毛细孔体积增大。NaOH 浓度影响了 C-A-S-H 凝胶的堆积密度,高 pH 体系表现出松散的片状堆积。低 pH 值和高 pH 值体系中 C-A-S-H 凝胶的 Ca/Si 随着固化时间的增加而变化,低 pH 值体系在 90 天时表现出较高的 Ca/Si。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of alkali-hydroxide on hydration kinetics and microstructure of high-volume fly ash blended cement pastes

The influence of NaOH on pore structure, reaction kinetics, volume, and morphology of reaction products in high-volume-fly-ash mixtures was explored by two mixing methods: (i) direct addition of 0.2 M, 0.5 M and 1.0 M NaOH solution into cement-FA powder, and (ii) pre-dissolving FA into NaOH solution before mixing with cement. The pre-dissolution technique improved early-age mechanical performance by enhancing Si release, aiding the expedited precipitation of extra C-A-S-H gel. Both methods improved the degree of FA reaction and alite/belite hydration. However, 1.0 M NaOH negatively affected the strength and microstructure properties due to undesirable silica-gel formation, C-A-S-H gel carbonation, and increased capillary pore volume. NaOH concentration has affected the packing density of C-A-S-H gel, where high-pH systems exhibit loosely packed sheet-like clusters. Ca/Si of C-A-S-H gel in low and high pH systems evolved with increased curing age, with low pH system exhibiting high Ca/Si at 90 days.

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来源期刊
Cement and Concrete Research
Cement and Concrete Research 工程技术-材料科学:综合
CiteScore
20.90
自引率
12.30%
发文量
318
审稿时长
53 days
期刊介绍: Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.
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