粉煤灰在不饱和碱性溶液中的溶解

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-06-18 DOI:10.1016/j.cemconres.2025.107967

Yujia Min, Lisa E. Burris

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引用次数: 0

摘要

本文研究了8种C类和8种F类粉煤灰在pH 12.4 ~ 13.8、25 ~ 60℃欠饱和条件下的溶解。C类粉煤灰对Al的溶解优于Si，低钙粉煤灰对Al的溶解优于Si。溶液中Si对C类灰的溶解有抑制作用，Ca和Al对F类灰的溶解有抑制作用。在相同浓度下，NaOH溶解F类粉煤灰的速度比KOH快。每个四面体的非桥氧与早期溶解速率有关，而长期反应性与活性Al和Si含量有关。在25℃时，稀溶液中的溶解度与R3混合物中的反应程度一致，但在40和60℃时，溶解度更大。这些结果有助于我们了解粉煤灰的溶解，并预测在与评价胶凝混合物性能相关的条件下的反应性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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The dissolution of fly ashes in undersaturated alkaline solutions

This study investigated the dissolution of 8 class C and 8 class F fly ashes in undersaturated conditions at pH 12.4–13.8 and 25–60 °C. Class C fly ashes showed preferential dissolution of Al over Si, while congruent dissolution was observed for low Ca fly ashes. Si in solution inhibited the dissolution of class C ashes, while Ca and Al inhibited the dissolution of class F ashes. NaOH dissolved class F fly ashes faster than KOH at the same concentrations. Non-bridging oxygen per tetrahedra correlated with dissolution rates in early hours while long-term reactivity was related to reactive Al and Si content. Dissolution in the dilute solution was consistent with reaction extent in R³ mixtures at 25 °C, and but greater for reactions at 40 and 60 °C. These results help us understand fly ash dissolution and predict reactivity under conditions relevant to those used to evaluate performance in cementitious mixtures.

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来源期刊

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.