Optimization of hydration kinetics, phase development and mechanical properties of CAC in mix with calcite by addition of sodium hydroxide and citric acid

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

Cement and Concrete Research Pub Date : 2025-09-20 DOI:10.1016/j.cemconres.2025.108045

Pauline Rost , Christiane Rößler , Jürgen Neubauer , Friedlinde Goetz-Neunhoeffer

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Abstract

The influence of sodium hydroxide and citric acid on the hydration of a calcium aluminate cement – calcite mixture was investigated. Both the effect of the two additives individually and in combination were analysed. Sodium hydroxide accelerates the reaction, leads to dominant monocarbonate formation and higher inner strength. However, the workability is reduced. Citric acid retards the reaction, lowers the inner strength but has a positive influence on the workability. Furthermore, the main reaction with citric acid only begins when the concentration of citric acid in the pore solution drops below 125–115 mmol/l. In combination of both additives, NaOH improves the inner strength, whereas higher doses of citric acid improve the workability, whereby the dominant hydrate phase composition changes from monocarbonate to CAH₁₀. In addition, it was observed that a higher degree of hydration within the first 24 h is associated with increased inner strength after 28 d.

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氢氧化钠和柠檬酸对碳酸钙与方解石混合的水化动力学、相发育及力学性能的优化

研究了氢氧化钠和柠檬酸对铝酸钙水泥-方解石混合物水化性能的影响。分析了两种添加剂单独使用和联合使用的效果。氢氧化钠加速反应，形成优势的单碳酸盐和更高的内部强度。然而，可加工性降低。柠檬酸延缓了反应，降低了内部强度，但对和易性有积极的影响。只有当孔溶液中柠檬酸浓度降到125 ~ 115 mmol/l以下时，才会发生与柠檬酸的主反应。两种添加剂联合使用时，NaOH提高了内部强度，而高剂量的柠檬酸提高了和易性，主要水合物组成由单碳酸盐变为CAH10。此外，还观察到，前24 h较高的水化程度与28 d后的内部强度增加有关。

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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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.