Dissolution and early hydration of tetracalcium aluminoferrite (C4AF) in water and in aqueous sulfate solutions

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2024-09-09 DOI:10.1016/j.cemconres.2024.107676

Shaoxiong Ye , Pan Feng , Jiaping Liu

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引用次数: 0

Abstract

Fe-rich cementitious phases, such as tetracalcium aluminate (C₄AF), are likely the least characterized and understood components of ordinary cements, in terms of their reactivity and early-age reactions. In this study, we provided the first in-situ measurements of C₄AF's absolute dissolution rates in water and aqueous sulfate solutions (Na₂SO₄, MgSO₄ and CaSO₄) along with its early-age hydration characterization. Upon contact with water, C₄AF dissolved at a rate of 1.74 ± 0.23 μmol·m⁻²·s⁻¹, and sulfates were found to inhibit its reaction. Among the three types of sulfates tested, CaSO₄ exhibited the strongest inhibition effect, while Na₂SO₄ showed the weakest inhibition. Soon after the initial dissolution, the precipitation of hydrates occurred, and the presence of sulfates affected the overall hydration process of C₄AF. These results enhance our understanding of C₄AF's dissolution and early-age hydration behaviours, thereby advancing our knowledge of its hydration mechanisms.

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氧化铝铁酸四钙（C4AF）在水和硫酸盐水溶液中的溶解和早期水合作用

铝酸钙四钙（C4AF）等富含铁的胶凝相态可能是普通水泥中特征最不明显、最不为人所知的成分，这与它们的反应性和早期龄期反应有关。在本研究中，我们首次对 C4AF 在水和硫酸盐水溶液（Na2SO4、MgSO4 和 CaSO4）中的绝对溶解速率及其早期水化特性进行了现场测量。与水接触时，C4AF 的溶解速率为 1.74 ± 0.23 μmol-m-2-s-1，硫酸盐会抑制其反应。在测试的三种硫酸盐中，CaSO4 的抑制作用最强，而 Na2SO4 的抑制作用最弱。在初始溶解后不久，就出现了水合物的沉淀，硫酸盐的存在影响了 C4AF 的整体水合过程。这些结果加深了我们对 C4AF 的溶解和早期水合行为的理解，从而推进了我们对其水合机制的认识。

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.