Transformations in the reaction products and properties of carbonation-cured CSA cements exposed to a sulfate attack

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization Pub Date : 2024-10-28 DOI:10.1016/j.jcou.2024.102964

Joonho Seo , Daeik Jang , Jin-Ho Bae , Naru Kim , Jihoon Park , Alam Cho , H.K. Lee

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Abstract

Reaction products and properties of carbonation-cured calcium sulfoaluminate (CSA) cements exposed to a sulfate attack were explored in an attempt to elucidate their durability aspects and potential opportunities for practical applications. CSA paste samples were either normally cured or carbonation-cured and subsequently immersed in a Na₂SO₄ solution. The test results indicated that carbonation curing hindered the delayed ettringite formation induced by a sulfate attack, especially in the carbonation-cured samples with an m-value of 0.5 or 1.0. In addition, these carbonation-cured samples exhibited less degrees of weight and mass loss compared to the normally cured samples. Given these test results, the carbonation-cured samples with an m-value of 0.5 – 1.0 were found to be the most durable against the Na₂SO₄ attack. The outcomes of this study can be viewed important as they provide a fundamental data source for developing guidelines on producing highly durable materials by combining mixture proportioning and carbonation curing when CSA cements are applied in areas particularly susceptible to sulfate attacks.

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受硫酸盐侵蚀的碳化固化 CSA 水泥的反应产物和性能变化

研究人员探讨了硫酸盐侵蚀下碳化硫铝酸钙（CSA）水泥的反应产物和特性，试图阐明其耐久性方面的问题以及实际应用的潜在机会。CSA 浆料样品经过正常固化或碳化固化，然后浸入 Na2SO4 溶液中。测试结果表明，碳化固化阻碍了硫酸盐侵蚀引起的蚀变体延迟形成，尤其是在 m 值为 0.5 或 1.0 的碳化固化样品中。此外，与正常固化的样品相比，这些碳化固化样品的重量和质量损失程度较小。鉴于这些测试结果，我们发现 m 值为 0.5 - 1.0 的碳化固化样品最能抵御 Na2SO4 的侵蚀。这项研究的结果非常重要，因为它为制定指导方针提供了基础数据源，以便在特别容易受到硫酸盐侵蚀的地区应用 CSA 水泥时，通过将混合物配比和碳化固化相结合来生产高耐久性材料。

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

Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

13.90

自引率

10.40%

发文量

406

审稿时长

2.8 months

期刊介绍： The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.