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
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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.
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。
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来源期刊
Journal of CO2 Utilization
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.
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