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砂类型和碱当量对海水海砂碱激发矿渣混凝土干燥收缩及微观结构的影响

Effects of Sand Type and Alkali Equivalent on Drying Shrinkage and Microstructure of Seawater-Sea Sand Alkali-Activated Slag Concrete.

作者信息

Zhang Jianbin, Kang Sixiang, Shen Yanran, Song Chenhao, Lei Haoliang, Xie Wei, Chen Xianyun, Wang Jize, Wu Wenda, Wang Xuefang

机构信息

Xiamen Municipal Engineering Design Institute Co., Ltd., Xiamen 361000, China.

College of Advanced Manufacturing, Fuzhou University, Quanzhou 362200, China.

出版信息

Materials (Basel). 2025 Feb 25;18(5):1005. doi: 10.3390/ma18051005.

DOI:10.3390/ma18051005
PMID:40077231
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11901129/
Abstract

The use of seawater and sea sand for the preparation of alkali-activated concretes plays an important role in reducing carbon emissions and alleviating resource scarcity. However, both alkali-activated concretes and products made from seawater and sea sand tend to exhibit significant drying shrinkage. Therefore, this study investigates the effect of the addition of seawater and sea sand on the basic properties and drying shrinkage properties of alkali-activated concretes, and regulates the properties of seawater and sea sand alkali-activated slag (SSAS) concretes with the key parameter of the alkali equivalent. Finally, the mechanism of SSAS drying shrinkage improvement was investigated using XRD, TG, MIP, and SEM. The results show that the addition of seawater and untreated sea sand accelerates the hydration reaction of alkali-excited cement and can significantly reduce its drying shrinkage. A moderate increase in alkali content can improve the compressive strength and reduce the drying shrinkage. However, an excessively high alkali content reduces the flexural strength. Finally, we propose the existence of a quantitative relationship between drying shrinkage, mass loss, and the evaporable water content, which better explains the mechanism of shrinkage variation. These effects are mainly attributed to changes in microstructure and phase composition. This study provides theoretical support for engineering applications of seawater-sea sand alkali-activated materials.

摘要

使用海水和海砂制备碱激发混凝土在减少碳排放和缓解资源短缺方面发挥着重要作用。然而，碱激发混凝土以及由海水和海砂制成的产品往往表现出显著的干燥收缩。因此，本研究探讨了添加海水和海砂对碱激发混凝土基本性能和干燥收缩性能的影响，并以碱当量这一关键参数来调控海水海砂碱激发矿渣（SSAS）混凝土的性能。最后，利用X射线衍射（XRD）、热重分析（TG）、压汞法（MIP）和扫描电子显微镜（SEM）研究了SSAS干燥收缩改善的机理。结果表明，添加海水和未经处理的海砂会加速碱激发水泥的水化反应，并能显著降低其干燥收缩。适度增加碱含量可提高抗压强度并降低干燥收缩。然而，碱含量过高会降低抗折强度。最后，我们提出干燥收缩、质量损失和可蒸发水含量之间存在定量关系，这更好地解释了收缩变化的机理。这些影响主要归因于微观结构和相组成的变化。本研究为海水海砂碱激发材料的工程应用提供了理论支持。

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