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Influence of seawater on alkali-activated slag concrete

机译：海水对碱活性炉渣混凝土的影响

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摘要

This study examines the use of natural seawater as mixing water for alkali-activated slag concrete and reports the characteristics of alkali-activated slag concrete with exposure to seawater. Preliminary experiments were conducted on pastes in order to measure pH and select optimum activator content under the experimental conditions. Wet-sieved pastes from fresh concrete were used to evaluate the mineralogical and microstructural characteristics of reaction products. Compressive strengths and chloride contents were measured with the hardened concrete samples. The activators used in alkali-activated slag concrete were sodium hydroxide (5% weight of slag) and liquid sodium silicate (5% weight of slag). The alkali-activated slag samples showed the carbonation of calcium silicate hydrate (C–S–H), which resulted in the reduction in strength with time. The seawater-mixed alkali-activated slag samples produced additional reaction products, C4AH13, and chloride-bearing hydrocalumite, and they improved the strength. The seawater-mixed alkali-activated slag samples exposed in seawater exhibited improved mechanical performance compared to other samples. C–S–H carbonation did not occur, refinement of the pore structure was confirmed, and the compressive strength increased after exposure to seawater. The release of partial chloride ions, which were bound in solid phases, occurred; however, such slight leaching did not affect the strength of the samples. The investigation within the experimental conditions of this study showed a positive result regarding the use of seawater as mixing water in alkali-activated slag concrete.
机译：本研究探讨了天然海水作为碱活性渣混凝土的混合水，并报告了海水暴露的碱活化矿渣混凝土的特点。在浆料上进行初步实验，以测量pH值并在实验条件下选择最佳活化剂含量。来自新鲜混凝土的湿式糊状物用于评估反应产物的矿物学和微观结构特征。用硬化的混凝土样品测量抗压强度和氯化物含量。碱活化炉渣混凝土中使用的活化剂是氢氧化钠（5％重量的炉渣）和硅酸盐（5％重量的炉渣）。碱活化的渣样品显示硅酸钙水合物（C-S-H）的碳酸化，这导致随时间的强度降低。海水混合碱活化炉渣样品生产了另外的反应产物，C4aH13和含氯含氢氢化物，它们改善了强度。与其他样品相比，海水暴露的海水混合碱活化矿渣样品表现出改善的机械性能。没有发生C-S-H碳酸化，确认孔隙结构的细化，暴露于海水后抗压强度增加。发生在固相中束缚的部分氯离子的释放;然而，这种轻微的浸出不会影响样品的强度。该研究实验条件下的研究表明，在碱活化渣混凝土中使用海水作为混合水的阳性结果。

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  • 来源
    《Materials and structures》 |2021年第3期|121.1-121.16|共16页
  • 作者

    Yubin Jun; Jae Hong Kim; Seong Ho Han; Taewan Kim;

  • 作者单位

    Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea;

    Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea;

    Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea;

    Department of Civil Engineering Pusan National University Busan 46241 Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Alternative cement; Seawater; Alkali activator; Mixing water; Exposure;

    机译：替代水泥;海水;碱活化剂;混合水;曝光;

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