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Expansive soil modified by waste steel slag and its application in subbase layer of highways

机译：废钢渣改性膨胀土及其在公路基层中的应用

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摘要

Steel slag is a waste by-product of the steel industry. The recycling usage of steel slag is limited due to the mutative chemical compositions it contains and its low cementation. In this investigation, the composition adjustment and activation of steel slag were studied to produce an optimal slag-based composite with improved cementation efficiency. The controlling moduli of cement clinker were introduced to standardise the composite. Subsequently, the composite was used to modify Hefei expansive soil (a kind of engineering waste for swelling properties) in embankment construction. The basic physical properties including free swelling ratio, California bearing ratio, unconfined compressive strength, microstructure, and mineral evolution were evaluated to understand the engineering performance and mechanism of modified expansive soils. The results show that the cementation of the slag was significantly improved after the composition adjustment and activation. Furthermore, the treated soil can satisfy the requirement of the Chinese standard for first-class road/highway when the composite incorporation ratio is more than 5%. The microstructural and mineralogical analysis shows that the component adjustment and activation enrich the cementation of the slag, resulting in the suppression of the swelling potential and improved strength. The above findings improve the reuse efficiency of steel slag, especially in expansive soil modifications. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：钢渣是钢铁行业的废物副产品。钢渣的循环利用受到限制，这归因于钢渣包含的突变化学成分及其低胶结作用。在这项研究中，研究了钢渣的成分调节和活化作用，以生产出具有最佳固结效率的最佳渣基复合材料。引入水泥熟料的控制模量以标准化复合材料。随后，该复合材料用于路堤施工中的合肥膨胀土（一种具有膨胀特性的工程废料）的改性。评估了基本物理特性，包括自由溶胀率，加利福尼亚承载比，无侧限抗压强度，微观结构和矿物演化，以了解改性膨胀土的工程性能和机理。结果表明，调整组成和活化后，渣的胶结作用得到了明显改善。此外，当复合掺入率大于5％时，处理后的土壤可以满足中国一级公路/高速公路标准的要求。显微组织和矿物学分析表明，组分的调节和活化作用丰富了炉渣的胶结作用，从而抑制了溶胀潜力并提高了强度。上述发现提高了钢渣的再利用效率，特别是在膨胀土壤改良中。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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