钢渣-土混拌基层材料试验研究及微观机理分析
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1.安徽工业大学建筑工程学院;2.安徽工业大学;3.安徽马钢嘉华新型建材有限公司

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TU521

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Experimental study and Micro-mechanism Analysis of Steel Slag-soil mixed Base material
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1.Institute of Civil Engineering, Anhui University of Technology;2.ANHUI MASTEEL K.WAH NEW BUILDING MATERIALS CO.,LTD.

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    摘要:

    针对钢渣用于基层材料易发生膨胀的问题,采用钢渣、高炉矿渣微粉、土混拌并结合土体固化技术,制备道路基层材料-钢渣混合土。对其16组不同配比土样开展了击实、膨胀率、无侧限抗压强度试验。研究表明:钢渣混合土最佳含水率受配比影响较小,均维持在12~14%;最大干密度随钢渣掺量的减少而降低,随高炉矿渣微粉掺量的增加而降低;高炉矿渣微粉的掺入可显著降低钢渣混合土膨胀率,提高其无侧限抗压强度;7d、14d、28d、90d无侧限抗压强度均随钢渣占比增加呈先增后减趋势,配比为50wt%钢渣:50wt%土时达到最大。微观结构分析表明:土颗粒表面电荷的改变使得钢渣混合土体结构在成型时更易受压密实,钢渣中游离氧化钙(f-CaO)在固化过程中的水化反应受到明显抑制,主要与矿渣中二氧化硅(SiO2)发生消解反应生成水化硅酸钙凝胶(C-S-H);与此同时,钢渣、土相互包裹的颗粒间堆叠效应及C-S-H凝胶填充混合料缝隙产生的自密实效应进一步提高了土体强度,从而制备出强度高、安定性好的钢渣混合土。

    Abstract:

    Given to the expand problem of road base materials based on steel slag, steel slag, blast furnace slag micro-powder and soil were mixed and combined with soil solidification technology to prepare a road base material – steel slag mixed soil. The compaction, expansion rate and unconfined compressive strength tests were carried out on 16 soil samples with different ratios. The results showed that the optimum moisture content of the steel slag mixed soil presented little effect by the ratio, which maintained at 12~14%.The maximal dry density decreases with the decrease in the loading of steel slag, and decreases with the increase in the loading of blast furnace slag micro-powder mixed. The incorporation of blast furnace slag micro-powder could significantly reduce the expansion rate of steel slag mixed soil and increase its unconfined compressive strength. The unconfined compressive strengths of steel slag mixed soil for 7d, 14d, 28d and 90d were firstly increased then decreased with steel slag loading,which reached the maximal value when the ratio was 50% steel slag with 50% soil. Microstructural analysis confirmed that the change of the surface electrode of soil particles enhance the compactness of steel slag mixed soil in molding process. The hydration reaction of f-CaO in the steel slag was inhibited during the solidification process, and which conduct digestion reaction with SiO2 in the mineral slag to form hydrated calcium silicate gel (C-S-H). At the same time, inter-particle stacking effect between steel slag and soil and self-compacting effect produced by C-S-H gel could enhance strength of steel slag mixed soil, and thus prepared steel slag mixed soil with high strength and stability.

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历史
  • 收稿日期:2019-10-20
  • 最后修改日期:2020-03-24
  • 录用日期:2020-04-07
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