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传统使用石灰水泥对含硫酸盐土壤进行加固时会产生很大程度的体积膨胀。经过研究发现使用粒化高炉矿渣微粉(GGBS)可以消除这种体积膨胀。高炉矿渣是炼钢产业的一种副产品,经过粉磨后将有潜在的可水化性,这种潜在的可水化性可通过添加石灰、PC等碱性化合物进行激发从而发生水化反应。本文结合众多学者的已有研究成果,从液塑限、压实特性、抗压强度、膨胀性等方面对GGBS对固化土工程特性的影响进行了归纳与总结。结果表明GGBS的加入使得石灰固化土的液塑限发生了改变,塑性指数有所升高,同时最大干密度增大、最优含水率降低,并显著提高了被固化土的抗压强度;且在石灰固化含硫酸盐土壤中加入GGBS可以大大减小固化土的体积膨胀性。
Traditionally, the use of lime cement to reinforce sulphate-containing soils results in a significant volume expansion. After the study found that the use of granulated blast furnace slag (GGBS) can eliminate this volume expansion. Blast furnace slag is a by-product of the steelmaking industry and will have potential hydration after grinding. This potential hydration may be hydrated by the addition of basic compounds such as lime and PC. Based on the existing research results of many scholars, this paper summarizes the influence of GGBS on the engineering properties of solidified soil from aspects of liquid-plastic limit, compaction, compressive strength and expansibility. The results show that with the addition of GGBS, the liquid-plastic limit of lime-cured soil changes, the plasticity index increases, the maximum dry density increases, the optimum moisture content decreases, and the compressive strength of cured soil increases significantly. The addition of GGBS to lime-cured sulphate-containing soils can greatly reduce the volume swell of solidified soils.