粒化高炉矿渣微粉对固化土特性影响研究

The Effects of GGBS on the Engineering Properties of Stabilized Soil

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。

The traditional soil stabilization using lime and PC could cause excessive swelling in sulfate-bearing clay soils. Research work has shown that the use of ground granulated blastfurnace slag(GGBS) can eliminate such expansive tendencies. Blastfurnace slag is produced from iron blast furnaces as a byproduct of the iron-making industry. It has the potential to be hydrated that can be activated using a variety of compounds such as lime,alkalis and PC. In this paper many researches about GGBS have been reviewed and the effects of GGBS on the engineering properties of stabilized soil have been summarized from following four aspects: consistency limits,compaction characteristics,compressive strength and swelling potential. The result shows that the liquid-plastic limits of the lime stabilized soil changed and the plasticity increased with the addition of GGBS; meanwhile,the maximun dry density increased and the optimum water content decreased. Also,the compressive strength of the stabilized soil increased significantly. And the addition of GGBS into the lime stabilized sulfate bearing soil can greatly reduce the swelling potential.