Assessment of alkali-induced heave in soil and its stabilisation using slag

IF 1.3 Q3 ENGINEERING, GEOLOGICAL

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-09-01 DOI:10.1680/jgrim.21.00019

Manish Kumar Mandal, Bala Ramudu Paramkusam

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引用次数: 1

Abstract

Soil–alkali-interaction results in unexpected heaving and other negative effects of soil properties, which can lead to complete failure of structures. An investigation was carried out on the impact of highly concentrated sodium hydroxide alkali on the heaving behaviour of low-plasticity clay. The effect of ground-granulated blast-furnace slag as a stabiliser for alkali-interacted soil was also investigated. The interaction of alkali with the soil showed heaving up to 5.25% after 30 days, while a slag content of 20% showed maximum suppression of heave. The alkali-interacted soil stabilised with slag was also compared with un-interacted soil mixed with slag. There was a marginal increase in friction angle with an increase in curing period, and a significant increase in cohesion for both. A substantial improvement in unconfined compressive strength was also evident with increased slag content and curing period. The results were supported by microstructural examinations. The application of slag as a liquid-based stabiliser for alkali-interacted soil was also conducted using electrokinetics. Statistical analysis indicated that the curing period was a dominant parameter in affecting the compressive strength of un-interacted soil while, for alkali-interacted soil, slag content was more dominant.

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土中碱致隆起评价及矿渣稳定

土-碱相互作用会导致土体发生意想不到的起伏和其他负面影响，从而导致结构的完全破坏。研究了高浓度氢氧化钠碱对低塑性粘土起伏特性的影响。研究了高炉磨粒渣作为碱作用土的稳定剂的效果。碱与土壤的相互作用使30 d后的沉陷率达到5.25%，而矿渣含量为20%时对沉陷的抑制作用最大。并对碱相互作用后的矿渣稳定土与碱相互作用后的矿渣稳定土进行了比较。随着养护时间的延长，摩擦角略有增加，黏聚力均有显著增加。随着渣量的增加和养护时间的延长，无侧限抗压强度也有了明显的提高。结果得到了显微组织检查的支持。利用电动力学方法对矿渣作为液基稳定剂在碱作用土壤中的应用进行了研究。统计分析表明，养护时间是影响未相互作用土抗压强度的主要参数，而对于碱相互作用土，矿渣含量的影响更大。

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来源期刊

Proceedings of the Institution of Civil Engineers-Ground Improvement ENGINEERING, GEOLOGICAL-

CiteScore

3.10

自引率

8.30%

发文量

期刊介绍： Ground Improvement provides a fast-track vehicle for the dissemination of news in technological developments, feasibility studies and innovative engineering applications for all aspects of ground improvement, ground reinforcement and grouting. The journal publishes high-quality, practical papers relevant to engineers, specialist contractors and academics involved in the development, design, construction, monitoring and quality control aspects of ground improvement. It covers a wide range of civil and environmental engineering applications, including analytical advances, performance evaluations, pilot and model studies, instrumented case-histories and innovative applications of existing technology.