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Journal of Geotechnical Engineering Original Research

Evaluate The Engineering Properties of Low Load-Carrying Capacity of Expansive Soil by Using Magnesium Chloride and Dry Leaf Ash Powder

  1. V. Jaladevi
  2. V. Murugaiyan

Abstract

The swell-shrink behavior of expansive soils poses numerous challenges with the substructure and distress in infrastructures such as buildings, pavements, breast walls, etc. The behavior of expanding soil has been carefully examined by geotechnical engineers, who have then put adequate management techniques into place. Present investigation intends to investigate potential benefits of dry leaf ash (DLA) powder and magnesium chloride (MgCl2) to enhance geological characteristics of soil, particularly addressing problems of limited load-bearing capacity, significant swelling, and substantial shrinking, all of which are advantageous to civil engineering. The effects of dry leaf ash (2.5, 5.0, 7.5, and 10%) and MgCl2 (0.25, 0.5, 0.75, and 1%) on the Atterberg limits, MDD (maximum dry density), UCS (unconfined compressive strength), XRD, OMC (optimal moisture content), SEM, as well as other crucial soil properties have been computed using an experimental program. The two admixtures were mixed into expanding soil after being introduced separately. The incorporation of specific admixtures significantly reduced plasticity index, liquid limit, optimal moisture content, as well as swelling parameters of expansive soil. After 56 days, UCS gradually increased from 47.57kPa - 1386kPa, mostly as a result of the synergistic interaction between 7.5% dry leaf ash and 0.75% magnesium chloride with the soil. This interaction was noticeably more successful than that of other admixture combinations. Establishment of C-A-H (Calcium Aluminate Hydrates) along with M-S-H (Magnesium Silicate Hydrate), as well as other cementitious compounds found in SEM and XRD investigations, contribute to the strength improvement. Accordingly, the results showed that adding 0.75% MgCl2 and 7.5% DLA greatly improved high swell-shrink soil with insufficient bearing capacity, proving that the admixture is a practical stabilizer and that it also lowers construction costs by optimizing natural ash powder.

Keywords

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