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<p>The precipitation of Calcium Carbonate (<i>CaCO</i><sub><i>3</i></sub>) within granular soil, results in enhancement of the strength and stiffness properties of soil. The efficiency of Enzyme-Induced Calcite Precipitation (EICP) on soil is dependent on several factors related to cementing media strength, pH, enzyme concentration, treatment cycles, etc. However, the effect of presence of organic or Mg-based substrates has not been extensively examined in the presence of fines. This study investigates the influence of the addition of a non-fat milk powder (an organic substrate) and Mg-based substrate [i.e., Magnesium Chloride (<i>MgCl</i><sub><i>2</i></sub>) and Magnesium Sulfate (<i>MgSO</i><sub><i>4</i></sub>)] substituted in the cementing solution of Urea, Calcium Chloride, and a Urease Enzyme, on <i>CaCO</i><sub><i>3</i></sub> precipitation. The effect of cementing solution and treatment cycle was studied on the two types of local soil collected from Meghalaya (viz. W<sub>1</sub> and W<sub>2</sub>) having 9.58% fines and 15.69% fines respectively<i>.</i> The change in Unconfined Compressive Strength (UCS) of local soils with the Organic and Mg-based substrate directly correlated with the precipitated mass of <i>CaCO</i><sub><i>3</i></sub> in soils. The soil W<sub>1</sub> with a lesser percentage of fines demonstrated a higher increase in UCS by 211.01%, compared to only 52.05% in the case of W<sub>2</sub> on addition of just milk powder. However, with the addition of EICP + Milk + <i>MgCl</i><sub><i>2</i></sub>, the UCS improved significantly to 839.47% and 255.72% respectively. Mineralogical analysis revealed that the inclusion of Mg-based substrate in the grouting solution exhibited the potential for promoting aragonite and dolomite formation, in addition to calcite. The measured properties of the treated samples were compared in light of the&#xa0;mineralogical composition and grain size distribution&#xa0;of the soils.</p>

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Carbonate Precipitation in Soils, Triggered by Organic and Mg-Based Substrate in EICP Process

  • 期刊论文

  • 发表日期：

    2025年1月28日

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  • Pranamee Baruah,
  • Susmita Sharma

摘要

The precipitation of Calcium Carbonate (CaCO3) within granular soil, results in enhancement of the strength and stiffness properties of soil. The efficiency of Enzyme-Induced Calcite Precipitation (EICP) on soil is dependent on several factors related to cementing media strength, pH, enzyme concentration, treatment cycles, etc. However, the effect of presence of organic or Mg-based substrates has not been extensively examined in the presence of fines. This study investigates the influence of the addition of a non-fat milk powder (an organic substrate) and Mg-based substrate [i.e., Magnesium Chloride (MgCl2) and Magnesium Sulfate (MgSO4)] substituted in the cementing solution of Urea, Calcium Chloride, and a Urease Enzyme, on CaCO3 precipitation. The effect of cementing solution and treatment cycle was studied on the two types of local soil collected from Meghalaya (viz. W1 and W2) having 9.58% fines and 15.69% fines respectively. The change in Unconfined Compressive Strength (UCS) of local soils with the Organic and Mg-based substrate directly correlated with the precipitated mass of CaCO3 in soils. The soil W1 with a lesser percentage of fines demonstrated a higher increase in UCS by 211.01%, compared to only 52.05% in the case of W2 on addition of just milk powder. However, with the addition of EICP + Milk + MgCl2, the UCS improved significantly to 839.47% and 255.72% respectively. Mineralogical analysis revealed that the inclusion of Mg-based substrate in the grouting solution exhibited the potential for promoting aragonite and dolomite formation, in addition to calcite. The measured properties of the treated samples were compared in light of the mineralogical composition and grain size distribution of the soils.