Analysis of Soil-Cement Mixture for Ground Improvement-Paper

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The study evaluates cement stabilization as a ground-improvement method for two low-density river sands: Tapi River soil and Dahisar River soil. Samples were mixed with ordinary Portland cement at dosages of 275, 325, 375, and 425 kg/m³, using water–cement ratios of 0.2, 0.3, and 0.4. Unconfined compressive strength was measured after 7 and 28 days of curing.<br /><br />Strength increased with both cement dosage and water–cement ratio. The highest measured strengths occurred at a water–cement ratio of 0.4 and cement dosage of 425 kg/m³. After 28 days, these were 22.92 N/mm² for Tapi River soil and 21.33 N/mm² for Dahisar River soil. Tapi River specimens generally achieved higher strengths, although the difference between soils narrowed at the higher water–cement ratio. Twenty-eight-day strengths were approximately 25–33% greater than 7-day strengths.<br /><br />At water–cement ratios of 0.2 and 0.3, specimens with the lower cement dosages could not be removed from their moulds, indicating workability limitations. Overall, the findings show that cement content, water–cement ratio, soil type, and curing time affect the strength of soil–cement mixtures. The authors recommend further study of the mixtures’ secant modulus for practical design.

Keywords

cement stabilization

ground improvement

river sand

Tapi River soil

Dahisar River soil

ordinary Portland cement

water-cement ratio

unconfined compressive strength

curing time

soil-cement mixtures