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Effect of Lime Addition on Compaction and ‎CBR Characteristics of Tropical Soft Clay

Author(s) Irma Aswani Ahmad, Nur Anny Suryaningsih Taufieq, Hasmita Sari
Country Indonesia
Abstract Soft clay soils present significant challenges in civil engineering due to their low bearing capacity, high ‎compressibility, and susceptibility to moisture-induced volume changes. These characteristics make such ‎soils unsuitable for direct use in foundation and pavement layers without stabilization. Although lime ‎stabilization is a well-established method for improving soil strength and plasticity, its application to ‎tropical clays, particularly in Indonesia, remains underexplored. This study investigates the effect of lime ‎addition at varying percentages (15%, 20%, and 25% by dry weight) on the physical and mechanical ‎properties of soft clay soil. Laboratory experiments were conducted without curing, using samples ‎collected from Moncongloe, South Sulawesi, Indonesia. The soil was classified as A-7-6 under the ‎AASHTO system and CL/OL under the USCS system, indicating high plasticity and low bearing ‎capacity. Key tests included moisture content, Atterberg limits, compaction, and California Bearing ‎Ratio (CBR). Results showed that increasing the lime content raised the optimum moisture content ‎‎(OMC) from 21.89% to 26.39%. The maximum dry density peaked at 1.54 g/cm³ with 20% lime and ‎decreased beyond that. CBR values also improved significantly with 20% lime (52.75%) but declined at ‎‎25% (46.57%), suggesting an optimum reaction threshold. The findings demonstrate that a 20% lime ‎content yields the best improvement in both compaction and strength parameters under no-curing ‎conditions. This study provides practical insights into the stabilization of tropical clays and supports the ‎selection of effective lime treatment strategies in similar geotechnical environments.‎
Keywords Soft clay, Lime stabilization, Soil compaction, CBR test, Tropical soil
Field Engineering
Published In Volume 16, Issue 2, April-June 2025
Published On 2025-06-03
DOI https://doi.org/10.71097/IJSAT.v16.i2.5940
Short DOI https://doi.org/g9m28q
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