Pengaruh Abu Sekam Padi dan Kapur terhadap Kuat Tekan Bebas Tanah Lempung Ekspansif

USFAHIK, Antonius Adriano (2025) Pengaruh Abu Sekam Padi dan Kapur terhadap Kuat Tekan Bebas Tanah Lempung Ekspansif. Undergraduate thesis, Universitas Katolik Widya Mandira.

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Abstract

Infrastructure development in Indonesia, particularly on Timor Island, frequently faces challenges due to the prevalence of expansive clay soils, which cover approximately 35% of the land area. These soils exhibit poor geotechnical characteristics, specifically high shrink-swell potential and low compressive strength, posing significant risks of structural damage to buildings and road pavements. This study aims to analyze the increase in Unconfined Compressive Strength (UCS) through chemical stabilization using a combination of local pozzolanic materials: Rice Husk Ash (RHA) and Lime. Furthermore, the study seeks to determine the optimum mixing ratio of these materials to provide a more economical and environmentally friendly alternative for soil improvement. The research was conducted through laboratory experiments at the Civil Engineering Laboratory of Universitas Katolik Widya Mandira, Kupang. Primary data were obtained from undisturbed soil samples collected in Tuapukan Village, Kupang Regency, at a depth of 45–50 cm. The testing program involved five variations: original soil (T0), 6% pure lime (K6), and three combinations of RHA and lime (T1, T2, T3) with a 7-day curing period. Data processing followed the SNI 3638:2012 standard to determine the unconfined compressive strength (qu) through stress-strain curve analysis from axial loading tests. The results demonstrated that the addition of RHA and lime significantly enhanced the mechanical strength of the expansive clay compared to the untreated soil. The highest UCS value was achieved by the T3 variation (2% Lime + 4% RHA), reaching 1.67 kg/cm², which represents a 107.74% increase from the original soil strength of 0.81 kg/cm². This improvement confirms that RHA effectively serves as a silica source, reacting with calcium from the lime to form pozzolanic compounds that fill the soil pores. Based on these findings, the T3 variation is identified as the optimal composition for maximizing soil strength performance.

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