Pengaruh Variasi Abu Sekam Padi dan Kapur Terhadap Karakteristik Pemadatan (Proctor Standar) Tanah Lempung Ekspansif

SAKA, Gregorius Dimas (2025) Pengaruh Variasi Abu Sekam Padi dan Kapur Terhadap Karakteristik Pemadatan (Proctor Standar) Tanah Lempung Ekspansif. Undergraduate thesis, Universitas Katolik Widya Mandira.

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Abstract

Expansive clay soil is characterized by high plasticity, low bearing capacity, and significant swelling-shrinkage behavior caused by moisture variations, which often leads to construction problems. This study aims to evaluate the effect of rice husk ash (RHA) and lime variations on the compaction characteristics of expansive clay soil based on the Standard Proctor test, and to determine the most effective substitution ratio at a total stabilizer content of 6%. Soil samples were collected from Tuapukan Village, East Kupang District, Kupang Regency. The mixture variations consisted of T0 (without stabilizer), K6 (6% lime), T1 (4% lime + 2% RHA), T2 (3% lime + 3% RHA), and T3 (2% lime + 4% RHA). Tests included physical properties and compaction characteristics, namely optimum moisture content (OMC) and maximum dry density (MDD). The results indicate that the addition of rice husk ash and lime improves the compaction characteristics of expansive clay soil through pozzolanic reactions that enhance soil structure and stability. Certain mixture variations produced higher MDD values and more optimal OMC compared to untreated soil. This study is expected to serve as a technical reference for environmentally friendly and economical soil stabilization using agricultural waste materials.

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