Pengaruh Kombinasi Abu Sekam Padi dan Kapur terhadap Perubahan Sifat Indeks (Batas Atterberg) Tanah Lempung Ekspansif

FUAMUNI, Arsenius Agung Lopo (2025) Pengaruh Kombinasi Abu Sekam Padi dan Kapur terhadap Perubahan Sifat Indeks (Batas Atterberg) Tanah Lempung Ekspansif. Undergraduate thesis, Universitas Katolik Widya Mandira.

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Abstract

This study is entitled “The Effect of Rice Husk Ash and Lime Combination on the Changes in Index Properties (Atterberg Limits) of Expansive Clay Soil.” The main issue addressed is infrastructure instability in Tuapukan Village, Kupang Regency, caused by the characteristics of expansive clay soil with high shrink–swell potential. The objective of this research is to analyze the effect of variations in the combination of Rice Husk Ash (RHA) and lime on the values of Liquid Limit (LL), Plastic Limit (PL), Plasticity Index (PI), and Shrinkage Limit (SL) in order to determine the optimum content for stabilizing the soil. The method used was laboratory testing on soil samples taken from Tuapukan Village at a depth of 45 cm. The stabilizing materials consisted of a combination of lime and RHA with the following mixture variations: T0 (0%), K6 (6% lime), T1 (4% lime : 2% RHA), T2 (3% lime : 3% RHA), T3 (2% lime : 4% RHA), and ASP6 (6% RHA). All mixed samples were subjected to a curing period of 7 days before conducting the Atterberg Limits tests. The results showed that the original soil (T0) was classified as high-plasticity clay (CH / A-7-6) with an LL value of 60.59% and a PI of 39.08%. After stabilization and 7 days of curing, the K6, T1, T2, and T3 mixtures successfully transformed the soil behavior into Non-Plastic (NP), classified as Elastic Silt (MH / A-5). The greatest reduction in LL among the limecontaining variations was found in the T2 mixture (3% lime : 3% RHA), reaching 57.86%. In contrast, the use of pure RHA without lime (ASP6) increased the LL value to 66.98%. These results demonstrate that the synergy between lime as an activator and RHA as a pozzolanic material is highly effective in eliminating the plasticity characteristics of expansive clay soil, thereby improving subgrade stability.

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