HERMAWAN, NIM.112021058 (2026) PENGARUH PENGGUNAAN ABU JERAMI PADI DAN GYPSUM SEBAGAI BAHAN STABILISASI PADA TANAH LEMPUNG. Skripsi thesis, Universitas Muhammadiyah Palembang.

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Abstract

Clay soil has low bearing capacity, is easily deformed (plastic), and tends to swell when wet and shrink when dry. Therefore, this type of soil needs to be stabilized. This study aims to determine the effect of adding rice husk ash and gypsum on improving the properties of clay soil, both its physical and mechanical characteristics, with the unconfined compressive strength value used as the main parameter. The mixtures used consisted of rice husk ash at 7%, 9%, 11%, and 13%, while the gypsum content was kept constant at 5% of the dry soil weight. In addition, the effect of curing periods of 0, 7, and 14 days was also evaluated to determine the extent of changes that occurred over time. The test results showed that the addition of rice husk ash and gypsum had a significant effect on reducing moisture content, increasing specific gravity, changing the Atterberg limits, The results also indicated that the soil bearing capacity value (qu) and the cohesion value or bonding force between soil particles (cu) tended to increase from 0 days of curing to 7 days, and reached the highest value at 14 days of curing. This shows that curing time has a strong influence, because the longer the curing period, the more complete the reaction between the soil, rice husk ash, and gypsum, resulting in stronger soil. The highest maximum dry unit weight was obtained in the mixture containing 9% rice husk ash + 5% gypsum, with the lowest optimum moisture content. In the unconfined compressive strength test, the soil bearing capacity value (qu) increased from 2.41839 kg/cm² in the natural soil to a maximum of 3.45257 kg/cm² in the mixture with 9% rice husk ash + 5% gypsum after 14 days of curing. The bonding force between soil particles (cu) also increased to 1.72629 kg/cm² in the same variation. The addition of rice husk ash above 11% and 13% caused a decrease in the soil bearing capacity value (qu) and the bonding force between soil particles (cu) because the soil structure became less dense.

Item Type:	Thesis (Skripsi)
Additional Information:	Pembimbing:1. Mira Setiawati, S.T.,M.T. 2. Muhammad Arfan,S.T.,M.T.
Uncontrolled Keywords:	Clay soil, rice straw ash, gypsum, soil stabilization, unconfined compressive strength, optimum moisture content.
Subjects:	Teknik Sipil > geologi teknis (untuk teknik sipil)
Divisions:	Fakultas Teknik > Teknik Sipil (S1)
Depositing User:	Mahasiswa Fakultas Teknik
Date Deposited:	06 May 2026 07:09
Last Modified:	06 May 2026 07:09
URI:	http://repository.um-palembang.ac.id/id/eprint/35744

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