ADHILA WARSYAH, NIM. 112021118 (2025) PENGARUH SUBSTITUSI ABU SERABUT KELAPA DAN SEMEN PORTLAND TERHADAP STABILITAS TANAH LANAU. Skripsi thesis, Universitas Muhammadiyah Palembang.

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Abstract

PENGARUH SUBTITUSI ABU SERABUT KELAPA DAN SEMEN PORTLAND TERHADAP STABILITAS TANAH LANAU ABSTRACT Adhila Warsyah1, Nurnilam Oemiati2, Revisdah3 Silt soil is known for its fine particle size, rapid water absorption, and low interparticle binding capacity. These characteristics make silt soil less stable and require improvement for use as a base material for construction, especially for infrastructure such as roads and building foundations. This condition presents a particular challenge in areas such as Marga Baru Simpang Sohan Village, Muara Lakitan District, Musi Rawas Regency, where this type of soil is common. Therefore, efforts are needed to improve the physical and mechanical properties of silt soil so that it can be used more safely as a base layer for construction. This study was conducted to examine the effect of coconut fiber ash and portland cement substitution on increasing the unconfined compressive strength of silt soil. Laboratory tests were conducted with varying mixtures of coconut fiber ash of 0%, 6%, 8%, and 11%, with the addition of 5% Portland cement in each variation. The samples were then tested over three curing periods: 0 day, 3 days, and 7 days. This process was conducted to determine the extent to which the substitution of these stabilizing materials increased soil strength. The results showed that the combination of coconut fiber ash and Portland cement significantly increased the unconfined compressive strength of the silt soil. The original soil, without the mixture, had a compressive strength of 0.35868 kg/cm². After the addition of 11% coconut fiber ash and 5% Portland cement without curing, the value increased to 0.85460 kg/cm², a 139.361% increase. After 7 days of curing, the compressive strength reached 2.87808 kg/cm², an increase of more than 173.620% compared to the original soil. Thus, the substitution of coconut fiber ash and Portland cement has proven to be an excellent solution for stabilizing silt soil and can be applied as a subgrade improvement method in road and building construction projects in areas with similar soil conditions. Keywords : silt soil, soil stabilization, Portland cement, coconut fiber ash, unconfined compressive strength. 1) : Mahasiswa Universitas Muhammadiyah Palembang 2) : Dosen Pembimbing 1 Universitas Muhammadiyah Palembang 3) : Dosen Pembimbing 2 Universitas Muhammadiyah Palembang

Item Type:	Thesis (Skripsi)
Additional Information:	1. Ir Nurnilam Oemiati, M.T 2. Ir Revisdah, M.T
Uncontrolled Keywords:	silt soil, soil stabilization, Portland cement, coconut fiber ash, unconfined compressive strength
Subjects:	Teknik Sipil > Konstruksi bawah tanah
Divisions:	Fakultas Teknik > Teknik Sipil (S1)
Depositing User:	Mahasiswa Fakultas Teknik
Date Deposited:	16 Sep 2025 03:20
Last Modified:	16 Sep 2025 03:20
URI:	http://repository.um-palembang.ac.id/id/eprint/33313

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