KHINANTI IDELLIA JATI, NIM. 112022070 (2026) PENGARUH SUBSTITUSI SEMEN PORTLAND DAN ABU CANGKANG SAWIT TERHADAP PENGUJIAN TRIAXIAL UU PADA STABILITAS TANAH LEMPUNG ANORGANIK BERPLASTISITAS TINGGI (CH). Skripsi thesis, Universitas Muhammadiyah Palembang.

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Abstract

THE EFFECT OF PORTLAND CEMENT AND PALM SHELL ASH SUBSTITUTION ON THE STABILITY OF HIGH-PLASTICITY INORGANIC CLAY (CH) BASED ON THE UNCONSOLIDATED UNDRAINED (UU) TRIAXIAL TEST ABSTRACT Khinanti Idellia Jati1, M. Arfan2, Verinazul Septriansyah3 Inorganic high-plasticity clay (CH) has low bearing capacity, high plasticity, and relatively low shear strength, making soil stabilization necessary before it can be used as a construction subgrade. One of the applicable methods is chemical stabilization using Portland cement and palm shell ash (PSA). This study aimed to investigate the effect of Portland cement and palm shell ash substitution on the shear strength parameters of clay based on the Unconsolidated Undrained (UU) Triaxial test and to determine the optimum mixture proportion and curing period that produce the highest cohesion and internal friction angle. This experimental research was conducted in the laboratory using clay soil obtained from Bumi Arjo Village, Lempuing District, Ogan Komering Ilir Regency, South Sumatra. The tests included physical properties, Standard Proctor compaction, and UU Triaxial testing. The mixtures consisted of 10% Portland cement combined with 15%, 17%, and 19% palm shell ash, with curing periods of 7 and 14 days. The results indicated that the substitution of Portland cement and palm shell ash improved the shear strength parameters of the clay. Both cohesion (c) and the internal friction angle (φ) increased with higher palm shell ash content and longer curing periods. The optimum mixture was obtained with 10% Portland cement and 19% palm shell ash cured for 14 days, resulting in a cohesion value of 3.55 kg/cm² and an internal friction angle of 30.40°. These findings demonstrate that the combination of Portland cement and palm shell ash is effective in improving the stability of clay soil and has the potential to serve as an environmentally friendly alternative for soil stabilization. Keywords: Clay soil, Soil stabilization, Portland cement, Palm shell ash, UU Triaxial. 1) : Student 2) : Supervisor 1 3) : Supervisor 2

Item Type:	Thesis (Skripsi)
Additional Information:	PEMBIMBING : 1. Muhammad Arfan, S.T., M.T. 2. Dr. Verinazul Septriansyah, S.T.,M.T.
Uncontrolled Keywords:	Keywords: Clay soil, Soil stabilization, Portland cement, Palm shell ash, UU Triaxial.
Subjects:	Teknik Sipil > teknik jalan raya
Divisions:	Fakultas Teknik > Teknik Sipil (S1)
Depositing User:	Mahasiswa Fakultas Teknik
Date Deposited:	19 Aug 2026 06:59
Last Modified:	19 Aug 2026 06:59
URI:	http://repository.um-palembang.ac.id/id/eprint/36996

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