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All Journal Potensi : Jurnal Sipil Politeknik Jurnal Pensil : Pendidikan Teknik Sipil Jurnal Teknik Sipil
Sagala, Sandy D
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Civil Engineering, Building, Construction & Architecture Education Engineering Transportation Other

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Sustainable Soil Improvement: Soft Clay Stabilization Using Rice Husk Hush and Waste Spent Catalyst RCC 15 Sagala, Sandy D; S, Syahril; Purba, Dian Adiputra; Marques, Alexandre
Potensi: Jurnal Sipil Politeknik Vol. 27 No. 1 (2025): Potensi: Jurnal Sipil Politeknik
Publisher : Department of Civil Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/potensi.v27i1.6518

Abstract

This study explores the chemical stabilization of soft clay soil to enhance its bearing capacity and improve its performance under structural loads. A fixed proportion of Rice Husk Ash (RHA) at 6% by weight was combined with varying amounts of spent catalyst RCC 15 (5%, 7%, 9%, and 11%) as stabilizing agents. The experimental program included the characterization of soil index properties, followed by engineering tests with emphasis on Unconfined Compressive Strength (UCS), Atterberg limits, compaction characteristics, and California Bearing Ratio (CBR). The Atterberg limit tests indicated a consistent reduction in the plasticity index (PI) with increasing RCC content, reflecting improved soil stability. Compaction results showed an increase in Maximum Dry Density (MDD) and a decrease in Optimum Moisture Content (OMC), with the highest MDD (13.29 kN/m³) and an OMC of 25.67% achieved at 6% RHA and 11% RCC. UCS values increased progressively, reaching a maximum of 1.822 kg/cm² with the same mixture. CBR results further supported these findings, with unsoaked values increasing from 4.75% to 6.60%, and soaked values from 3.30% to 6.20%. The combined use of RHA and RCC 15 significantly improves the geotechnical properties of soft clay, highlighting its potential as a sustainable and effective construction material.
PENINGKATAN SIFAT TANAH LIAT DENGAN KALSIT DAN SILICA FUME: KUAT TEKAN BEBAS Purba, Dian Adiputra; Syahril; Sagala, Sandy D
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 2 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i2.54156

Abstract

This study investigates the enhancement of clay soil properties by adding calcite and silica fume to address challenges such as low bearing capacity and high compressibility. A total of 51 soil samples were prepared, with 3 samples for each variant, treated with 5% calcite and varying silica fume concentrations (6%, 8%, 10%, 12%). The samples were cured for 0, 3, 7, and 14 days. Unconfined compressive strength (UCS) tests were conducted to evaluate the mechanical properties. Results revealed significant improvements, with UCS increasing from 0.412 kg/cm² in untreated soil to 1.724 kg/cm² in samples treated with 5% calcite and 12% silica fume after 14 days of curing. These values meet or exceed typical strength requirements for construction purposes, reinforcing the effectiveness of calcite and silica fume as stabilizing agents. The enhancement is attributed to the pozzolanic reaction between the additives and the soil, forming calcium silicate hydrate (CSH) and strengthening the soil's microstructure. The findings indicate that calcite and silica fume effectively improve soil stability, offering a promising solution for geotechnical applications. Future research should focus on evaluating the long-term stability of treated soils under various environmental conditions and exploring additional curing methods to optimize the chemical reactions further.
PERBAIKAN TANAH BERKELANJUTAN: STABILISASI TANAH LEMPUNG LUNAK MENGGUNAKAN ABU SEKAM PADI DAN SPENT CATALYST RCC 15 Sagala, Sandy D; S, Syahril; Purba, Dian Adiputra
JURNAL TEKNIK SIPIL Vol 14, No 2 (2025): Volume 14 Nomor 2 November 2025
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jts.v14i2.45173

Abstract

Stabilisasi tanah lempung lunak menggunakan abu sekam padi (ASP) dan spent catalyst RCC 15 telah dilakukan untuk meningkatkan sifat mekanis dan strukturalnya. Pengujian Atterberg limit menunjukkan bahwa indeks plastisitas (PI) tanah asli sebesar 29,45% menurun menjadi 25,55% setelah distabilisasi dengan 6% ASP dan 11% RCC 15, menandakan peningkatan stabilitas tanah akibat reaksi pozzolanik yang mengurangi plastisitas. Pada uji pemadatan, penambahan RCC 15 dan ASP meningkatkan berat isi kering maksimum (d maks) dari 12,93 kN/m menjadi 13,29 kN/m, serta sedikit menurunkan kadar air optimum (OMC) menjadi 25,67%, yang menunjukkan peningkatan kepadatan dan daya pemadatan tanah. Pada pengujian kuat tekan bebas (UCS), kuat tekan tanah asli sebesar 0,412 kg/cm meningkat menjadi 1,822 kg/cm setelah 7 hari peram dan mencapai 2,309 kg/cm setelah 14 hari peram. Peningkatan ini menunjukkan bahwa masa peram berperan dalam memperkuat struktur tanah melalui pembentukan senyawa kalsium silikat hidrat (C-S-H) yang memperbaiki kekuatan tanah. Hasil uji CBR juga menunjukkan peningkatan daya dukung tanah, di mana pada kondisi tanpa perendaman, nilai CBR tanah asli meningkat dari 4,75% menjadi 7,30% setelah 14 hari peram, sementara pada kondisi terendam, nilai CBR meningkat dari 3,30% menjadi 6,50%. Secara keseluruhan, kombinasi ASP dan RCC 15 terbukti meningkatkan sifat fisik dan mekanis tanah, dengan masa peram yang lebih lama berkontribusi pada stabilisasi yang lebih optimal. Hasil ini menunjukkan bahwa penggunaan ASP dan RCC 15 dapat menjadi solusi efektif dalam meningkatkan kualitas tanah lempung lunak untuk berbagai aplikasi konstruksi.
Co-Authors Marques, Alexandre Purba, Dian Adiputra s, Syahril Syahril