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All Journal Jurnal Deformasi Media Ilmiah Teknik Sipil Jurnal Kacapuri : Jurnal Keilmuan Teknik Sipil Jurnal Ilmiah Teknik Sipil Transukma
Okrobianus Hendri
Universitas Palangka Raya
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Energy Environmental Science Materials Science & Nanotechnology Transportation

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Pengaruh Penambahan Abu Kayu, Kapur Dan Styrofoam Sebagai Bahan Campuran Pada Tanah Lempung Terhadap Nilai CBR: The Effect Of Adding Wood Ash, Lime And Styrofoam As Mixed Materials In Clay On CBR Value Febri Nuryadi Wicaksono; Fatma Sarie; Okrobianus Hendri
Media Ilmiah Teknik Sipil Vol. 10 No. 2 (2022): Media Ilmiah Teknik Sipil
Publisher : ​Institute for Researches and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/mits.v10i2.3592

Abstract

Building construction is influenced by the existing soil conditions. Clay soil is one of the soils that have deficiencies, both in bearing strength and the nature of the soil itself, so soil stabilization is needed. Soil stabilization is an attempt to improve soil properties. The purpose of this study was to analyze the physical and mechanical properties of the soil and to analyze the effect of wood ash, lime, and styrofoam on the CBR value. The soil samples were located in Tumbang Liting Village, Kasongan Lama Village, Katingan Regency, Central Kalimantan. To overcome this unstable soil, alternative materials were added in this study, the materials used were wood ash, lime, and styrofoam. The mixture of materials mentioned for stabilization is expected to improve soil properties. For the percentage of mixed variations, namely 5%, 7.5%, and 10%. Soil testing is carried out according to ASTM (American Society for Testing and Materials) standards. The results obtained from the test show that the CBR value of clay occurs in each variation of the mixture. For the percentage of the original soil, the CBR value was obtained by 3.05%. Soil yields with a mixture of wood ash, lime, and styrofoam with the highest CBR percentage values ​​occurred at variations of 5%, 7.5%, and 10% increased during the 7-day ripening period of 5.45%; 6.40%; 7.39%. For the highest design CBR value, there was a mixture of soil, wood ash, kapu, and styrofoam 10% 7-day curing of 7.39%, an increase of 142.30% from the original soil CBR, so that the mixture of native soil, wood ash, lime, and styrofoam had an effect on soil stabilization.
Hubungan Batas Cair Dan Indeks Plastisitas Tanah Lempung Disubstitusi Pasir Terhadap Nilai Kohesi Tanah Pada Uji Geser Langsung Ovit Yuvita Dewi; Okrobianus Hendri; Fatma Sarie
Jurnal Deformasi Vol 7, No 2 (2022): JURNAL DEFORMASI
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/deformasi.v7i2.8603

Abstract

Penelitian ini bertujuan untuk menganalisis sifat fisik dan sifat mekanik tanah lempung, menganalisis hubungan batas cair dan indeks plastisitas terhadap nilai kohesi (c) tanah yang telah diberi campuran pasir, dan menganalisis kuat geser tanah setelah dicampur dengan variasi campuran pasir sebesar 0%, 5%, 7,5% dan 10%. Hasil pengujian sifat fisik tanah lempung, kadar air (w) = 39,42%, berat isi tanah (γd) = 1,28 r/cm3, berat jenis (Gs) = 2,68, batas-batas Atterberg, Batas Cair (LL) = 42,72%, Batas Plastis (PL) = 25,02%, Batas Susut (SL) = 14,77%, Indeks Plastisitas (PI) = 17,70%, Analisis saringan persentase tanah lolos saringan No.200 = 52,46%. Berdasarkan klasifikasi AASHTO tanah diklasifikasikan sebagai tanah berlempung dalam kelompok A-7-6 (7) yang termasuk ke dalam tanah berlempung dengan kondisi sedang sampai buruk dan menurut sistem USCS tanah termasuk kelompok CL, lempung anorganik dengan plastisitas rendah sampai dengan sedang. Pada penelitian ini semakin kecil nilai batas cair dan indeks plastisitas akibat penambahan campuran pasir maka nilai kohesi tanah akan mengalami penurunan. Pengujian kuat geser langsung sampel tanah asli τ = 0,3439 kg/cm2 dan kuat geser sampel tanah dicampur pasir 10% = 0,2842 kg/cm2. Maka dapat disimpulkan bahwa penambahan campuran pasir pada tanah lempung mengakibatkan kuat geser tanah menurun
PENGARUH PENAMBAHAN SERAT SERABUT KELAPA TERHADAP KUAT GESER TANAH GAMBUT DI KOTA PALANGKA RAYA, KALIMANTAN TENGAH: THE EFFECT OF ADDING COCONUT FIBER TO THE SHEAR STRENGTH OF PEAT SOIL IN THE CITY OF PALANGKA RAYA, CENTRAL KALIMANTAN Cici Paramida; Fatma Sarie; Okrobianus Hendri
Jurnal Ilmiah Teknik Sipil TRANSUKMA Vol. 5 No. 1 (2022): Jurnal Penelitian TRANSUKMA
Publisher : Program Studi Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Balikpapan

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Abstract

Masalah  penurunan tanah gambut di kota Palangka Raya merupakan hal yang perlu diperhatikan dalam pekerjaan konstruksi pembangunan, terutama di Jl. Hiu Putih (lingkar luar) sehingga memerlukan stabilisasi pada tanah gambut tersebut. Tujuan penelitian yaitu menganalisis sifat fisik dan sifat mekanik tanah yang distabilisasikan dengan serat serabut kelapa. Hasil pemeriksaan sifat fisik tanah berdasarkan klasifikasi ASTM menunjukkan kadar air sebesar 560,91%  tergolong  kategori moderately absorbent, kadar abu sebesar 4,85% tergolong low ash, dan kadar serat sebesar 61,20%  tergolong Fibric, dan menurut klasifikasi Mac Farlane dan Radfofh (1985) tergolong Fibrous peat. Dalam klasifikasi USCS tergolong Pt (Peat). Hasil pemeriksaan sifat mekanik tanah asli memeproleh nilai sudut geser sebesar 12° dan nilai kohesi sebesar  0,099 kg/cm2 dan uji kuat geser sebesar  0,46885 kg/cm2 dengan nilai daya dukung tanah (qult) sebesar 1,52701 kg/cm2 dan nilai daya dukung ijin (qijin) sebesar 0,50901 kg/cm2. Nilai tertinggi uji kuat geser langsung  diperoleh pada campuran 90% tanah gambut dan 10% serat serabut kelapa dengan massa pemeraman 3 hari yaitu sebesar 0,67297 kg/cm2 dengan nilai daya dukung tanah (qult) sebesar 2,87152 kg/cm2 dan nilai daya dukung ijin (qijin) sebesar 0,95717 kg/cm2.   The problem of subsidence of peat soil in the city of Palangka Raya is a matter that needs to be considered in construction work, especially on Jl. Hiu Putih (Lingkar Luar) so that it requires stabilization on the peat soil with coconut fiber material. The purpose of this research is to analyze the physical properties of the soil, to analyze the mechanical properties of the soil which is stabilized with coconut fibers. The results of laboratory testing of the physical properties of the soil in ASTM showed that the water content of 560.91% was classified as moderately absorbent, the ash content of 4.85% was classified as low ash, and the fiber content of 61.20% was classified as Fibric, and according to Mac Farlane and Radrorth (1985) is classified as fibrous peat. In USCS classified as Pt (Peat). The results of laboratory testing of the original soil mechanical properties obtained a shear angle value of 12° and a cohesion value of 0.099 kg/cm2 and a shear strength test of 0.46885 kg/cm2 with a soil bearing capacity value (qult) of 1.52701 kg/cm2 and a strength value of 1.52701 kg/cm2. support permit (qijin) of 0.50901 kg/cm2. The highest value of direct shear strength test was obtained in a mixture of 90% peat soil and 10% coconut fiber fiber with a 3 day ripening mass of 0.67297 kg/cm2 with a soil bearing capacity value (qult) of 2.87152 kg/cm2 and a strength value of 2.87152 kg/cm2. permit support (qijin) of 0.95717 kg/cm2.
IDENTIFIKASI PERUBAHAN NILAI RESISTIVITAS TANAH GAMBUT AKIBAT CAMPURAN JAMUR RHIZOPUS OLIGOSPORUS: IDENTIFICATION OF CHANGES IN PEAT SOIL RESISTIVITY VALUE DUE TO MIXTURE OF RHIZOPUS OLIGOSPORUS RIFQI HADI; Stephanus Alexsander; Fatma Sarie; Suradji Gandi; Okrobianus Hendri
Jurnal Ilmiah Teknik Sipil TRANSUKMA Vol. 5 No. 2 (2023): Jurnal Penelitian Transukma
Publisher : Program Studi Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Balikpapan

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Abstract

Telah dilakukan penelitian identifikasi perubahan nilai resistivitas tanah gambut akibat pencampuran jamur rhizopus oligosporus (10:1). Resistivitas tanah gambut diukur menggunakan metode geolistrik resistivitas konfigurasi wenner alfa. Pengambilan data dilakukan pada skala laboratorium dengan panjang kotak 4 (empat) meter dan jarak antar elektroda 10 cm. Pengukuran resistivitas tanah gambut dilakukan dengan dua tahap yaitu sebelum dan sesudah diberikan campuran jamur rhizopus oligosporus. Data resistivitas tanah gambut dipetakan dalam bentuk 2 (dua) dimensi menggunakan perangkat lunak res2dinv dengan variasi pemeraman rentang waktu dimulai dari 5 hari, 10 hari dan 15 hari. Hasil uji laboratorium pencampuran jamur rhizopus oligosporus terhadap perubahan resistivitas menunjukkan nilai resistivitas tanah gambut sebelum diberikan perlakuan berkisar 13,5-48,2 Ωm, sedangkan nilai resistivitas tanah gambut pada pemeraman 5 hari setelah diberi perlakuan berkisar 8,36-33,4 Ωm, pada rentang 10 hari pemeraman berkisar 5,18-23,3 Ωm dan pada rentang 15 hari berkisar 17,1-58,0 Ωm. Perubahan resistivitas tanah gambut yang paling signifikan terjadi pada rentang waktu 15 hari setelah pencampuran dan dengan rata-rata kesalahan iterasi 30%.   Research has been carried out to identify changes in the resistivity value of peat soil due to the mixing of the fungus Rhizopus oligosporus (10:1). The resistivity of peat soil was measured using the geoelectrical resistivity method of the Wenner alpha configuration. Data collection was carried out on a laboratory scale with a box length of 4 (four) meters and a distance between electrodes of 10 cm. Peat soil resistivity measurement was carried out in two stages, namely before and after being given a mixture of the fungus Rhizopus oligosporus. Peat soil resistivity data were mapped in 2 (two) dimensions using the res2dinv software with variations in curing time ranging from 5 days, 10 days and 15 days. The results of the laboratory test of mixing the fungus rhizopus oligosporus against changes in resistivity showed that the resistivity value of peat soil before treatment was around 13.5-48.2 Ωm, while the resistivity value of peat soil at 5 days curing after being treated ranged from 8.36-33.4 Ωm, in the range of 10 days of curing ranged from 5.18-23.3 Ωm and in the range of 15 days it ranged from 17.1 to 58.0 Ωm. The most significant change in resistivity of peat soil occurred in the 15 days after mixing and with an average iteration error of 30%.
Co-Authors Aditia Putra Pratama Situmorang Berlin Bondan Pratama Cici Paramida Edo Aristianto Fatma Sarie Febri Nuryadi Wicaksono Jeremi Sitinjak Junior Apik Pasaribu M Ikhwan Yani Ovit Yuvita Dewi Poni Yulianti REYMONDO MONDO RIFQI HADI Sasmi Fransisca Oktaviana Stephanus Alexsander Suradji Gandi