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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Nusantara Civil Engineering Journal
Ezra Hartarto Pongtuluran
Balikpapan State Polytechnic
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences

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Stabilisasi tanah lempung dengan menggunakan limbah sampel uji kuat tekan beton dan pengaruhnya terhadap nilai daya dukung tanah Bayu Wiyata Prawira; Tatag Yufitra Rus; Ezra Hartarto Pongtuluran
Nusantara Civil Engineering Journal Vol 3 No 1 (2024): Nusantara Civil Engineering Journal
Publisher : Civil Engineering Dept, Balikpapan State Polytechnics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/nuce.v3i1.494

Abstract

Tanah lempung memiliki kembang susut dan daya dukung rendah. Pembuatan beton menghasilkan limbah berupa sampel uji kuat tekan beton yang berdampak negatif pada lingkungan. Penelitian ini bertujuan menggunakan limbah sampel uji kuat tekan beton sebagai bahan stabilisasi tanah lempung, meningkatkan daya dukung tanah dan mengurangi dampak lingkungan. Tujuan penelitian ini adalah mengevaluasi pengaruh limbah beton terhadap daya dukung tanah lempung melalui pengujian CBR unsoaked. Metodologi penelitian yang digunakan adalah jenis penelitian eksperimental. Pengujian dilakukan terhadap tanah asli dengan mengukur kadar air, melakukan analisa saringan, menguji atterberg limit, mengukur berat jenis, dan berat volume. Data hasil pengujian akan digunakan untuk mengklasifikasikan jenis tanah menggunakan metode USCS. Selanjutnya, dilakukan pengujian pemadatan tanah ringan untuk mendapatkan nilai kadar air optimum dan berat isi kering maksimum. Data ini akan digunakan dalam pengujian CBR Laboratorium unsoaked pada tanah asli serta pengujian CBR Laboratorium unsoaked dengan campuran limbah beton dalam variasi 5%, 10%, 15%, 20%, dan 25%. Berdasarkan hasil pengujian laboratorium dan analisis data tanah asli serta tanah yang dicampur dengan limbah sampel uji kuat tekan beton, ditemukan bahwa nilai CBR pada tanah asli di sekitar workshop Teknik Sipil Poltekba di Balikpapan Utara, Kalimantan Timur adalah 10,78%. Hasil pengujian CBR menunjukkan bahwa penambahan limbah beton sebesar 5%, 10%, 15%, 20%, dan 25% menghasilkan peningkatan nilai CBR secara berturut-turut menjadi 13,48%, 15,75%, 18,88%, 22,69%, dan 26,87%. Dengan demikian, dapat disimpulkan bahwa penggunaan limbah sampel uji kuat tekan beton dapat meningkatkan daya dukung tanah lempung. Penelitian ini memberikan kontribusi dalam pengembangan teknologi stabilisasi tanah yang efektif dan ramah lingkungan.
Perencanaan bak kontrol dalam pengendalian sedimentasi pada saluran drainase STA 18+850 sampai dengan 19+325 jalan poros Samarinda-Bontang Farisca Sasti Gadis Setiawan; Ezra Hartarto Pongtuluran; Mariatul Kiptiah
Nusantara Civil Engineering Journal Vol 3 No 1 (2024): Nusantara Civil Engineering Journal
Publisher : Civil Engineering Dept, Balikpapan State Polytechnics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/nuce.v3i1.532

Abstract

Arterial road Samarinda-Bontang often experiences flooding due to the accumulation of sediment in the channels, leading to a reduction in their capacity. This study aims to determine the erosion rate that will occur around the channels, the sedimentation rate that will occur in the channels, and to design the necessary dimensions for a control structure in the channels. The analysis and calculations were conducted using the Universal Soil Loss Equation (USLE) method to estimate the sedimentation volume for the next 10 years. The calculations were carried out using Microsoft Excel software, carefully following appropriate steps, resulting in the sedimentation volume figure used for the design of the control structure. From the analysis, it was found that the rainfall erosivity factor (R) is 13,588.02 Ton.mm/year, the soil erodibility factor (K) is 0.08, the length and slope factor (LS) is 3.68, and the Sediment Delivery Ratio (SDR), which represents the average proportion of sediment transported to the channel to the total erosion in the river basin, is 0.0941. These values yielded a potential erosion rate of 2,837.96 Ton/km²/year, an actual erosion rate of 1,557.002 Ton/km²/year, and a potential sedimentation rate of 146.5529 Ton/km²/year. Based on these values, the projected sedimentation volume in the channels over a 10-year period is 556.81 m³. Therefore, a control structure with dimensions of 20m in length, 2m in width, and 13.92m in depth, or alternatively 20m in length, 2m in width, and 1.39m in depth, is required for a planning period of 1 year.
Hydrodynamic Control of Suspended Sediment Transport and Coastal Morphodynamics in Tropical Estuarine Systems Under Environmental Pressure: A Case Study of Balikpapan Bay Hadi Hermansyah; Emil Azmanajaya; Sabhan Sabhan; Sushilawati Ismail; Rahmat Bangun Giarto; Ezra Hartarto Pongtuluran; Indriasri Raming
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 31, No 3 (2026): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.31.3.291-308

Abstract

Balikpapan Bay has large and small river estuaries, including the Sepaku River, the Wain River, and the Riko River. The watershed of Balikpapan Bay has a fairly important and strategic role, including as a buffer for the sustainable function of the bay as a seaport for Balikpapan and a source of income for the surrounding community as well as the life of the bay's marine ecosystem.The purpose of this study was to determine the distribution pattern of Total Suspended Solid (TSS)s and changes in the morphology of Balikpapan Bay based on the tidal flow pattern model using the 3-dimensional Mohid model approach. Data collection was carried out on 3rd-20thSeptember 2024. The model used is a hydrodynamic model with bathymetry data and tidal data as the main drivers and secondary data, namely the constant Total Suspended Solid concentration as the input value in model processing. The distribution of very high Total Suspended Solid concentrations occurs at full moon tide until it reaches the mouth of Balikpapan Bay, the area with the highest sediment concentration, namely the Sepaku Bear River ranges from 200-250 mg.L-1 and at the mouth of Balikpapan Bay it ranges from 50-100 mg.L-1. Erosion occurs in the Jenebora area, part of the Kariangau area, and the eastern part of the bay, especially on the coast of Kemala Balikpapan. The observed pattern—elevated TSS during neap or spring-tide conditions and near the estuary mouth, tidal forcing and riverine inputs shape SSC distributions and estuarine turbidity maxima (ETM). Balikpapan Bay could develop an ETM in the vicinity of the river mouths or the estuarine channel mouth under similar forcing, with stronger sediment exchange during higher-energy tidal phases. The Balikpapan Bay results indicate a robust coupling between tidal flow, sediment transport, and estuarine morphodynamics, with significant implications for port operations, coastal resilience, and ecosystem health. High TSS in riverine plumes and erosion hotspots along the coast imply a dynamic sediment regime that will influence dredging needs, shoreline stability, and habitat conditions.
Co-Authors Bayu Wiyata Prawira Emil Azmanajaya Farisca Sasti Gadis Setiawan Hadi Hermansyah Indriasri Raming Mariatul Kiptiah Rahmat Bangun Giarto Sabhan Sabhan Sushilawati Ismail Tatag Yufitra Rus