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Teras Jurnal
Published by Universitas Malikussaleh
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Core Subject : Social, Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Environmental Science
Teras Jurnal is a journal that communicates the results of research within the scope of civil engineering and scientific development as well as aspects of practitioners. The process of manuscript submission is open throughout the year. All submitted manuscript will be screened with double-blind peer review and editorial review before they are accepted to publish. Teras Jurnal receives a manuscript from the following area below civil engineering science and development with the interdisciplinary and multidisciplinary approach:
Arjuna Subject : -
Articles 417 Documents
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Analisis Debit Aliran pada Saluran Utama di Lahan Gambut Tropis serta Pengaruhnya Terhadap pH dan Nitrat Raihansyah, Muhammad Naufal; Yupi, Haiki Mart; Nindito, Dwi Anung
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1327

Abstract

Abstrak   Desa Kalampangan terletak di kawasan lahan gambut tropis. Lahan gambut memiliki fungsi sebagai penyimpan air dan karbon, namun sebagian besar lahan gambut di Indonesia terdapat saluran drainase. Keberadaan saluran ini berpotensi menimbulkan masalah terhadap aliran dan permukaan air tanah. Selain itu, saluran ini berpotensi membawa air limpasan dari lahan gambut yang tercemar limbah perkebunan di sekitar saluran. Nitrat merupakan salah satu hasil dari limbah perkebunan yang dapat merusak lingkungan. Tujuan penelitian ini adalah untuk menganalisis debit aliran dan pengaruhnya terhadap tingkat pencemaran air dengan parameter pH dan nitrat. Debit aliran dihitung berdasarkan data pengukuran kecepatan aliran dan profil saluran, sedangkan data kualitas air diperoleh dari hasil pengujian lapangan dan laboratorium. Hasil penelitian menunjukkan bahwa peningkatan tinggi muka air berbanding lurus dengan kenaikan debit aliran pada saluran. Debit aliran merupakan salah satu faktor dominan yang memengaruhi variasi konsentrasi nitrat (NO3-N), namun tidak menunjukkan pengaruh signifikan terhadap nilai pH air di lahan gambut tropis.   Kata kunci: Lahan gambut tropis, debit aliran, tinggi muka air, kualitas air, saluran lahan gambut     Abstract   Kalampangan Village is located in a tropical peatland area. Peatlands serve as water and carbon storage, however most peatlands in Indonesia have drainage channels. The existence of these channels has the potential to cause problems with groundwater flow and surface water. In addition, these channels have the potential to carry runoff water from peatlands contaminated with plantation waste around the channels. Nitrate is one of the products of plantation waste that can damage the environment. The purpose of this study is to analyze the flow discharge and its effect on water pollution levels using pH and nitrate parameters. Flow discharge were calculated based on flow velocity measurements and channel profiles, while water quality data were obtained from field and laboratory tests. The results showed that an increase in water level was directly proportional to an increase in flow discharge in the channels. Flow discharge is one of the dominant factors affecting nitrate (NO3-N) concentration variation, but it does not have a significant effect on water pH in tropical peatlands.   Keywords: Tropical peatlands, flow discharge, high water level, water quality, peat channel
The Evaluasi Kinerja Rutting Campuran Aspal PG76 Menggunakan Filler Zeolit Alam: Evaluasi Kinerja Rutting Campuran Aspal PG76 Menggunakan Filler Zeolit Alam Catur Marina, Bernaditha; Tambunan, Hermon Frederik; Tobing, Yohana Westi Lumban; Sipayung, Boy Hasiholan
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1328

Abstract

Abstrak   Kerusakan alur (rutting) pada perkerasan aspal di wilayah tropis dipercepat oleh temperatur tinggi dan beban lalu lintas berulang. Studi ini mengevaluasi ketahanan rutting campuran AC-WC dengan filler zeolit alam pada dua jenis pengikat, aspal konvensional Pen 60/70 dan aspal termodifikasi polimer PG76. Uji Marshall digunakan untuk menentukan Kadar Aspal Optimum (KAO) dan kadar zeolit optimum pada substitusi 0%, 25%, 50%, 75%, dan 100%, termasuk parameter volumetrik dan Indeks Kekuatan Sisa (IKS). Kinerja rutting diuji menggunakan wheel tracking machine pada 25oC, 45oC, dan 60oC. KAO diperoleh 6,575% untuk Pen 60/70 dan 6,475% untuk PG76, dengan kadar zeolit optimum berturut-turut 25% dan 50%. Pada temperatur tinggi, campuran PG76 menunjukkan deformasi lebih rendah dan stabilitas dinamis lebih tinggi dibanding Pen 60/70. Ketahanan rutting terbaik dicapai oleh PG76 dengan 50% zeolit sebesar 1431,82 lintasan/mm, lebih tinggi daripada Pen 60/70 dengan 25% zeolit sebesar 828,95 lintasan/mm.   Kata Kunci: Rutting (Alur), Volumetrik, Zeolit Alam, PG76, Wheel Tracking Machine     Abstract   Rutting in tropical asphalt pavements is accelerated by high temperatures and repeated traffic loading. Therefore, improving filler selection and binder modification is critical for durability. This study evaluates the rutting resistance of AC-WC mixtures using natural zeolite filler with two binders: conventional Pen 60/70 and polymer-modified PG76. Marshall testing determined the Optimum Asphalt Content (OAC) and optimum zeolite dosage at 0%, 25%, 50%, 75%, and 100%, along with volumetric properties and the Retained Strength Index (RSI). Rutting performance was assessed using a wheel-tracking machine at 25 °C, 45 °C, and 60 °C to assess temperature susceptibility. The OACs were 6,575% (Pen 60/70) and 6,475% (PG76), with optimum zeolite contents of 25% and 50%, respectively. At elevated temperatures, PG76 mixtures showed lower permanent deformation and higher dynamic stability than Pen 60/70. The best performance was PG76 with 50% zeolite: 1431,82 passes/mm, compared with 828,95 passes/mm for Pen 60/70 with 25% zeolite.   Keywords: Rutting, Volumetrik, Zeolite, PG76, Wheel Tracking Machin
Analisis Multidimensional Scalling dalam Menilai Proyek Pembangunan Bendungan Manikin di Kabupaten Kupang Usboko, Gregorius Paus; Abani, Godelfridus Alfred; Bees, Azarya; Lulu, Laurensius
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1332

Abstract

Abstrak   Pembangunan Bendungan Manikin merupakan langkah strategis nasional untuk meningkatkan ketahanan air di Pulau Timor yang rawan kekeringan berkepanjangan. Penilitian ini bertujuan menilai tingkat keberlanjutan proyek bendungan Manikin di Kabupaten Kupang menggunakan pendekatan Multidimensional Scaling (MDS). Evaluasi dilakukan terhadap lima dimensi keberlanjutan yaitu ekologi, ekonomi, sosial, teknologi dan kelembagaan. Data diperoleh melalui survei lapangan, wawancara stakeholder terkait, serta penilaian atribut keberlanjutan yang relevan dengan kondisi regional. Hasil analisis menunjukkan bahwa proyek pembangunan Bendungan Manikin berada pada kategori cukup berkelanjutan dengan indeks multidimensi sebesar 54,76. Dimensi ekologi, ekonomi dan sosial menunjukkan kinerja relatif lebih baik, sedangkan dimensi teknologi dan kelembagaan menjadi aspek paling sensitif dan memerlukan perhatian khusus. Temuan ini menegaskan bahwa metode MDS efektif sebagai alat evaluasi keberlanjutan proyek infrastruktur yang masih dalam tahapan konstruksi untuk mendukung pengambilan keputusan adaptif.   Kata Kunci: Pulau Timor, Bendungan Manikin, Keberlanjutan, Multidimensional Scaling, Ketahanan Air     Abstract   The construction of the Manikin Dam is a national strategic project aimed at enhancing water resilience on Timor Island, a region highly vulnerable to prolonged droughts. This study evaluates the sustainability level of the Manikin Dam project in Kupang Regency using a Multidimensional Scaling (MDS) approach. The assessment covers five sustainability dimensions: ecological, economic, social, technological, and institutional. Data were collected through field surveys, stakeholder interviews, and the evaluation of sustainability attributes relevant to regional drought conditions. The results indicate that the Manikin Dam project falls into the moderately sustainable category, with a multidimensional sustainability index of 54.76. The ecological, economic, and social dimensions show relatively better performance, while the technological and institutional dimensions are the most sensitive and require priority improvement. These findings confirm that MDS is an effective tool for evaluating the sustainability of infrastructure projects during the construction phase to support adaptive and informed decision-making.   Keywords: Timor Island, Manikin Dam, Sustainability, Multidimensional Scaling, Water Resilience
Inovasi Teknologi SCGC (Self Compacting Geopolymer Concrete) Sebagai Material Berkelanjutan Anik; Cahyono, Dhamang Budi; Purnijanto, Bambang; Budiningrum, Diah Setyati
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1334

Abstract

Abstrak   Beton geopolimer merupakan beton tanpa semen sebagai bahan pengikat, dipandang sebagai solusi mengatasi pemanasan global akibat produksi semen portland dan alternatif pengganti beton konvensional. Beton geopolimer segar memiliki kekentalan kaku yang tidak workable, padahal workability sangat dibutuhkan dalam proses pengecoran di lapangan. Untuk mengatasi masalah ini, dikembangkan inovasi Self Compacting Concrete (SCC) yang dapat memadat sendiri tanpa alat pemadat. Beberapa metode untuk mendapatkan sifat self compacting meliputi pengaturan kadar agregat, rasio air, dan penggunaan superplasticizer. Penambahan superplasticizer membuat geopolimer lebih workable dengan setting time lebih lama. Pengujian menggunakan slump flow, v funnel, dan box test. Penelitian ini menganalisis kinerja Self Compacting Geopolymer Concrete (SCGC) menggunakan fly ash PLTU Tanjungjati B sebagai pengganti semen. Hasil pengujian menunjukkan campuran berhasil diformulasikan sebagai SCGC berperforma tinggi dengan keseimbangan sangat baik antara fluiditas, stabilitas, dan kemampuan melewati celah sempit. Beton ini efektif untuk aplikasi pada elemen struktur dengan geometri rumit dan penulangan padat, berpotensi meningkatkan efisiensi konstruksi, mengurangi pemadatan mekanis, dan menjamin kepadatan optimal di seluruh struktur.   Kata kunci: SCGC, Fly ash, Slump Flow, V Funnel, Box test   Abstract   Geopolymer concrete is concrete without cement as a binding material, seen as a solution to global warming caused by Portland cement production and an alternative to conventional concrete. Fresh geopolymer concrete has a stiff consistency that is not workable, even though workability is very much needed in the casting process in the field. To overcome this problem, Self Compacting Concrete (SCC) innovation has been developed, which can compact itself without compaction tools. Several methods to obtain self-compacting properties include adjusting the aggregate content, water ratio, and the use of superplasticizers. The addition of superplasticizers makes geopolymers more workable with a longer setting time. Testing was carried out using slump flow, V-funnel, and box tests. This study analyzes the performance of Self-Compacting Geopolymer Concrete (SCGC) using fly ash from the Tanjungjati B power plant as a cement substitute. The test results show that the mixture was successfully formulated as high-performance SCGC with an excellent balance between fluidity, stability, and the ability to pass through narrow gaps. This concrete is effective for applications in structural elements with complex geometries and dense reinforcement, potentially increasing construction efficiency, reducing mechanical compaction, and ensuring optimal density throughout the structure.   Keywords: SCGC, Slump Flow, V-Funnel, Box Test
KINERJA CAMPURAN ASPAL BETON PORUS MENGGUNAKAN ASPAL KARET ALAM PADAT sumiati, Sumiati; Situmeang, Sheragizca Yolanda; Aszharri, Arief
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1337

Abstract

Abstrak   Aspal beton padat memiliki permeabilitas rendah sehingga air hujan sulit meresap, yang berpotensi menimbulkan genangan dan menurunkan keselamatan lalu lintas. Aspal beton porus dikembangkan sebagai alternatif dengan struktur gradasi terbuka yang menghasilkan rongga saling terhubung, sehingga memungkinkan air mengalir ke lapisan bawah perkerasan. Namun, karakteristik ini umumnya berdampak pada penurunan stabilitas campuran. Penelitian ini bertujuan menganalisis pengaruh jenis aspal dan gradasi agregat terhadap kinerja mekanik dan hidrologis aspal beton porus. Variasi yang digunakan meliputi aspal termodifikasi AKAP PG-76 dan aspal konvensional PEN 60/70, serta gradasi agregat AAPA dan British Standard. Benda uji disiapkan dari kombinasi kedua jenis aspal dan gradasi, kemudian diuji menggunakan pengujian Marshall, Cantabro, dan permeabilitas. Hasil penelitian menunjukkan bahwa penggunaan AKAP PG-76 meningkatkan stabilitas Marshall dan ketahanan keausan campuran, sedangkan variasi gradasi agregat berpengaruh signifikan terhadap nilai permeabilitas. Temuan ini memberikan dasar teknis dalam pemilihan kombinasi material untuk meningkatkan kinerja aspal beton porus. Kata kunci: Aspal beton porus; Stabilitas Marshall; Permeabilitas; Gradasi agregat; Uji Cantabro     Abstract   Dense asphalt concrete has low permeability, which limits rainwater infiltration and may cause surface ponding that reduces traffic safety. Porous asphalt concrete has been developed as an alternative by employing an open-graded structure with interconnected voids, allowing water to drain into underlying pavement layers. However, this characteristic often leads to lower mixture stability compared to conventional asphalt concrete, requiring a balance between mechanical and hydraulic performance. This study analyzes the effects of asphalt type and aggregate gradation on the mechanical and hydrological performance of porous asphalt concrete. The variables include modified asphalt AKAP PG-76 and conventional asphalt PEN 60/70, as well as AAPA and British Standard aggregate gradations. Specimens were prepared from combinations of asphalt types and gradations and evaluated using Marshall stability, Cantabro abrasion resistance, and permeability tests. The results indicate that AKAP PG-76 improves Marshall stability and abrasion resistance, while aggregate gradation plays a dominant role in controlling permeability. These findings provide insight into optimizing porous asphalt mixtures through binder modification and gradation design.   Keywords: Porous asphalt concrete; Marshall stability; Permeability; Aggregate gradation; Cantabro test
Estimasi Emisi Karbon pada Pelaksanaan Konstruksi Cetak Sawah di Kecamatan Sebangau Kuala, Kabupaten Pulang Pisau K.A.UDA, SUBRATA ADITAMA; Kittie Uda , Saritha; DEVIA
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1338

Abstract

Abstrak   Kegiatan konstruksi, termasuk pembangunan infrastruktur pertanian seperti cetak sawah, merupakan salah satu kontributor signifikan terhadap emisi gas rumah kaca (GRK), khususnya karbon dioksida (CO2). Konstruksi cetak sawah melibatkan serangkaian aktivitas, seperti pembukaan lahan, pengolahan tanah, transportasi material, dan operasi alat berat, yang berpotensi melepaskan karbon tersimpan, baik di atas permukaan (biomassa) maupun di dalam tanah (karbon tanah). Oleh karena itu, identifikasi potensi emisi karbon dari kegiatan ini menjadi sangat penting sebagai langkah awal dalam merumuskan strategi pembangunan pertanian yang berkelanjutan dan rendah karbon. Penelitian ini bertujuan untuk menghitung estimasi emisi CO₂ yang dihasilkan oleh alat berat berdasarkan konsumsi bahan bakar, durasi operasi, dan faktor emisi serta material konstruksi yang digunakan. Hasil menunjukkan bahwa alat berat dengan konsumsi solar terbesar memberikan kontribusi tertinggi terhadap total emisi. Hasil penelitian menunjukkan 96,47% emisi karbon dihasilkan dari penggunaan alat berat excavator, sedangkan sisanya berasal dari transportasi (0,13%) dan material konstruksi (3,40%). Emisi karbon yang dihasilkan sebagian besar dari konsumsi bahan bakar minyak (fosil) sehingga perlu adanya upaya meminimalisasi atau mengganti penggunaan bahan bakar fosil dengan energi terbarukan dan ramah lingkungan.     Kata Kunci: Emisi Karbon (CO2), Konstruksi Cetak sawah, alat berat dan material   Abstract Construction activities, including the development of agricultural infrastructure such as rice field cultivation, are a significant contributor to greenhouse gas (GHG) emissions, particularly carbon dioxide (CO2). Rice field construction involves a series of activities, such as land clearing, soil cultivation, material transportation, and heavy equipment operation, which have the potential to release stored carbon, both above ground (biomass) and in the soil (soil carbon). Therefore, identifying the potential carbon emissions from these activities is very important as a first step in formulating sustainable and low-carbon agricultural development strategies. This study aims to calculate the estimated CO₂ emissions generated by heavy equipment based on fuel consumption, duration of operation, and emission factors and construction materials used. The results show that heavy equipment with the highest diesel consumption contributes the most to total emissions. The results show that 96.47% of carbon emissions are generated from the use of excavators, while the rest comes from transportation (0.13%) and construction materials (3.40%). Carbon emissions are mostly generated from the consumption of fossil fuels, so efforts are needed to minimize or replace the use of fossil fuels with renewable and environmentally friendly energy.     Keywords: Carbon Emissions (CO2), Rice Field Construction, Heavy Equipment and Materials
Pengendalian Proyek Perumahan Permata Hijau Menggunakan Metode Earned Value: Permata Hijau Housing Project Control Using the Earned Value Method junna, isra; Setyobudi, Risang; Apriansyah, muh; Fikar, M. Ziaul; Zulfikar, M. Deta
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1339

Abstract

Abstrak   Pembangunan perumahan merupakan sektor penting dalam industri konstruksi yang menuntut pengelolaan waktu, biaya, dan kualitas secara efektif. Proyek Permata Hijau menghadapi risiko keterlambatan, pembengkakan biaya, dan ketidaksesuaian hasil pekerjaan, sehingga diperlukan sistem pengendalian yang mampu mengidentifikasi masalah sejak awal. Penelitian ini menerapkan metode Earned Value Management (EVM) untuk mengevaluasi kinerja proyek berdasarkan data pelaksanaan selama 25 minggu. Hasil analisis menunjukkan bahwa proyek berjalan sesuai jadwal dengan nilai Schedule Performance Index (SPI) sebesar 1,00. Namun, proyek mengalami pembengkakan biaya yang ditunjukkan oleh nilai Cost Performance Index (CPI) sebesar 0,99 dan Cost Variance (CV) sebesar Rp795.356,49. Kurva S memperlihatkan pola pelaksanaan proyek konstruksi yang lambat di awal, meningkat di tengah, dan melambat di akhir. Temuan ini menegaskan pentingnya kemampuan manajerial dalam mengendalikan biaya dan menjaga kesesuaian antara perencanaan dan pelaksanaan proyek.   Kata kunci: Earned Value Management, Pengendalian Proyek, Kinerja Biaya, Kinerja Waktu     Abstract Housing development is a crucial sector within the construction industry, requiring effective management of time, cost, and quality. The Permata Hijau Project faces risks of delays, cost overruns, and discrepancies between planned and actual work outcomes, necessitating a control system capable of identifying issues early. This study applies the Earned Value Management (EVM) method to evaluate project performance based on 25 weeks of implementation data. The analysis shows that the project is progressing on schedule, indicated by a Schedule Performance Index (SPI) of 1.00. However, cost overruns are evident, with a Cost Performance Index (CPI) of 0.99 and a Cost Variance (CV) of Rp795,356.49. The S-curve illustrates a typical construction pattern, starting slowly, rising sharply in the middle phase, and slowing toward completion. These findings highlight the importance of managerial capability in controlling costs and ensuring alignment between project planning and execution.   Keywords: Earned Value Management, Project Control, Cost Performance, Time Performance
Studi Eksperimental Pemanfaatan Abu Pelepah Pisang sebagai Substitusi Semen pada Beton: Studi Eksperimental Pemanfaatan Abu Pelepah Pisang sebagai Substitusi Semen pada Beton Ulfa, Anis Aulia; Giarto, Rahmat Bangun; Achmad, Karmila; Kiptiah, Mariatul; Fatmawati, Fatmawati
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1340

Abstract

Abstrak   Penelitian ini bertujuan untuk menganalisis pengaruh substitusi abu pelepah pisang terhadap kuat tekan beton pada umur 14 dan 28 hari. Abu pelepah pisang diperoleh melalui proses pembakaran pada suhu ±600°C, kemudian disaring hingga lolos saringan 0,075 mm. Variasi substitusi terhadap berat semen yang digunakan adalah 0%, 2,5%, 5%, 7,5%, dan 10%. Pengujian kuat tekan dilakukan pada benda uji silinder berukuran 150×300 mm sesuai SNI 1974:2011. Hasil penelitian menunjukkan bahwa penambahan abu pelepah pisang berpengaruh terhadap peningkatan kuat tekan beton. Nilai kuat tekan tertinggi diperoleh pada variasi 7,5% dengan kuat tekan sebesar 12,87 MPa pada umur 14 hari dan 15,02 MPa pada umur 28 hari, meningkat sebesar 17% dibanding beton normal. Namun, pada kadar 10% terjadi penurunan kuat tekan hingga 13,09 MPa. Hasil ini menunjukkan bahwa abu pelepah pisang dapat dimanfaatkan sebagai bahan substitusi semen hingga kadar optimum 7,5% tanpa menurunkan kekuatan beton. Penelitian ini mendukung konsep green building melalui pemanfaatan limbah biomassa lokal sebagai material ramah lingkungan.   Kata kunci: Abu pelepah pisang, substitusi semen, kuat tekan beton, beton ramah lingkungan, green building     Abstract   This study aims to analyze the effect of banana pseudostem ash substitution on the compressive strength of concrete at the ages of 14 and 28 days. The banana pseudostem ash was produced by burning the dried pseudostems at a temperature of approximately 600°C and sieving the resulting ash through a 0.075 mm sieve. The substitution levels of cement by weight were 0%, 2.5%, 5%, 7.5%, and 10%. Compressive strength tests were conducted on cylindrical specimens measuring 150×300 mm in accordance with SNI 1974:2011. The results show that the addition of banana pseudostem ash positively affects the compressive strength of concrete. The highest compressive strength was obtained at a 7.5% substitution level, with values of 12.87 MPa at 14 days and 15.02 MPa at 28 days, representing a 17% increase compared to normal concrete. However, at a 10% substitution level, the compressive strength decreased to 13.09 MPa. These findings indicate that banana pseudostem ash can be effectively utilized as a partial cement replacement up to an optimum level of 7.5% without reducing concrete strength. This research supports the green building concept through the utilization of local biomass waste as an environmentally friendly construction material.   Keywords: Pseudostem ash, cement substitution, compressive strength, eco-friendly concrete, green building
Analisis Terpadu Revitalisasi Pelabuhan Liem Hie Djung untuk Layanan Lintas Batas Indonesia-Malaysia Utomo, Edy; Bakri, Muhammad Djaya; Nawir, Daud; Arifin, Muhammad Asfihan Nur; Syarif, Iif Ahmad
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1341

Abstract

Abstrak   Pelabuhan Liem Hie Djung (Nunukan, Kalimantan Utara) merupakan simpul layanan lintas batas Indonesia-Malaysia, namun kinerja sisi air dan sisi darat masih dibatasi oleh kedalaman efektif, geometri perairan, dan kapasitas terminal. Penelitian ini menyusun dasar teknis revitalisasi melalui pemodelan bathimetri berbasis SIG dari raster BATNAS resolusi 10 m, survei lapangan, serta analisis kebutuhan fasilitas sisi air-sisi darat. Parameter arus dan pasut ditetapkan dari pengukuran dan analisis pasut setempat, sedangkan tinggi gelombang rencana diperoleh melalui peramalan gelombang. Hasil menunjukkan arus maksimum 0,59 m/s saat surut, tinggi gelombang rencana 0,46 m, serta muka air HWS +4,81 m, MSL +3,29 m, dan LWS +1,81 m. Untuk kapal rencana (LOA 29,50 m; sarat 1,22 m), kebutuhan minimum meliputi kedalaman rencana 2,27 m, lebar alur satu jalur 32,64 m, diameter kolam putar 44,25 m, dan panjang dermaga 81,00 m. Pada sisi darat diperlukan optimasi ruang tunggu, fasilitas pemeriksaan, serta area parkir 2.644 m2. Secara keseluruhan, pra-desain revitalisasi diusulkan bertahap dengan zonasi layanan regional dan internasional.   Kata kunci: Bathimetri, BATNAS, Dermaga, Revitalisasi, SIG.       Abstract   Liem Hie Djung Port (Nunukan, North Kalimantan) is a key border gateway for Indonesia-Malaysia maritime services, yet its waterside and landside performance is constrained by effective depth, basin geometry, and terminal capacity. This study develops a technical basis for revitalization by integrating GIS-based bathymetry modelling from 10 m BATNAS rasters, field surveys, and facility-needs analysis. Currents and tidal levels were derived from local measurements and tidal analysis, while the design wave height was estimated through wave forecasting. Results indicate a maximum current of 0.59 m/s during ebb, a design wave height of 0.46 m, and water levels of HWS +4.81 m, MSL +3.29 m, and LWS +1.81 m. For the design vessel (LOA 29.50 m; draft 1.22 m), the minimum requirements are a 2.27 m design depth, a 32.64 m single-lane channel width, a 44.25 m turning basin diameter, and an 81.00 m berth length. Landside improvements include reorganizing passenger flow, inspection facilities, and 2,644 m2 of parking. Overall, a phased, zoned revitalization is recommended to support border connectivity.   Keywords: Bathymetry, Border, GIS, Revitalization, Terminal
Analisis Forensik Kegagalan Atap Kayu akibat Perubahan Penutup Atap pada Balai Adat Dayak Kalimantan Utara Utomo, Edy; Hernadi, Ahmad
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1347

Abstract

Abstrak   Keruntuhan atap kayu pada bangunan publik merupakan peristiwa kritis yang menimbulkan risiko keselamatan dan menuntut evaluasi teknis yang akuntabel. Penelitian ini bertujuan menyajikan analisis forensik kegagalan atap kayu pada Balai Adat Dayak “X” di Kalimantan Utara yang terjadi segera setelah pemasangan penutup atap dan pelepasan penyangga sementara. Perubahan penutup atap dari seng (3,26 kg/m2) menjadi sirap kayu ulin (25 kg/m2) meningkatkan beban mati penutup atap sekitar 21,74 kg/m2 (0,213 kN/m2) atau 667% (7,7 x) dibanding kondisi awal, sehingga menaikkan tuntutan layanan elemen atap. Metode penelitian meliputi investigasi lapangan, pengujian laboratorium sifat material kayu, analisis manual gording sebagai elemen balok, serta pemodelan global rangka kuda-kuda menggunakan SAP2000 mengacu SNI 7973:2013. Evaluasi juga mempertimbangkan peran sambungan, pengaku lateral, dan perubahan kondisi pelaksanaan saat penyangga sementara dilepas. Hasil menunjukkan gording eksisting melampaui kriteria kekuatan lentur dan batas lendutan, sedangkan elemen kuda-kuda secara global masih aman terhadap gaya aksial. Temuan ini menegaskan bahwa kegagalan lokal elemen sekunder dapat memicu keruntuhan sistem atap secara keseluruhan. Studi ini memberikan dasar teknis bagi pengendalian perubahan spesifikasi material, pemeriksaan lendutan, dan pengaturan tahapan pelepasan penyangga pada konstruksi atap kayu.   Kata kunci: Atap, Forensik, Gording, Kayu, Keruntuhan     Abstract Public timber-roof collapses are critical events that pose safety risks and require accountable technical evaluation. This study aims to present a forensic analysis of a timber roof failure at the Dayak Traditional Hall “X” in North Kalimantan, which occurred shortly after roof covering installation and the removal of temporary supports. Replacing a metal sheet roof (3.26 kg/m2) with ironwood shingles (ulin) (25 kg/m2) increased the roof dead load by about 21.74 kg/m2 (0.213 kN/m2), equivalent to 667% (7.7 x) relative to the original condition, thereby increasing serviceability demands on roof components. The methodology includes field investigation, laboratory testing of timber material properties, manual analysis of purlins as local elements, and global modelling of the roof truss using SAP2000 in accordance with SNI 7973:2013. The evaluation also considers the role of connections, lateral bracing, and construction-stage changes when temporary supports were removed. Results indicate that the existing purlins exceeded bending strength and deflection limits, while the truss members remained globally safe in terms of axial forces. These findings confirm that local failure of secondary elements can trigger collapse of the specification changes, checking deflections, and managing the timing of temporary support removal in timber roof construction.   Keywords: Roof, Forensic, Purlin, Timber, Collapse

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