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Program Studi Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan Jl. Amal Lama No.1 Kota Tarakan Kalimantan Utara
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Civil Engineering Scientific Journal
Published by Universitas Borneo Tarakan
ISSN : 29623308     EISSN : 29631335     DOI : https://doi.org/10.35334/cesj.v1i2
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Mechanical Engineering
Civil Engineering Scientific Journal (CESJ) is a scientific journal published by the Civil Engineering Study Program, University of Borneo Tarakan. CESJ is a forum for civil engineering students to publish scientific works, research results, literature, and analytical studies that focus on the field of civil engineering. CESJ published three times a year (January, May, and September). The focus and scope of this journal are structural engineering, concrete & building material, transportation engineering, geotechnical engineering, water resources engineering & coastal engineering, construction engineering & management
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 5 Documents
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Search results for , issue "Vol 4, No 1 (2025): Civil Engineering Scientific Journal" : 5 Documents clear
ANALISIS KARAKTERISTIK SEDIMEN BERDASARKAN BUTIR SEDIMEN PADA KAWASAN SUNGAI SELOR ATAU SUNGAI BUAYA DI KABUPATEN BULUNGAN Singal, Rachel Zandra; Maharani, Larasati Nur
Civil Engineering Scientific Journal Vol 4, No 1 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i1.6307

Abstract

ABSTRACT: Based on field observations, Sungai Buaya/Sungai Selor has a problem, namely sediment piles where the sediment piles are overgrown with water hyacinth and other aquatic plants, thus inhibiting the flow of river water. As a result, the river does not function properly. The formulation of the problem in this study is how are the characteristics of sediment grains in the waters of Sungai Selor/Sungai Buaya. The purpose of the study was to determine the size of sediment grains, the shape of sediment grains and the specific gravity of sediment grains in the waters of Sungai Selor/Sungai Buaya. The method used in this study was to take samples in the field by random sampling at 6 points in the location of Sungai Selor/Sungai Buaya. Sediment characteristic analysis was conducted in the laboratory, namely testing the size of sediment grains using the sieve analysis method in accordance with the ASTM D 422 standard, determining the shape of sediment grains using a microscope and testing the specific gravity of sediment based on SNI 1964: 2008. The results of the analysis showed that the type of sediment in the Selor River/Buaya River consisted of coarse sand with a grain size of 0.850 mm and medium sand with a size between 0.250 mm - 0.425 mm. The shape of sediment grains that dominate the waters of the Selor River or Buaya River is sub-angular with high sphericity, angular with medium sphericity; sub-rounded with medium sphericity; rounded with high sphericity; rounded with low sphericity. The specific gravity test that has been carried out obtained the results of the specific gravity of sediment in the Selor River/Buaya River between 2.128 - 2.609.Keywords: Sediment Characteristics, Sediment Grain Size, Sediment Form, Sediment Specific Gravity, Selor River/Buaya River. ABSTRAK: Berdasarkan pengamatan di lapangan bahwa Sungai Buaya/Sungai Selor memiliki permasalahan yaitu tumpukan sedimen dimana tumpukan sedimen itu ditumbuhi enceng gondok dan tanaman air lainnya,  sehingga menghambat aliran air sungai. Akibatnya sungai tidak berfungsi dengan baik. Rumusan masalah pada penelitian ini adalah bagaimana karakteristik butir sedimen pada perairan  Sungai Selor/Sungai Buaya. Tujuan penelitian adalah untuk mengetahui ukuran butir sedimen, bentuk butir sedimen dan berat jenis butir sedimen di perairan Sungai Selor/Sungai Buaya. Metode yang digunakan pada penelitian ini adalah dengan pengambilan sampel di lapangan dengan cara random sempling pada di 6 titik di lokasi Sungai Selor/Sungai Buaya. Analisa karakteristik sedimen dilakukan di laboratorium yaitu pengujian ukuran butir sedimen dengan menggunakan dengan metode analisa saringan yang sesuai dengan standar ASTM D 422, penentuan bentuk butir sedimen dilakukan menggunakan mikroskop dan pengujian berat jenis sedimen dilakukan berdasarkan SNI 1964 : 2008. Hasil analisa didapatkan jenis  sedimen di Sungai Selor/Sungai Buaya terdiri dari pasir kasar dengan ukuran butir 0,850 mm dan pasir sedang dengan ukuran antara 0,250 mm – 0,425 mm. Bentuk butir sedimen yang mendominasi perairan Sungai Selor atau Sungai Buaya adalah berbentuk menyudut tanggung dengan kebulatan tinggi (sub-angular with high sphericity berbentuk menyudut dengan kebulatan sedang (angular with medium sphericity); berbentuk membundar tanggung dengan kebulatan sedang (sub-rounded with medium sphericity); berbentuk membundar dengan kebulatan tinggi (rounded with high sphericity); berbentuk membundar dengan kebulatan rendah (rounded with low sphericity). Uji berat jenis yang telah dilakukan mendapatkan hasil berat jenis sedimen di Sungai Selor/Sungai Buaya antara 2.128 – 2,609.Kata kunci: Karakteristik Sedimen, Ukuran Butir Sedimen, Bentuk Sedimen, Berat Jenis Sedimen, Sungai Selor/Sungai Buaya
SIMULASI HIDRAULIK ELEVASI MUKA AIR SALURAN RAWASARI MENGGUNAKAN HEC-RAS Amiruddin, Aswar; Widiyanti, Aneza Ferdani
Civil Engineering Scientific Journal Vol 4, No 1 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i1.4951

Abstract

The Rawasari Channel is one of the channels in the West Tarakan Subdistrict that supplies water for the availability of water in the city of Tarakan. However, the Rawasari Channel sometimes experiences overflow during high rainfall intensity. The purpose of this research is to determine the water level in the Rawasari Channel through hydraulic simulation using HEC-RAS software. The repeated flood discharge periods used as parameters for this research are 50 years and 100 years, calculated using the Rational method. The flood discharge analysis results using the Rational method for a 50-year recurrence period are 21,098 m3/s, and for a 100-year recurrence period, it is 21,399 m3/s. Based on the HEC-RAS simulation, there is no significant difference in water surface elevations due to the 50 and 100-year floods. From the HEC-RAS simulation, it is also known that due to the flood discharge of 50 and 100 years, overflow occurs in the Rawasari Channel at stations STA 350, 325, 300, 150, and 125. The water surface elevation due to the 50-year flood at STA 350 is 20.38 m, and for STA 300, the water surface elevation for the 50-year flood is 20.29 m. The elevation of the land surface around STA 350 and STA 300 ranges from 19.99 m to 20.19 m, so the height of the inundation due to the overflow of the Rawasari Channel is known to be between 11 cm and 30 cm.
EVALUASI KERUSAKAN JALAN MENGGUNAKAN METODE IRI, RCI, DAN PSI: STUDI KASUS JALAN P. AJI ISKANDAR KOTA TARAKAN Mansur, Achmad Zultan; Bagaskara, Johan Putra
Civil Engineering Scientific Journal Vol 4, No 1 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i1.6438

Abstract

ABSTRACT: This study aims to evaluate the road damage on Jalan P. Aji Iskandar in Tarakan City, a vital route for heavy vehicles, especially trucks transporting loads from the paper factory. The selection of this topic is important considering the high traffic volume and loads that exceed the road's capacity, which can lead to economic losses and safety issues for road users. The research methods used include the International Roughness Index (IRI), Present Serviceability Index (PSI), and Road Condition Index (RCI) to obtain comprehensive data regarding road conditions. The results indicate that the IRI values range from 3 to 10 m/km, with an average of 5 m/km, indicating that the road condition falls into the moderate to lightly damaged category. Additionally, the average PSI value of 1 indicates poor serviceability, while the average RCI value of 7 indicates good road conditions, although some segments require special attention. These findings emphasize the need for immediate repairs and regular maintenance to improve the quality of road infrastructure and user safety. This research is expected to contribute to developing better transportation policies in Tarakan City. Keywords: Road Damage, IRI, RCI, PSI ABSTRAK: Penelitian ini bertujuan untuk mengevaluasi kerusakan jalan di Jalan P. Aji Iskandar, Kota Tarakan, yang merupakan jalur vital bagi kendaraan berat, terutama truk pengangkut muatan dari pabrik kertas. Pemilihan topik ini penting mengingat tingginya volume lalu lintas dan beban yang melebihi kapasitas jalan, yang dapat menyebabkan kerugian ekonomi dan keselamatan pengguna jalan. Metode penelitian yang digunakan meliputi International Roughness Index (IRI), Present Serviceability Index (PSI), dan Road Condition Index (RCI) untuk mendapatkan data komprehensif mengenai kondisi jalan. Hasil penelitian menunjukkan bahwa nilai IRI bervariasi antara 3 hingga 10 m/km, dengan rata-rata 5 m/km, yang mengindikasikan kondisi jalan dalam kategori sedang hingga rusak ringan. Selain itu, nilai PSI rata-rata sebesar 1 menunjukkan kondisi pelayanan yang kurang baik, sementara RCI rata-rata sebesar 7 menunjukkan kondisi jalan yang baik, meskipun terdapat segmen-segmen yang memerlukan perhatian khusus. Temuan ini menegaskan perlunya perbaikan segera dan pemeliharaan rutin untuk meningkatkan kualitas infrastruktur jalan dan keselamatan pengguna. Penelitian ini diharapkan dapat memberikan kontribusi terhadap pengembangan kebijakan transportasi yang lebih baik di Kota Tarakan.Kata kunci: Kerusakan Jalan, IRI, RCI, PSI
PENGARUH PENAMBAHAN SUPERPLASTICIZER TERHADAP KUAT TEKAN BETON GEOPOLIMER Adhaini, Titis
Civil Engineering Scientific Journal Vol 4, No 1 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i1.6561

Abstract

ABSTRACT: Coal is extensively used as fuel by industries and steam power plants in Indonesia, generating pollutants such as fly ash during combustion. Fly ash contains active silica and alumina compounds, and one way to mitigate the environmental impact of fly ash is by using it as a partial substitute for cement in geopolymer concrete. This study aimed to determine the effect of adding superplasticizer additives strength of geopolymer concrete and to obtain the value of increasing the compressive strength of geopolymer concrete. The experimental method was employed, using a mixture of coarse and fine aggregate, fly ash, alkali activators (Na2SiO3 and NaOH), and superplasticizer additves. Cube specimens measuring 15x15x15 cm were conducted at 28 days of age. Based on the study results, the percentage variations of superplasticizer (BG 0%, BG 0,5% BG 1%, and BG 1,5%) on geopolymer concrete showed no significant effect on the test specimens across the dependent variables. However, after being given superplasticizer additives, an increase of 1,17% was obtained between BG 0% and BG 0,5% and 0,38% between BG 1% and B 1,5%.Keywords: Alkali Activator, Geopolymer Concrete, Fly Ash, Superplasticizer, Compressive Strength              ABSTRAK: Batubara sebagai bahan bakar banyak digunakan oleh Industri dan Pembangkit Listrik Tenaga Uap di Indonesia dari pembakaran tersebut menghasilkan polutan berupa abu terbang atau fly ash. Abu terbang (fly ash) mengandung senyawa silika dan alumina aktif, salah satu usaha untuk mengurangi hasil limbah pembakaran tersebut yaitu dimanfaatkan sebagai pengganti semen pada beton geopolimer. Tujuan penelitian ini adalah untuk mengetahui pengaruh penambahan zat aditif superplasticizer terhadap beton geopolimer dan untuk mendapatkan nilai peningkatan kuat tekan beton geopolimer. Metode yang digunakan dalam penelitian ini adalah metode eksperimental dengan bahan campuran utama agregat kasar dan halus, fly ash, alkali aktivator yaitu Na2SiO3 dan NaOH, dan juga zat aditif superplasticizer. Benda uji menggunakan kubus berukuran 15x15x15 cm dengan sampel sebanyak 10 buah  untuk masing-masing variasi yang selanjutnya dilakukan pengujian kuat tekan pada saat umur beton 28 hari. Berdasarkan hasil dari penelitian dengan presentase variasi superplasticizer BG 0%, BG 0,5%, BG 1% dan BG 1,5% terhadap beton geopolimer yaitu pada benda uji tidak terdapat adanya pengaruh yang signifikan dengan masing-masing variabel terikat. Namun, setelah diberi zat aditif superplasticizer didapatkan peningkatan sebesar 1,17% antara BG 0% dan BG 0,5% serta 0,38% antara BG 1% dan BG 1,5%.Kata kunci: Alkali Aktivator, Beton Geopolimer, Fly Ash, Superplasticizer, Kuat Tekan
PENGARUH FLY ASH TERHADAP KUAT TEKAN BETON DENGAN TAMBAHAN SP 0.5% Natalia, Natalia
Civil Engineering Scientific Journal Vol 4, No 1 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i1.6563

Abstract

ABSTRACT: One of the materials most often used for building structural components is concrete. To produce quality concrete, you need to improve the quality of the constituent materials, such as the fineness of the cement and the hardness of the aggregate. Concrete can be made of higher quality by adding additional chemicals such as superplasticizers and fly ash, some of which can replace cement. The main objective of this research is to compare concrete mixtures and determine the compressive strength of concrete that has been added with superplasticizer, as well as to obtain the optimum fly ash content value for the compressive strength of concrete added with superplasticizer of 0.5% with fly ash substitution until it reaches a maximum value of 15%. . The maximum compressive strength of concrete containing a 15% fly ash mixture at 28 days is 388.57 kg/cm2. Based on this research, concrete with a 15% fly ash mixture has a maximum compressive strength of 372.43 kg/cm2, compared to normal 0% concrete of 388.57 kg/cm2, while for a 5% fly ash mixture it is 369.08 kg/cm2, and 371.37 kg/cm2 for 10% fly ash mixed concrete.Keywords: Concrete, Fly ash, Superplasticizer, Compressive Strength, Variations  ABSTRAK: Salah satu material yang paling sering digunakan untuk komponen struktur bangunan adalah beton. Untuk menghasilkan beton yang berkualitas adalah dengan meningkatkan kualitas bahan penyusunnya, seperti kehalusan semen dan kekerasan agregat. Beton dapat dibuat dengan kualitas lebih tinggi dengan menambahkan bahan kimia tambahan seperti superplasticizer dan fly ash yang sebagian dapat menggantikan semen. Tujuan utama penelitian ini adalah untuk membandingkan campuran beton dan mengetahui kuat tekan beton yang telah diberi bahan tambah superplasticizer, serta memperoleh nilai kadar fly ash optimum terhadap kuat tekan beton berbahan tambah superplasticizer sebesar 0,5% dengan subtitusi fly ash sampai mencapai nilai maksimum 15%. Kuat tekan maksimum beton yang mengandung campuran fly ash 15% pada umur 28 hari adalah 388,57 kg/cm2. Berdasarkan penelitian ini, beton dengan campuran fly ash 15% mempunyai kuat tekan maksimum sebesar 372,43 kg/cm2, dibandingkan beton normal 0% sebesar 388,57 kg/cm2, sedangkan untuk campuran fly ash 5% sebesar 369,08 kg/cm2, dan 371,37 kg/cm2 untuk Beton campuran fly ash 10%.Kata kunci: Fly ash, Superplasticizer, Kuat Tekan Beton

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