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Composite Journal
Published by Universitas Negeri Gorontalo
ISSN : -     EISSN : 28075919     DOI : https://doi.org/10.37905/cj.v1i1.7
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
The journal aims to become an efficient means of publishing and distributing high-quality information from researchers, scientists, and engineers. The main scopes are as follows: Advances in Composite Materials, Computational Mechanics, Foundation and Retaining Walls, Slope Stability, Soil Dynamics, Soil-Structure Interaction, Pavement Technology, Tunnels and Anchors, Site Investigation and Rehabilitation, Ecology and Land Development, Water Resources Planning, Environmental Management, Earthquake and Tsunami Issues, Safety and Reliability, Geo-Hazard Mitigation, Case History and Practical Experience, Others
Arjuna Subject : Teknik (semua kategori) - Bangunan dan Konstruksi
Articles 60 Documents
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EVALUASI KINERJA RUAS JALAN JENDERAL SUDIRMAN KOTA GORONTALO AKIBAT PARKING ON THE STREET Dhea Nur Amanah Hadjarati; Frice Lahmudin Desei; Yuliyanti Kadir
Composite Journal Vol. 6 No. 1 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i1.148

Abstract

Jalan Jenderal Sudirman adalah salah satu ruas jalan di Kota Gorontalo yang memiliki volume kendaraan yang besar. Keadaan ini diperparah oleh banyaknya kendaraan yang parkir di sepanjang badan jalan. Tujuan dari penelitian ini untuk mengetahui kinerja dari ruas Jalan Jendral Sudirman akibat adanya parkir di badan jalan. Dalam penelitian ini MKJI 1997 digunakan sebagai pedoman dalam menganalisis kinerja ruas jalan. Penelitian ini dilangsungkan selama 3 hari yaitu hari Selasa, 11 Juni 2024, Jumat, 14 Juni 2024, dan Sabtu, 15 Juni 2024. Hasil kondisi eksisting yang didapatkan yaitu tingkat pelayanan jalan terburuk terdapat pada hari Selasa, 11 Juni 2024 dengan nilai derajat kejenuhan sebesar 0,58 dan masuk pada kategori tingkat pelayanan jalan C, serta pada kondisi jika tidak terdapat parkir di badan jalan tingkat pelayanan meningkat menjadi 0,30 dan masuk pada kategori B. Hasil ini menunjukan bahwa kegiatan parkir di badan jalan sangat berpengaruh pada optimalnya kinerja ruas jalan.
ANALISIS KUALITAS AIR TANAH DANGKAL DAN KEBUTUHAN AIR PADA KAWASAN PESISIR LEATO UTARA Irana I. Koem Ibrahim Ismail; Aryati Alitu; Marike Mahmud
Composite Journal Vol. 6 No. 1 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i1.171

Abstract

Leato Utara, located in Gorontalo City, Gorontalo Province, is a coastal area known as a tourist destination and residential centre. The increasing population in this area has led to a growing demand for clean water. As a result, most residents rely on shallow aimed to analyse the quality of groundwater in Leato Utara and asses the community’s water demand. The analysis method involved testing physical parameters (TDS, turbidity, temperature, colour, odour, and salinity), chemical parameters (iron, pH, manganese, and hardness), and microbiological parameters (Escherichia coli and Coliform) based on the Ministry of Health Regulation No. 2 of 2023. Water demand was analysed based on population data, including domestik and non-domestik water needs, water losses, and total water demand. The results indicated that shallow groundwater quality in Leato Utara varies across physical, chemical, and microbiological parameters, Physical parameters such as turbidity, temperature, colour, and salinity met the quality standards 100%, but only 33.33% of TDS samples met the standard. Chemical parameters such as pH, manganese, and iron fully met the standards, while only 33.33% of hardness results were within acceptable limits. Microbiological tests revealed that 66.67% of samples exceeded the standard for Coliform and 33.33% for E. Coli, indicating potential bacterial contamination. Water availability was found to be 28.512 liters/day, which is insufficient compared to the community’s total demand of 34.008 liters/day. Therefore, appropriate measures are needed to address this water supply issue.
EVALUASI NILAI KERUSAKAN JALAN PADA RUAS MOLINGKAPOTO SIMPANG KWANDANG MENGGUNAKAN SURFACE DISTRESS INDEX (SDI) DAN INTERNATIONAL ROUGHNESS INDEX (IRI) Moh. Reza Jahja; Frice Lahmudin Desei; Yuliyanti Kadir
Composite Journal Vol. 6 No. 1 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i1.173

Abstract

Road damage is a complex problem and can cause major losses for road users.The purpose of this study is to analyze the damage to the Molingkapoto road at the Kwandang intersection, and to examine the appropriate handling of the damage that occurs. The methods used in the study are the SDI and IRI methods. The SDI method is a visual assessment of damage conditions. In calculating the SDI value, 4 elements are used, namely % crack area, crack gap width, number of holes/100 m and depth of wheel ruts. The IRI method is the value of road surface flatness calculated from the cumulative number of ups and downs of the longitudinal profile surface divided by the distance/length of the measured surface. The IRI value in this study was taken per 100 m using the Roadlab Pro application. The results of the SDI method analysis showed good conditions of 82%, moderate 12%, minor damage 3%, and severe damage 3%. The road conditions were dominated by good conditions along 2.7 km. The results of the IRI method analysis showed very good conditions of 0%, good conditions of 68%, moderate 29%, bad 3%, and very bad 0%. The road conditions were dominated by good conditions along 4.5 km. The combination of SDI and IRI values showed that Molingkapoto road at the Kwandang intersection sta. 6+300 to sta. 9+600 was in moderate condition and only required routine maintenance.
PENGGUNAAN AGREGAT HALUS PASIR GUNUNG DUMATO SEBAGAI PENGGANTI PASIR SUNGAI UNTUK BATA BETON RINGAN CELLULAR LIGHTWEIGHT CONCRETE (CLC) Arif Supriyatno
Composite Journal Vol. 6 No. 1 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i1.199

Abstract

Beton ringan Celuler Lightweight Concrete (CLC) adalah bahan konstruksi beton mortar aerasi dengan bobot ringan dan bisa diaplikasikan untuk berbagai konstruksi seperti dinding, lantai, timbunan jalan dan lainnya. Bahan pembuatan beton ringan CLC adalah semen dan pasir sebagai agregat halus. Penelitian ini bertujuan untuk mengetahui penggunaan pasir Dumato yang dihaluskan dan digunakan sebagai agregat halus pada beton ringan CLC. Pasir Dumato adalah material pasir gunung yang sering diambil sebagai material timbunan pada Quary disekitar Kota Gorontalo. Penelitian ini merupakan pengujian eksperimen untuk mengetahui pasir gunung Dumato sebagai pengganti pasir sungai. SNI 8640 2018 memberikan persyaratan kelas berat dan kelas mutu. Hasil pengujian menunjukkan pasir Dumato masuk zone 1. Pasir Dumato diproses dengan dihaluskan dan dicuci sehingga menghasilkan pasir halus dan lolos saringan No 50 dengan kadar lumpur berkurang hingga 0%. Perencanaan campuran 1 semen: 2 pasir dumato dan foam, dihasilkan berat volume sebesar 800 kg/m3 dan kuat tekan 3,23 Mpa. Berdasarkan SNI 8640:2018 maka masuk dikelas Mutu Bataringan non struktural kelas IIA
STUDI PERFORMA MEKANIK AWAL BETON GEOPOLIMER BERBASIS FLY ASH TIPE C DI BAWAH PAPARAN SULFAT Hazen Masrafat; Almutahir
Composite Journal Vol. 6 No. 1 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i1.200

Abstract

This study examines the early-age sulfate resistance of Class C fly ash–based geopolymer concrete (GPC) in comparison with Portland cement concrete (PCC). The research evaluates mechanical performance, mass stability, and microstructural responses after 28 days of exposure to a 5% magnesium sulfate solution. The experimental program includes material characterization, dry-mix geopolymer preparation, sulfate immersion testing, and mechanical assessments. Chemical analysis shows that the fly ash contains 65% total pozzolanic oxides and 69.68% amorphous content, confirming its high reactivity and suitability for geopolymerization. The results indicate that GPC exhibits significantly better sulfate resistance, with a minimal mass change of only +0.03%, compared with PCC, which shows a +0.72% increase due to higher sulfate penetration. Mechanically, GPC demonstrates notable improvements: compressive strength increases by 25%, and elastic modulus rises by 9–11% after exposure. In contrast, PCC experiences only a slight increase in strength, primarily attributed to temporary pore filling from gypsum and ettringite formation rather than genuine structural enhancement. Microstructural observations confirm the presence of sulfate reaction products on both materials; however, no cracking or structural damage is detected, and GPC maintains a more stable aluminosilicate network. These findings highlight GPC’s superior early-age durability and its potential as a sustainable and chemically robust alternative to PCC in sulfate-rich environments. The study provides new experimental insights into the short-term sulfate behavior of Class C fly ash–based GPC and recommends future long-term durability evaluations under extended exposure durations and field-representative conditions.
ANALISIS EFEKTIVITAS GROUTING TIRAI (CURTAIN GROUTING) DALAM MENGURANGI REMBESAN PADA SANDARAN KIRI BENDUNGAN BULANGO ULU Muhammad Rizki Ismail; Indriati Martha Patuti; Komang Arya Utama
Composite Journal Vol. 6 No. 2 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i2.205

Abstract

Rembesan yang terjadi pada fondasi bendungan diakibatkan oleh kondisi struktur geologi batuan yang buruk pada dasar bendungan, sehingga perlu dilakukan perbaikan grouting tirai untuk melakukan pengendalian laju rembesan dengan nilai lugeon < 3. Bendungan Bulango Ulu merupakan bendungan multifungsi yang dibangun untuk mendukung penyediaan air, irigasi, dan pengendalian banjir di Provinsi Gorontalo. Untuk menjamin keamanan dan kinerja bendungan, diperlukan pengendalian rembesan melalui grouting tirai, untuk tercapainya pelaksanaan grouting tirai secara maksimal dan efektif perlu dilakukan trial grouting guna menentukan jarak efektif antar lubang grouting serta analisis efektivitas grouting tirai untuk menilai keberhasilannya dalam mengurangi rembesan pada Bendungan Bulango Ulu. Metode yang digunakan meliputi analisis statistik dengan pendekatan split-spacing dan persamaan Cedergren, H.R. (1967), analisis menggunakan data sekunder berupa data geologi dan nilai lugeon hasil grouting tirai. Berdasarkan hasil peninjauan bahwa batuan fondasi tersusun atas diorit bone dan granodiorit dengan tingkat pelapukan ringan hingga berat serta nilai rembesan awal berkisar antara 10,13-41,41 Lu. Hasil jarak efektif antar lubang grouting sebesar 1,5 m terbukti dari nilai efektivitas dengan nilai efektivitas 85,9% (kategori baik) dan grout take 24,19 kg/m (kategori rendah). Analisis statistik menunjukkan penurunan nilai lugeon yang signifikan dari lubang pilot hingga lubang cek. Hasil dari analisis efektivitas grouting menggunakan persamaan Cedergren sebesar 89,59% (kategori baik). Berdasarkan analisis efektivitas grouting pelaksanaan grouting tirai pada Tumpuan Kiri Bendungan Bulango Ulu terbukti efektif dalam mengurangi rembesan pada dasar bendungan.
PENGARUH DRIVING CYCLE TERHADAP EMISI KENDARAAN MENGGUNAKAN PROGRAM MOVES PADA RUAS JALAN NUSANTARA KOTA MAKASSAR Siti Nurfajrina J Patunrangi; Muhammad Ikbal; Mhd. Alfikar Marpaung; Nurul; Sri Hardianti Samad
Composite Journal Vol. 6 No. 2 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i2.208

Abstract

Kemacetan lalu lintas perkotaan di kota berkembang menghasilkan pola berkendara yang kompleks dan berpengaruh kuat terhadap emisi kendaraan. Penelitian ini bertujuan menganalisis driving cycle lokal serta dampaknya terhadap emisi kendaraan ringan di Jl. Nusantara, Makassar, sebagai representasi koridor jalan nasional perkotaan. Fokus penelitian adalah mengkuantifikasi hubungan antara perilaku kecepatan dan pembentukan polutan menggunakan karakteristik berkendara lokal.Metode penelitian mengombinasikan pengumpulan data kecepatan detik-per-detik untuk membangun driving cycle lokal dengan estimasi emisi berbasis Motor Vehicle Emission Simulator (MOVES). Dinamika lalu lintas diklasifikasikan menjadi creeping, acceleration, deceleration, dan cruising, kemudian dianalisis kontribusinya terhadap emisi. Analisis regresi digunakan untuk menilai hubungan antara kecepatan rata-rata dan intensitas emisi (g/km). Hasil menunjukkan creeping mendominasi hingga 60,96 % dengan pola stop-and-go yang kuat. Karbon monoksida CO menjadi polutan dominan dengan nilai maksimum 9,829 g/km, sedangkan HC <0,127 g/km dan NOx 0,047–0,230 g/km. Emisi menurun seiring peningkatan kecepatan pada rentang 5–35 km/jam dengan R² >0,8. Penelitian ini menegaskan pentingnya integrasi driving cycle lokal dalam pengendalian emisi perkotaan.
ANALISIS KAPASITAS DUKUNG TIANG PANCANG DENGAN VARIASI DIAMETER METODE MEYERHOF DAN REESE & WRIGHT BERDASARKAN DATA STANDARD PENETRATION TEST Saphira Rofilah Mokoginta; Indriati Martha Patuti; Fadly Achmad
Composite Journal Vol. 6 No. 2 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i2.227

Abstract

Fondasi tiang pancang digunakan untuk meneruskan beban struktur ke lapisan tanah yang memiliki daya dukung memadai. Pada tanah endapan danau, variasi diameter tiang menjadi salah satu faktor yang mempengaruhi kapasitas dukung fondasi. Penelitian ini bertujuan menganalisis pengaruh variasi diameter terhadap kapasitas dukung tiang pancang serta membandingkan hasil metode Meyerhof dan Reese & Wright berdasarkan data Standard Penetration Test (SPT).Analisis dilakukan pada tiang pancang beton tunggal dengan diameter 0,5 m dan 0,6 m menggunakan data SPT yang telah dikoreksi. Perhitungan meliputi tahanan ujung, tahanan gesek selimut, kapasitas dukung ultimit, dan kapasitas dukung izin pada berbagai kedalaman.Hasil penelitian menunjukkan bahwa peningkatan diameter tiang meningkatkan kapasitas dukung pada kedua metode. Pada kedalaman optimum 24 m, kapasitas dukung izin metode Meyerhof meningkat dari 472,34 kN menjadi 760,50 kN atau sebesar 61,0%, sedangkan metode Reese & Wright meningkat dari 826,52 kN menjadi 1.053,73 kN atau sebesar 27,5%. Kedalaman 24 m merupakan kedalaman yang paling efektif karena telah mencapai lapisan tanah dengan nilai SPT yang lebih tinggi. Hasil penelitian menunjukkan bahwa diameter tiang dan kondisi lapisan tanah berpengaruh signifikan terhadap kapasitas dukung fondasi. Temuan ini dapat menjadi acuan dalam penentuan dimensi dan kedalaman fondasi tiang pancang yang efisien pada tanah endapan danau.
PENGEMBANGAN INDEKS KEPATUHAN KUALITAS AIR UNTUK EVALUASI KINERJA INSTALASI PENGOLAHAN AIR DI KABUPATEN GORONTALO Aristi Ayuningsi Ode Asri; Dwianto
Composite Journal Vol. 6 No. 2 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i2.233

Abstract

The performance of Water Treatment Plants (WTPs) is generally evaluated by assessing compliance with individual quality standards, without producing an integrated performance metric. As part of a Compliance-Based Evaluation Framework, this study developed the Water Quality Compliance Index (WQCI / Indeks Kepatuhan Kualitas Air, IKKA) to evaluate the performance of six WTPs in Gorontalo Regency: Pulubala, Tilango, Pilohayanga, Bulota, Tabongo, and Biyonga. Primary data consisting of laboratory test results for 11 physicals (5 parameters), chemical (4 parameters), and microbiological (2 parameters) quality parameters were compared against the standards set out in Minister of Health Regulation No. 2 of 2023. The WQCI for each WTP was calculated as an unweighted ratio of the number of parameters meeting quality standards to the total of 11 parameters evaluated, while aspect-level indices were calculated per parameter category across all six WTPs. Results showed that the chemical aspect achieved full compliance (100%; 24/24 evaluations), the physical aspect reached 83.3% (25/30), and the microbiological aspect was the weakest at 16.7% (2/12). Total coliform exceeded standards at all six WTPs, E. coli exceeded standards at four, and turbidity failed at five of six WTPs. WQCI values ranged from 72.7% to 90.9%, classified into three performance categories: "Satisfactory" (72.7%; Tilango, Pilohayanga, Bulota, Tabongo), "Good" (81.8%; Pulubala), and "Very Good" (90.9%; Biyonga), with a system-wide average WQCI of 77.3% ("Satisfactory"). The critical parameters identified were turbidity and coliform bacterial contamination. Technical recommendations therefore focused on optimizing filtration, strengthening disinfection, and controlling contamination in the distribution network.
ANALISIS PENURUNAN DAN DEFLEKSI PONDASI BORED PILE PADA WILAYAH KOTA TIMUR GORONTALO Dwianto; Aristi Ayuningsi Ode Asri
Composite Journal Vol. 6 No. 2 (2026): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v6i2.234

Abstract

The foundation is a critical structural element that must safely transfer axial and lateral loads from a building to the supporting soil. Due to the variable bearing capacity of sandy soils across East City District, Gorontalo, general design correlations are often unreliable, making site-specific verification necessary. This study analyzes the axial settlement and lateral deflection of bored pile foundations for a Bank Indonesia branch office construction project in East City, Gorontalo, by comparing analytical methods (Poulos and Davis for settlement, Broms for lateral deflection), Plaxis 2D numerical modeling, and field loading tests. Results show the pile's axial bearing capacity reached 1,025.15 kN, producing a maximum settlement of 3.04 mm. Under a design load variation of 850 kN, settlement values were 2.5 mm (Poulos and Davis), 1.92 mm (Plaxis), and 2.03 mm (field test), with an average difference of 16.89%, indicating good agreement between analytical and field results for axial behavior in sandy soil. For lateral behavior, the maximum allowable lateral load was 114.99 kN, exceeding McNulty's required criterion, so no batter piles were needed. Lateral deflection analysis produced 5.49 mm under a 50 kN design load, compared to only 1.4 mm from the field lateral loading test, an average difference of 77%, both remaining below McNulty's 6 mm allowable limit. The much larger discrepancy in lateral deflection indicates that the conventional Broms method is considerably more conservative than actual field behavior. Overall, the bored pile foundation performed well within allowable limits, and the percentage differences obtained may serve as correction factors for future pile foundation designs in similar sandy soil conditions in Gorontalo, particularly where field test data are limited.

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