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Journal of Green Science and Technology
Published by Universitas Swadaya Gunung Jati
ISSN : 25981277     EISSN : 26213966     DOI : https://doi.org/10.33603/jgst.v9i1
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Transportation
Journal of Green Science and Technology (JGST) published since 2017 by Faculty of Engineering Universitas Swadaya Gunung Jati Cirebon, Indonesia with p-ISSN 2598-1277 and e-ISSN 2621-3966. JGST publishes twice a year in March and September. Publications before 2023 can be seen here. Journal of Green Science and Technology (JGST) has been accredited by National Journal Accreditation (ARJUNA) Managed by Ministry of Research, Technology, and Higher Education, Republic Indonesia since year 2022 to 2022 according to the decree No. 230/E/KPT/2022. Journal of Green Science and Technology (JGST) accepts and publishes multidisciplinary research and critical review of issues that contains of all scientific works related to the field of following Sciences Engineering: - Civil Engineering - Architectural Engineering - Environmental Engineering - Chemical Engineering - Mechanical Engineering - Electrical Engineering - Industrial Engineering - Informatics Engineering, etc. All manuscripts must be written in English.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 132 Documents
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Performance Evaluation of The Apparatus at The Intersection of Jl. Teuku Umar-Jl. Pemuda and Jl. Sawunggaling - Jl. Basuki Rahmat Bojonegoro District Soegyarto; Yulis Widhiastuti; Andy Yanuar Putra Riyadi
Journal of Green Science and Technology Vol 9 No 1 (2025): Journal of Green Science and Technology Vol. 9 No. 1 March 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i1.9946

Abstract

Along with the increasing progress and development in society, the desire to use time and money is very necessary. Population growth in an urban area is always followed by an increase in space requirements. In Bojonegoro itself, which is one of the cities of industry, tourism, and education that cannot be separated from the movement of traffic in and out of both people and goods. So there are many intersections that connect roads to shopping centers, offices, government, housing, and roads to the city center. One of the intersections in Bojonegoro is the intersection of Jl. Teuku Umar-Jl. Pemuda and Jl. Sawunggaling-Jl. Basuki Rahmat Bojonegoro Regency which has a fairly high transportation density during working time hours, so the use of traffic signals is needed. This causes the traffic flow that passes through to continue to experience changes in vehicle volume, especially at certain hours which causes delays in travel due to increased traffic flow. In order to avoid travel delays due to increased traffic flow, improvements in traffic management are needed. This study aims to analyze and evaluate the performance of the intersection of Jl. Teuku Umar-Jl. Pemuda and Jl. Sawunggaling-Jl. Basuki Rahmat Bojonegoro Regency using the PKJI 2023 method. From the results of the analysis, it is found that there is a need for an additional phase from 2 phases to 4 phases so that there is no queue length and the number of vehicles stopped on the East Approach (Jl. Pemuda) is too long and many. Keyword: intersections, traffic, transportation, traffic signals.
Comparison of Concrete Performance With Fiberglass Substitution as A Sand Replacement yuliswidhiastuti; Soegyarto; Andy Yanuar Putra Riyadi
Journal of Green Science and Technology Vol 9 No 1 (2025): Journal of Green Science and Technology Vol. 9 No. 1 March 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i1.9947

Abstract

Fiberglass, with its superior mechanical properties and corrosion resistance, has been proposed as a partial or total replacement for sand in concrete mixes. Although research on the use of glass powder as a sand substitute has been widely conducted, specific studies examining the use of fiberglass as a fine aggregate replacement in concrete are limited. Therefore, this study will focus on a comparative analysis of the performance of concrete with fiberglass substitution as a sand replacement material, considering various mechanical and durability aspects. With the aim of knowing the effect of the addition of fiberglass powder into the concrete mixture. in this study the method of calculating mix design using the SNI 03-2834-2000 method. in this research, the results obtained with the addition of fiberglass in the concrete mixture at certain variations cannot increase the compressive strength of Hybrid concrete at the age of 7 days, 14 days and 28 days.   The optimum value of the 7-day concrete compressive strength test is in the 2% variation of fiberglass addition, which is 12.14 MPa because it does not decrease significantly. The optimum value of the 14-day concrete compressive strength test is also in the 2% variation of 15.01 MPa, and for the optimum value of the 28-day concrete compressive strength test is also in the 2% variation of 18.38 MPa.  Keyword: Concrete, Fiberglass, Compressive Strength.
The Needs and Availability Analysis of Clean Water in The Mebidang Spam Services in Medan Marelan Region Muhammad, Faathir; Malau, Flaura Dearnita; Gultom, Natalia Cindy Octavia; Lubis, Putri Nabila; Arisetyo, Rama; Mulyana, Rachmat; Wardana, Novrizaldi
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10375

Abstract

Analysis of clean water needs and availability in Medan Marelan District is needed to ensure the adequacy of SPAM services along with population growth and increasing domestic and non-domestic water consumption in the future. This study aims to identify the projection of clean water needs and availability that can be accessed by the community in Medan Marelan District over the next 10, 30, and 50 years. The analysis was conducted using a quantitative descriptive approach, utilizing secondary data sourced from relevant agencies and applying arithmetic projection methods to estimate population growth, as well as the increase in both domestic and non-domestic water demands. The calculation results show that the need for clean water in the area will increase significantly from 2024 to 2075, with a total need reaching 680.27 liters per second in 2075. However, the availability of clean water from the Mebidang Regional Drinking Water Supply System (SPAM), with a capacity of 1,100 liters per second, is estimated to still be able to meet these needs during the observed period. This surplus condition provides a strong basis for policy planning and sustainable water resource management in Medan Marelan District.
Improving Shear Strength Of Expansive Soil Through Asphalt Emulsion And Local Pozzolanic Additives Oktofani, Khansa Nuansa; Syahril, Syahril; Indra Noer Hamdhan; Naess, Victor Firstkiel Feber
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10408

Abstract

Expansive clayshale soils pose a significant geotechnical challenge due to their high swell-shrink potential and low shear strength, necessitating urgent development of effective and sustainable stabilization methods. This study explores the stabilization of such problematic soils using a combination of emulsified asphalt (AE) and Bledug Kuwu mud (LBK), a natural pozzolanic byproduct derived from a unique geological phenomenon in Central Java, Indonesia. A total of 51 cylindrical specimens were prepared with a fixed 8% AE content and varying LBK contents (6%, 10%, 14%, and 18%) by dry weight of soil. The mechanical properties were evaluated using Unconsolidated Undrained (UU) triaxial tests, while Scanning Electron Microscopy (SEM) was employed to examine microstructural evolution. The results highlight a marked improvement in shear strength parameters cohesion (c) and internal friction angle (φ)—in tandem with increased LBK content and curing duration. The optimal mixture (18% LBK, 8% AE, and 14 days of curing) showed a significant rise in c from 79.46 kPa to 150.88 kPa and φ from 14.3° to 24.0°, indicating a synergistic interaction between the asphalt binder and pozzolanic compounds. SEM analysis confirmed the formation of a denser and more cohesive matrix, attributed to both the physical encapsulation effect of AE and the pozzolanic reaction products, particularly calcium silicate hydrate (C–S–H) and calcium aluminate hydrate (C–A–H), which enhanced interparticle bonding. These findings underscore the effectiveness and urgency of adopting AE–LBK stabilization as a cost-efficient and environmentally friendly alternative for improving expansive soils. The study provides a foundational basis for field-scale implementation and long-term performance assessment in infrastructure development on marginal ground.
Analysis of Success Factors: Self-Management System Using The AHP Method At The Ji’rona Building Project ‘Aisyiyah Hospital Bojonegoro Rohmat Satriawan, Earlangga; Putra, Nyoman Dita Pahang; Velantika, Griselda Junianda
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10451

Abstract

Construction projects require an effective and efficient project management system to achieve the expected development goals. One of the developments in project management is the production of a self-managed project management system, which is a management system that the project owner manages by prioritizing the use of their resources. This study aims to determine the priority scale of the factors and criteria for success in self-management in the Ji’rona Building Construction Project of RSAB. The data collection technique used a quantitative descriptive questionnaire survey in this study. The study involved 24 respondents, including project owners, planning teams, implementation teams, supervisory teams/CM, and self-management expert respondents. The data analysis method uses the AHP (Analytical Hierarchy Process) method to make it easier to make decisions based on several alternative self-management success factors. Based on the results of data analysis, the research identified the results of ranking criteria and sub-criteria in the form of a diagram, as well as changes in the hierarchical structure of the research on the success factors of self-management success. The study concluded that the priority factors for the success of self-management in the Ji’rona RSAB Building Construction Project were quality 0.124, communication 0.120, risk management 0.116, stakeholder satisfaction 0.111, cost 0.110, administration 0.108, resources 0.107, time 0.101, and characteristics of the place 0.089.
Evaluation of The Effectiveness of Modular Infiltration Boxes in Reducing Surface Runoff in Urban Areas: A Case Study In Cirebon City, Indonesia Tribhuwana, Awliya; Wahyudi, Slamet Imam; Ni’am, Moh. Faiqun Ni’am
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10588

Abstract

The urban area of Cirebon City, Indonesia, with its tropical climate, in the Sunyaragi sub-district, is increasingly affected by surface runoff and flooding due to limited drainage capacity and extensive impervious surfaces. This study evaluates the effectiveness of a modular infiltration box system in reducing urban stormwater runoff. Hydrological data from Harjamukti, Kamun, and Kertajati stations from 2014 to 2023 were analyzed using a Log Pearson Type III distribution to determine rainfall intensity for return periods of 2, 5, and 10 years. Field Experiment and Laboratory Analysis Methods: Soil infiltration characteristics were tested using a double ring infiltrometer and modeled with the Horton infiltration equation. Infiltration boxes measuring 1.00×0.50×0.45m were installed on the road median in two configurations, single layer (22 units) and double layer (44 units). The results showed that the single-layer system reduced runoff by 43.06% for a 5-year return period (15-minute duration), while the double-layer system achieved a reduction of up to 86.60% for a 2-year return period (20-minute duration). Further improvements were observed when combined with infiltration wells, achieving runoff reductions of over 95%. These findings demonstrate that modular infiltration boxes are an effective and scalable alternative solution for decentralized urban stormwater management, contributing to flood mitigation and sustainable drainage planning.
Road Surface Analysis Using the International Roughness Index and Pavement Condition Index (Case Study: Gajah Mada Street, Tegal City) Marwanto, Riza Phahlevi; Maheswara, Andhika Adiwidya; Bahrelsi, Damar Risky; Perdana, Brezinka Ayu; Fitria, Ina; Hadi, Suprapto
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10624

Abstract

Road surface quality plays an important role in ensuring safety and comfort for users Gajah Mada Street in Tegal City was chosen as the study site because it functions as a main route with heavy traffic flow, and there are various physical damages on its surface. This study aimed to evaluate the condition of the road by applying the International Roughness Index (IRI) and Pavement Condition Index (PCI) approaches. Data collection was conducted through field surveys using a Hawkeye vehicle for IRI and a visual PCI inspection based on ASTM D6433-11 standards. The analysis results showed an average PCI value of 77, categorized as very good, while the IRI value was 6.23 m/km, indicating a fair condition. The difference between the two methods highlights the importance of a multi-method approach in road condition assessment. This study recommends regular and periodic road maintenance to sustain optimal road performance.
Evaluation of Temporary Evacuation Shelter (Tes) For Tsunami In Banggae Timur, Majene Based on Location-Allocation Analysis Erwin, Muh. Alfarezi; Priadmodjo, Anggit; Munaja, Rahmiyatal; Mulawarman, Ade; Mukhlis, Jafar; Wahyudi, Adip
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10638

Abstract

Majene Regency, specifically the Banggae Timur District, is at considerable risk of tsunamis due to its coastal location and increasing urban density. This research evaluates the effectiveness of current Temporary Evacuation Shelters (TES) using a spatial analysis methodology combined with location-allocation modeling. The methodology included tsunami inundation mapping utilizing historical data, identification of building points, analysis of TES capacity, and modeling of service areas within a maximum evacuation radius of 935 meters.The study concentrated on two specific TES: Prasamya Stadium and the Majene Regency Police Station. Although both locations possess adequate capacity for hosting evacuees, they are situated within high-risk tsunami inundation zones (5–6 meters), making them inappropriate for safe evacuation. Spatial allocation modeling indicates that these TES predominantly serve the western section of Banggae Timur District, resulting in considerable underservicing of eastern coastal areas and increased risk. Of the 2,774 houses located within the tsunami inundation zone, 1,506 are currently unserved by the existing TES. The findings highlight the necessity of identifying and establishing new TES in safer, elevated areas with enhanced accessibility to improve evacuation coverage and safety. This study emphasizes the importance of spatial modeling in enhancing evidence-based disaster mitigation planning. It offers precise, data-driven insights for optimizing emergency infrastructure and minimizing population risk exposure in urban areas susceptible to tsunamis.
Analysis of Traffic Accident-Prone Locations (Case Study: Kaliurang Road, Sleman Regency) Halim, Muhammad Farid Halim; Sugianto, Sugianto; Hardimansyah, Rizki
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10640

Abstract

Traffic accidents are one of the leading causes of high mortality rates in Indonesia. During the period 2022–2024, Kaliurang Road in Sleman Regency was identified as one of the road segments with a high accident rate, with a total of 359 incidents resulting in 24 fatalities and 451 minor injuries. This study aims to identify accident-prone locations along the Kaliurang Road segment. The methods used include the Equivalent Accident Number (EAN) to weight accident severity levels, as well as the Upper Control Limit (UCL) and Upper Control Boundary (BKA) methods to determine accident-prone locations. The analysis of traffic accident characteristics shows that most incidents occurred in the morning (06:00–12:00), with male drivers being the most frequent offenders and motorcycles being the most commonly involved vehicle type. The most dominant collision type was a crash between the front and side parts of vehicles. Four accident-prone segments were identified: kilometers 7–8, 8–9, 12–13, and 13–14. Recommendations for addressing these accident-prone locations include the installation of rumble strips, rearrangement of community activity spaces or roadside obstruction control, improvement of street lighting, enhancement of road markings and warning signs, and the provision and installation of appropriate traffic signs. This study provides recommendations by identifying accident-prone locations along Kaliurang Road and offering suggestions based on accident characteristics and road conditions to improve traffic safety for road users.
Phosphoric Acid-Activated Carbon From Coffee Grounds and Fly Ash For Efficient Laundry Wastewater Adsorption Muhari, Emma Hermawati Muhari; Silalahi, Rafael Leonardo; Puspita, Nina; Maryani, Anisya Sri; Sihombing, Rony Pasonang; Adhitasari, Alfiana; Kurnia, Dianty Rosirda Dewi
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10649

Abstract

Laundry waste that is directly discharged into water bodies causes pollution due to its chemical content, such as phosphate. The adsorption method is chosen as an option to reduce the phosphate content in laundry waste due to its simple preparation and low cost. The adsorbent used is a mixture of coffee grounds and fly ash. The use of coffee grounds is based on the increasing waste from coffee shops, thus being utilized as an adsorbent. The aim of this study is to determine the effectiveness of coffee grounds and fly ash with the best combination of composition and contact time using the adsorption method. The stages begin with the preparation of coffee grounds and fly ash through carbonization and activation using H3PO4. The variations performed consisted of variations in the composition of coffee grounds and fly ash with a total of 1 gram in ratios of 1:4; 2:3; 1:1; 3:2; 4:1 and contact time variations of 15 minutes, 30 minutes, 45 minutes, 60 minutes, and 75 minutes. Based on the research results, the highest percentage of removal was found in the composition variation of coffee grounds and fly ash with a ratio of 1:4 for 75 minutes.

Page 12 of 14 | Total Record : 132

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