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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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Volume Requirement Analysis of Beam Structure Work Alfianarrochmah, Ilma; Fikri, Muhammad Nazhif Irsyal
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.v9i2.10710

Abstract

Beams serve as the main structural elements that transmit loads from floor slabs to columns and ensure the overall stability of the building. Calculation of beam volume requirements is essential to determine the amount of materials required, such as concrete and reinforcing steel. The conventional method of calculating the volume of a beam structure involves the use of basic mathematical formulas to calculate the dimensions and volume of materials required. This method is often used in the learning process of civil engineering to teach basic concepts of volume calculation. The method of implementing beam structure work affects the technical aspects. Therefore, it is necessary to conduct research related to the calculation of beam structure requirements in the Joglo Elementary School building construction project. The purpose of this research is to analyze the needs of bracing, formwork, and concreting on floors 1, 2, and 3 of the Joglo Elementary School Building Project. This type of research is quantitative research. The calculation uses conventional methods (mathematical formulas). The data collection method used is the field observation method and data processing is assisted using Microsoft Excel 2021 software. The need for beam formwork for the 1st floor is 12,492.12 kg, the 2nd floor is 28,222.35 kg, and the 3rd floor is 28,222.35 kg. The formwork requirements for the 1st floor beams amounted to 627.220 m2, the 2nd floor amounted to 873.91 m2, and the 3rd floor amounted to 873.91 m2. The need for concreting the 1st floor beam or tiebeam is 68,424 m3, the 2nd floor is 97,084 m3, and the 3rd floor is 97,084 m3.
Evaluation of Signalized Intersection Performance Using Vissim Microsimulation and PKJI 2023 (Case Study: Gunung Sari Intersection In Cirebon City) Hariani, Mira Lestira; Pradana, Ikhlas Maddinah; Wihardi, Rendy Yogista; Yudiansyah, Yunandhika Agung; Radical, Romeo Yullezia; Al Baihaqi, Fais Hidayah
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.v9i2.11031

Abstract

The development of urban traffic in the city of Cirebon poses challenges to the performance of signalized intersections, particularly at the Gunung Sari intersection, which connects four main corridors: Jl. Cipto Mangunkusumo, Jl. Wahidin, Jl. Tuparev, and Jl. Kartini. This study aims to evaluate the existing performance of the intersection using a manual approach based on the 2023 Indonesian Road Capacity Guidelines (PKJI) and microscopic modeling with PTV VISSIM software. The survey was conducted by recording traffic volume for 5 days between 06:00 and 18:00 WIB, with peak conditions occurring on Saturday between 13:00 and 14:00 WIB at 8,082 vehicles/hour. The traffic composition was dominated by motorcycles (59.54%) and passenger cars (39.03%). The results of the 2023 PKJI analysis showed that all intersection arms in the existing condition were at service level F with an average delay of 92.24–98.24 seconds and a queue length of 76.63–204.84 meters. The 10-year projection shows an increase in the degree of saturation to >1.80 with the highest delay on the Kartini arm of 436.33 seconds. Validation of the VISSIM model using the GEH test produced a value of <5 with a conformity level above 95%, so the model is reliable. The simulation results show that Scenario 1 (simplifying the cycle to 3 phases by combining Wahidin and Cipto) is the most effective alternative because it can reduce the average delay and queue length evenly compared to other scenarios. This study emphasizes the importance of periodic evaluation and the application of simulation-based scenarios in supporting urban traffic management.
The Effect of Adding Wire Mesh on the Compressive Strength of Concrete Using Peat Water and Sea Water Faisal, M.Hanif; Kamil, Firmanilah; Purnomo, Julyan
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v10i1.10884

Abstract

Concrete is a widely used construction material due to its strength and durability, but its quality is greatly influenced by its constituent materials and the environment. In West Kalimantan, people use scrap wire from building demolition as an additive in concrete, while clean water is limited, so peat water or seawater is often used as a mixer. This study aims to determine the effect of wire mesh usage and mixing water type on concrete compressive strength at 7, 14, and 28 days. Test specimens in the form of cubes were made with variations: normal concrete (clean water), concrete with peat water, concrete with seawater, and concrete with 1% wire mesh added to each type of water, and compressive strength testing was conducted using a compression testing machine. The results showed that peat-water concrete achieved the highest strength (119.50, 207.37, and 247.73 kg/cm² at 7, 14, and 28 days), seawater concrete produced the lowest (92.87, 182.27, and 225.90 kg/cm²), and the addition of 1% wire mesh increased early-age strength up to 186.57 kg/cm² at 7 days but its effect diminished at later ages. Thus, the type of mixing water plays a dominant role in concrete quality, while steel tie wire  is more effective in increasing strength during the early stages of hardening.
Identifying The Functions of Serang City Square as a Public Green Space Shinta Permana Putri; Raddina Nur Fattima
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Serang City, as the capital of Banten Province, has met the urban green open space standards, achieving a percentage of 59.64%. Serang City Square is one of the representations of public green open spaces in the area. This study aims to identify the extent to which Serang City Square fulfills its ecological, socio-cultural, aesthetic, and economic functions as a public green open space. This study is based on the direct perceptions of visitors and addresses a research gap, as perception-based evaluations of public green open spaces remain limited, particularly in the context of Serang City Square. This research is a quantitative descriptive study. Data were collected through a questionnaire survey and field observations. The questionnaire survey was conducted with 100 visitors of Serang City Square. Field observations were also carried out to complement the questionnaire data. The data were then analyzed using descriptive statistical and qualitative descriptive analysis techniques. The results indicate that Serang City Square has fulfilled most of its ecological and economic functions; however, some aspects of its social and aesthetic functions remain suboptimal. This is shown by the absence of children’s play areas, public perception of poor cleanliness and sanitation, and insufficient lighting that affects comfort and environmental aesthetics. These findings indicate the need for intervention by the Serang City Government to strengthen the functionality of Serang City Square as a public green open space.
Strength Improvement of Soft Clay Stabilised With Rice Husk Ash and RCC-15 Spent Catalyst Based on Unconfined Compressive Strength Performance (UCS) Gaol, Esron Padiri Lumban; Syahril, Syahril; Akbardin, Juang
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v10i1.11284

Abstract

This study evaluates the effect of combining 12% rice husk ash (RHA) with varying percentages of RCC-15 spent catalyst (7%, 9%, 11%, and 13%) on the engineering properties of soft clay soil obtained from Cililin. Laboratory tests were conducted, including physical property characterization, compaction tests, and unconfined compressive strength (UCS) tests with curing periods of 0, 3, 7, and 14 days. The results show that the addition of RHA and RCC-15 improves soil compaction characteristics, indicated by an increase in maximum dry density and a reduction in optimum moisture content. Furthermore, the UCS values increased significantly with higher RCC-15 content and longer curing periods, reaching values between approximately 1.57 and 3.66 kg/cm² at 14 days. These improvements are attributed to mechanical densification and pozzolanic reactions between the stabilizing agents and soil minerals. This study emphasizes the synergistic application of agricultural and industrial waste materials for local soil stabilization, indicating that the combined use of rice husk ash and RCC-15 spent catalyst can enhance the engineering performance of soft clay while supporting sustainable and resource-efficient ground improvement practices.
Spatial Statistic Modeling for Rice Field Area Prediction Year 2026 to 2030 in Polewali Mandar Regency Mulawarman, Ade; Utami A, Widyanti; Priadmodjo, Anggit; Munaja, Rahmiyatal; Erwin, Muh. Alfarezi; Al-faridzi, Muh. Reza
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v10i1.11646

Abstract

The sustainability of rice fields is fundamental to maintaining regional food security, particularly in agricultural production centers such as Polewali Mandar Regency, West Sulawesi, Indonesia. Rapid population growth and spatial development have intensified pressure on productive agricultural land, increasing the risk of long-term decline in rice field availability. This study develops a spatial statistical modeling framework to predict the distribution of rice field conversion for the period 2026–2030 using an integration of Frequency Ratio (FR) and Spatial Multi-Criteria Analysis (SMCA) within a Geographic Information System (GIS) environment. Land cover data from 2010 and 2020 were used to identify historical conversion patterns and to construct predictive variables. Ten driving factors—including topography, slope, geomorphology, soil type, rainfall, accessibility, settlement characteristics, and spatial policy direction—were evaluated alongside protected agricultural zones as limiting constraints. Model validation using the Receiver Operating Characteristic (ROC) curve produced an AUC of 0.83 (success rate) and 0.75 (predictive rate), indicating good and reliable model performance. The projection results demonstrate continued pressure on rice field areas, particularly in zones influenced by infrastructure and settlement expansion. By providing spatially explicit predictions, this study offers a decision-support tool for proactive land-use regulation, agricultural protection policies, and strategic planning interventions aimed at safeguarding food self-sufficiency in the medium term.
GIS-Based Evaluation of The Integrated Waste Management Site in Sidodadi Village Al-Faridzi, Muh. Reza; Mulawarman, Ade; Priadmodjo, Anggit; Mukhlis, Jafar; Saputra, Ade Guna
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v10i1.11650

Abstract

This study evaluates the effectiveness of the Integrated Waste Management Facility (TPST) service in Sidodadi Sub-district, Wonomulyo District, Polewali Mandar Regency, using a spatial analysis approach based on the location–allocation method implemented in ArcGIS. The research is motivated by the high population density of Sidodadi, which has led to an increase in waste generation, while only a single TPST facility is currently operational. A quantitative descriptive method was applied, utilizing primary data from field observations and secondary spatial data, including building point data, road network data, and high-resolution satellite imagery. Spatial analysis was conducted by mapping waste generation at the building level, performing network-based distance analysis along the road network (as opposed to straight-line/Euclidean distance), and modeling TPST service coverage using a location– allocation model. The model parameters included a service distance cutoff of ≤ 1 km and facility capacity constraints based on the maximum number of households that can be served within a given facility. The results indicate that the existing TPST can serve approximately 600 households, corresponding to only about 15,84 % of the total residential buildings in Sidodadi Sub-district. Consequently, a significant proportion of densely populated residential areas remains outside the effective service coverage. This limited coverage is primarily influenced by insufficient facility capacity and service distances exceeding the defined cutoff. The study recommends the development of additional TPST facilities at strategically selected locations to increase service coverage percentage and enhance the efficiency and sustainability of waste management in Sidodadi Sub-district.
Identification of Traffic-Induced Soil–Structure Resonance in Heritage Buildings and Mitigation using Operational Modal Analysis Khoeri, Heri; Sofiana, Dini
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v10i1.11702

Abstract

Excessive vibrations in heritage buildings located near heavy traffic often cause occupant discomfort despite adequate structural capacity. This study investigates the vibration mechanism and proposes a mitigation strategy with minimal intervention using Operational Modal Analysis (OMA) and Stochastic Subspace Identification (SSI). The identified fundamental frequency of the building is 3.09 Hz, which closely matches the dominant traffic-induced ground frequency (3.10 Hz), yielding a frequency ratio  ≈ 1.0 and confirming soil–structure resonance as the governing mechanism. This resonance amplifies responses, particularly at intermediate floors. To mitigate the effect, a Multiple Tuned Mass Damper (MTMD) system with a total mass of 4 tons (≈0.54% of structural mass) is proposed. The MTMD effectively reduces dynamic amplification while remaining non-invasive, making it suitable for heritage structures. The results demonstrate that small-mass MTMD provides a practical and efficient vibration mitigation solution.
Seismic Performance Evaluation using Pushover Analysis of Four Two-Storey Residential Building Types in West Bandung Regency Sugianto, Joesack Renaldi; Pranata, Yosafat Aji
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v10i1.11748

Abstract

In seismic-actively located West Bandung Regency it is crucial for evaluation of existing residential buildings seismic performance to mitigate potential earthquake losses. The purpose of this study was to study four standard two-storey reinforced concrete residential houses type A–D in West Bandung Regency using nonlinear static pushover analysis in SAP2000 and two main directions (X and Y). Performance points were established using the FEMA 440 equivalent linearization approach by crossing the capacity spectrum with the seismic demand spectrum, including stiffness degradation and effective damping due to nonlinear response. The seismic performance was analyzed in terms of some of the most common response indicators (spectral acceleration, spectral displacement, effective period or ductility, effective damping) and an empirical FEMA 356 plastic hinge assessment to establish the dominant mechanism of the damage. This shows a high directional dependency between spectral demand and displacement capacity among building types. The distribution of hinge states at the performance point is characterized by early–to-moderate damage types (A–B, B–IO, and IO–LS), with more severe states (LS–CP, CP–C, and isolated C–D) present in certain situations and localized. In conclusion the nonlinearity of the response is best characterized by a beam dominant mechanism indicating ductile behavior, however localized advanced hinge states indicate the requirement for targeted strengthening at critical members and directions.
Anodizing Characteristics of AA1100 in 20% Sulfuric–Phosphoric Acid Electrolytes under Aerated and Non-Aerated Conditions at Various Times Tri Hariyadi; Tita Rosita; Aniqa Arjumand Bano Harvani; Silvia Fatimatur Rahmawati; Tifa Paramitha; Adhitasari, Alfiana; Sihombing, Rony
Journal of Green Science and Technology Vol 10 No 1 (2026): Journal of Green Science and Technology Vol. 10 No.1 March 2026
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v10i1.11796

Abstract

Aluminum alloy AA1100 exhibits good corrosion resistance but suffers from low surface hardness and wear resistance, which can be improved through anodizing. However, limited studies have examined the combined influence of sulfuric–phosphoric acid electrolyte composition and aeration. This study investigates the effect of sulfuric–phosphoric acid electrolyte composition and aeration on oxide layer mass, thickness, and hardness during anodizing. Anodization was conducted using a total electrolyte concentration of 20% with varying sulfuric acid (15–20%) and phosphoric acid (5–0%) ratios at a current density of 3 A/dm², operating times of 15 and 30 minutes, and room temperature under aerated and non-aerated conditions. The results show that aeration significantly increased oxide layer formation, yielding an average oxide mass of 0.0173 g compared to 0.0106 g in non-aerated systems. The maximum oxide mass (0.0375 g) was obtained at 20% sulfuric acid with aeration for 30 minutes. The highest oxide layer thickness of 47.94 µm was achieved using a 19% sulfuric acid–1% phosphoric acid electrolyte under aerated conditions at 30 minutes. Meanwhile, the maximum surface hardness of 352.60 HVN was obtained at 15% sulfuric acid–5% phosphoric acid with aeration for 15 minutes. These findings demonstrate that electrolyte composition and aeration play a critical role in optimizing anodic oxide growth and mechanical properties of AA1100.

Page 13 of 14 | Total Record : 132

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