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INDONESIA
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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Analysis of The Stability of The Temporary Tunnel Support Structure in The Excavation Phase of The Cipanas Dam Tunnel Rezeki, Ingrid Multi; prasetyo, singgihangga
Journal of Green Science and Technology Vol 8 No 2 (2024): Journal of Green Science and Technology Vol.8 No.2 September 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i2.9438

Abstract

Dams are generally equipped with bypass tunnels. The circumvention tunnel functions to maintain the safety of the dam and can reduce excessive water pressure around the dam. This can help prevent collapse or damage to the dam structure due to excess pressure. The objectives of this research are to determine the implementation of making temporary support structures in tunnels, to obtain the maximum stress values that occur in temporary tunnel support structures, to obtain deformation values that occur in tunnels and safety factors related to the use of steel H Beam as reinforcement, to find out the results of stability analysis. tunnel temporary support structure. Method for analyzing soil stability during the installation of steel supports during the implementation of bypass channel work using the 2D plaxis program approach. The main stress in the Cipanas dam tunnel is tensile stress. The maximum tensile stress occurs at the top of the tunnel due to gravity and groundwater loads. Axial deformation in the Cipanas dam tunnel is deformation that occurs in the direction of the tunnel axis. Maximum axial deformation occurs at the top of the tunnel due to gravity and groundwater loads. Data from stress analysis and deformation analysis at Sta. 0+180.76 total stress -1.56*103kN/m2 relative shear stresses 0.99 deformed mesh 34.84*10-9 m scealead up 100.00*106 total displacement 34.86*10-9 E-mst 1.00, Sta. 0+280.76 total stress -2.82*103kN/m2 relative shear stresses 0.72 deformed mesh 613.16*10-6 m scealead up 10.00*103 total displacement 613.16*10-6 E-mst 1.00, Sta. 0+480.76 total stress -1.61*103kN/m2 relative shear stresses 1.00 deformed mesh 2.19*106 m scealead up 2.00*10-6 total displacement 2.19*106 E-mst 1.938 Keyword: Main Dam, Avoidance Tunnel, Stability.
Material Testing for The Development of Environmentally Friendly Concrete With Conventional Aggregate Substitutes Kamil, Firmanilah; Purnomo, Julyan
Journal of Green Science and Technology Vol 8 No 2 (2024): Journal of Green Science and Technology Vol.8 No.2 September 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i2.9577

Abstract

In Ketapang District, there is potential to reduce the environmental impact of concrete production by utilizing local agricultural waste. This study aims to determine the comparison between the physical properties of coconut fiber and palm kernel shells as aggregate substitutes in concrete, with the physical properties of conventional aggregates such as sand and crushed stone. Coconut coir came from tourism waste in Ketapang Regency, while palm kernel shells were taken from the waste of the local palm oil processing industry. Laboratory tests were conducted to compare the physical properties of coconut fiber and palm kernel shell with conventional aggregates, namely sand and crushed stone. The test results showed significant differences. Coconut husk had a specific gravity of 1.19 and palm kernel shell 1.59, compared to sand 2.09 and crushed stone 2.81. The moisture content of palm kernel shell (17.40%) was much higher than that of crushed stone (1.15%), while the water absorption of palm kernel shell reached 37.16%, far above the water absorption of crushed stone (4.05%). Coconut husk and palm kernel shell have lower specific gravity than conventional aggregates, making them ideal for lightweight concrete. However, the high water absorption of palm kernel shells requires adjustments to the concrete mix design. This study shows that the use of local waste materials can contribute to the development of environmentally friendly concrete, but careful composition control is required to maintain concrete performance. Keyword: aggregate, concrete, material testing.
Analysis of Cipelang River Strorage Capacity Regency Sumedang tribhuwana, awliya; Farhan, Ohan
Journal of Green Science and Technology Vol 8 No 2 (2024): Journal of Green Science and Technology Vol.8 No.2 September 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i2.9578

Abstract

Rainy season flooding: Ujung Jaya Regency experiences flooding almost every year, this annual flood phenomenon causes material losses. The research aims to analyze the capacity of the Cipelang River which is located in Sumedang Regency. The Cipelang River is part of the Cimanuk Watershed (DAS) with an area of ​​around 130.70 km², which has several tributaries such as Ciandana, Cicacaban, and Cipanassaat. The methods used in this research include collecting hydrological data, topographic analysis, and evaluating land use around the river. Rainfall and river flow data were taken from the nearest meteorological station to determine water storage potential. Results of analysis of existing river storage capacity and flood discharge. The maximum capacity of the Cipelang river is 409,002 m3/s. Nakayasu HSS method planned discharge using river watershed discharge occurs in the 100 year anniversary period. However, time periods of 2,5,10,25,50 years are considered safe. The results of comparing the planned discharge of the Hasper method with the discharge of the river catchment did not occur. So the most suitable method to use is the hasper method, land use which is dominated by irrigated rice fields and gardens also contributes to water management in this watershed. It is hoped that this research can provide recommendations for better water resource management and flood risk mitigation in the area. These findings are important to support sustainable infrastructure development and maintain ecosystem balance in the Sumedang Regency area.  Keywords: Rain , River, Discharge, Capacity, Flood
Gaps And Needs of Education Facilities in Majene Regency mukhlis, Jafar; Lestari, Sri Apriani Puji; Asriana, Zul; Munaja, Rahmiyatal; Hariani, Mira Lestira
Journal of Green Science and Technology Vol 8 No 2 (2024): Journal of Green Science and Technology Vol.8 No.2 September 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i2.9581

Abstract

Majene Regency is located in West Sulawesi Province and is designated as a provincial education area causing the population to increase, the increase in population is not accompanied by an increase in the number of educational facilities which causes a lack of access to education. This study aims to determine and analyze the gap in educational facilities in Majene Regency and analyze the needs of ideal educational facilities in Majene Regency. This research is descriptive quantitative research, namely research that describes variables as they are supported by data in the form of numbers generated from actual circumstances. The result of this research is that most districts have educational facilities such as kindergarten, elementary school, junior high school, and high school. Only Banggae district and Tubu Sendana district and Ulumanda district do not have high school facilities. The education distribution gap occurs in Majene Regency, Majene Urban Area is most dominant in lacking educational facilities compared to other districts. This is not correlated with the status of the urban center which in fact provides and has more facilities and services than other districts. Efforts are needed to improve and develop educational facilities by adding educational facilities, especially high school education facilities, which have the highest demand. Keyword: facilities, distribution, needs, education.
Utilization of Power Plant and Agricultural Waste as A Cement Substitute on The Compressive Strength of Environmentally Friendly Concrete purnomo, julyan; kamil, firmanilah
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.v9i1.9619

Abstract

This study aims to assess the effect of using Fly Ash and Rice Husk Ash as cement substitutes in the manufacture of environmentally friendly concrete. Fly Ash, a waste from coal-fired power plants, and Rice Husk Ash, an agricultural waste, were used as partial cement substitutes in four concrete mix variations, viz: normal concrete without substitution (N), concrete with 20% Fly Ash (K), concrete with a combination of 10% Fly Ash and 10% Rice Husk Ash (L), and concrete with 20% Rice Husk Ash (M). The compressive strength test was conducted at the age of 7 days, 14 days, and 28 days. The results showed that concrete with 20% Fly Ash (K) produced the most optimal compressive strength, especially at longer concrete ages. Concrete with Rice Husk Ash substitution (M) and a combination of Fly Ash and Rice Husk Ash (L) showed lower compressive strength than normal concrete (N) and Fly Ash alone. Therefore, the use of Fly Ash at 20% gave the best compressive strength results among the variations tested. Keyword: Cement Substitution, Compressive Strength, Eco-friendly concrete, Fly Ash, Rice Husk Ash
Replanning of The Wedi Irrigation Network System, Kapas District, Bojonegoro District Mushthofa, Mushthofa; Indriani, Yulia; Riyadi, Andy Yanuar Putra
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.v9i1.9638

Abstract

Kapas District is located in Bojonegoro Regency with an area of ​​2,927 ha of rice fields and 2,805 ha of irrigation land. The obstacle faced by farmers is the uneven availability of irrigation water. The irrigation area in Wedi Village is still simple irrigation by pumping river water next to it. This research aims to plan the irrigation network in Wedi, by calculating irrigation water needs and planning the dimensions of the irrigation channels. The algebraic method is used to calculate rainfall and calculate water needs using the Net Field Requirements (NFR) system. Water requirements at the beginning of planting in November I obtained a maximum value of 1.79 lt/s/ha, the alternative for beginning of planting in December I obtained a maximum value of 1.90 lt/s/ha, and the alternative for beginning of planting in December II obtained a value of 1.88 lt/s/ha. Results of overall water balance analysis for each month in 1 year with 3 alternative plantings with surplus results. The channel dimensions obtained are SP 1 = 1.4 m x 1 m, SP 2 = 1.4 m x 1 m, SP 3 = 1.2 m x 1 m, SP 4 = 1.2 m x 1 m, and for secondary channels the results are SS 1 = 0.6 m x 1 m , SS 2 = 0.8 m x 1 m, SS 3 = 0.6 m x 1 m , SS 4 = 0.6 m x 1 m = , SS 5 = 0.6 m x 1 m.  Keyword: Network Planning, Plant_water_requirements, NFR, channel dimensions.
Planning Modification of Steel Arch Bridge on Cimanuk Bridge Tomo District Sumedang Regency Cirebon-Bandung Highway Roesdiana, Tira; Kholiah, Mif’fetin
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.v9i1.9923

Abstract

One of the businesses that supports transportation is the construction of Bridge infrastructure. In improving and supporting transportation facilities, the condition of the bridge must be in good condition. The Cimanuk Bridge which originally used the Steel Box Girder & Steel I Girder structure with a pillar in the middle of the span, the structure will be modified into An Arch Steel Bridge without pillars. Cimanuk Bridge is ± 100 m long, including a long-span bridge so that it can use An Arch Steel Bridge Structure. [1] SNI 1726:2019 about Seismic analysis for design It uses the equivalent static. Analysis method based on SNI 1729: 2020 about Specification for structural steel building. And SNI 1725:2016 about Loading for bridges. The methode of structural analysis performed using SAP2000 version 22 software. The structural calculation process includes the determination of the structural system, load analysis, structural modeling, internal force analysis, reinforcement calculation, and examination of structural element requirements. The result show main structure profile using Double WF 700x550x40x45, Longitudinal Girder WF 500x200x10x16, Transverse Girder WF 1200x500x20x28, Tie Beam BOX 1000x1000x50, Wind Bracing using Square/Box. Keyword: Arch Steel Bridge; Cimanuk Bridge; Steel Structure; SNI 1729:2019; SNI 1725:2016
A Literature Study: Behavioral Observation of the Combination of Rigid and Flexible Pavements: - Rizky, Ajeng Meiliana; Sihombing, Atmy Verani Rouly; Sugiyanto, Martinus Agus
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.v9i1.9927

Abstract

The use of longitudinally laid composite pavement is currently massively used in Indonesia as part of the 272 national road standard program. This study systematically reviews and discusses the essential characteristics of semi-rigid flexible pavement widely implemented in Indonesia by comparing the bonding conditions between concrete overlays on flexible pavement; asphalt overlays on rigid pavement; longitudinal joints between flexible-flexible pavements, rigid-rigid pavements, rigid (roadway) pavements, and flexible (shoulder) pavements; and finds the potential similarity in characteristics for longitudinal joints between rigid (shoulder) pavements and flexible (roadway) pavements. The results reveal that the stiffness of the material significantly affects the remaining service life. Furthermore, high temperatures and water immersion cause stiffness of asphalt specimens loss, potentially leading to rutting and raveling. This indicates that damages due to water and temperature significantly affect the roadway, which is a structure formed with homogeneity.  Keyword: semi-rigid flexural pavement, interface conditions, stiffness modulus, residual life prediction.  
The Effect of Aggregate Gradation Variation on Mechanical Performance and Porosity of Porous Geopolymer Concrete Saputro, Yayan Adi; Qomaruddin, Mochammad; Budianta, Tarsisius Dwi Wibawa
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.v9i1.9940

Abstract

Porous geopolymer concrete has gained attention as a sustainable and environmentally friendly alternative to conventional Portland cement-based concrete, utilizing industrial waste such as fly ash. This study investigates the effect of aggregate gradation variations on the mechanical properties, porosity, and sustainability of fly ash-based porous geopolymer concrete. The experimental method was employed, utilizing fly ash as the primary binder, sodium hydroxide (NaOH) as the activator, and coarse aggregates of varying sizes (3/8", 1/2", and 3/4"). The concrete samples were tested for compressive strength and porosity at 7, 14, and 28 days following ASTM standards. The results indicate that aggregate gradation significantly influences the mechanical properties, porosity, and sustainability of geopolymer concrete. Smaller aggregate sizes (3/8") produced higher compressive strength (5.42 MPa at 28 days) but lower porosity, while larger aggregates (3/4") increased porosity but reduced compressive strength. Additionally, the study confirms that geopolymer concrete using fly ash as a binder meets the standard requirements for setting time, specific gravity, and durability. These findings contribute to optimizing porous geopolymer concrete for sustainable construction applications, particularly in drainage and permeable pavement systems, promoting waste utilization and environmental sustainability.  Keyword: Porous geopolymer concrete, fly ash, , porosity, waste, sustainability
Utilization of HDPE Plastic Waste for Asphalt Making Additives With A Combination of Glass Waste Filler Alfia Nur Rahmawati; Amalia Ma’rifatul Maghfiroh
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.v9i1.9943

Abstract

Asphalt is one of the materials used as a road pavement material, this material was chosen because of its good and comfortable final result as a flexible pavement. The use of HDPE plastic waste as an additive to asphalt material and glass waste as filler was chosen in making asphalt, because it is an effort to overcome the problem of waste and besides that the content contained in these materials is thought to be an alternative to making asphalt. The purpose of this study was conducted to determine the characteristics of the constituent materials of asphalt mixture with HDPE plastic additives and glass waste filler; Marshall characteristics of asphalt mixture with HDPE plastic additives and glass waste filler; and the optimum composition ratio to produce asphalt with HDPE plastic additives and glass waste filler. The research results of the effect of the addition of plastic (HDPE and glass powder, partial replacement of asphalt and partial replacement of filler with a mixture proportion of 10-15 mm Coarse Aggregate fraction with a composition of 10%, Medium Aggregate 5-10 mm 48%, Fine Aggregate 0-5 mm 38%%% included in the gradation envelope requirements for AC-BC concrete asphalt layers, the Optimum Asphalt Content (KAO) value in the most optimum AC-BC hot asphalt mixture of 7.30%. While the variation of HDPE addition 6%, 4% and glass powder 1%, 2%, 3% is most optimal at the addition rate of 2.5% and 0.5%. The determination is based on the Marshall test by combining the values of VIM, VMA, VFA, Stability, Flow and Marshall Quotient (MQ). Keyword: Asphalt, Additives, HDPE, Filler, KAO.

Page 11 of 14 | Total Record : 132

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