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Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia
Published by Universitas Tribhuwana Tunggadewi
ISSN : 25033654     EISSN : 25032682     DOI : -
Core Subject : Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Environmental Science Industrial & Manufacturing Engineering
Focus and Scope of this journal are : Chemical Engineering including : bioenergy processing, environmental engineering, natural resource management, Heat and Mass Transfer, Chemical Reaction, Analytical Chemistry, Biochemistry, Designing tools and chemical processes, Chemical industry process, Computing and modeling (simulation) process, Particle and nano technology, membrane technology, esessential oil technology, and phytopharmaca, etc. Civil Engineering including : technology of construction materials, transportation system, environmental layout, concrete and wood structures, steel construction, bridge and dam construction, management of water resources and Hydrology, earthquake engineering, sanitation systems and urban drainage.
Arjuna Subject : -
Articles 182 Documents
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Clean Water Initiative for Village Businesses (BUMDes) Development Betek Village, Krucil District, Probolinggo Regency, East Java Pragusta, Reska; Girinada, Rizki Ganda
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 2 (2024): EDISI SEPTEMBER 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i2.5779

Abstract

The Betek area, Krucil District, Probolinggo Regency is at the foot of Mount Argopuro with deep groundwater conditions, so water in the ground is difficult to obtain. Currently, the need for clean water in Betek Village relies on spring sources around the area with a network simply built by the community. Unstable water source discharge is felt to be insufficient to meet community needs, especially during the dry season. So a study of underground water was carried out by approaching the electromagnetic field in the study area. One of the earth electromagnetic methods used is the magnetotelleuric method in the form of Audimomagnetotelleuric (ADMT) technology which can be used to determine the groundwater potential at the study location, where later the groundwater potential can be used to meet the community's water needs. The results of the ADMT track analysis on location show the continuity of groundwater potential on this path. Furthermore, an analysis of the ADMT path in the location B section shows the continuity of groundwater potential on the two tracks. At a depth of less than 40 meters, it is almost the same, while at a depth of more than 40 meters, it shows a different continuity. At a depth of less than 50 meters, it is almost the same, while at a depth of more than 60 meters, it shows a different continuity. If we look at the continuity of groundwater potential shown from ADMT-1 and ADMT-2, it shows that groundwater potential is dominant at 30 to 50 meters. So, from these two results, the selection of groundwater potential at ADMT-2 is 45 meters.
Silica Extraction Based on Quartz Sand Waste Sandblasting PT. Dok Lamongan with Base Method Ratri, Theofilia Medya; Prastiwi, Asya Wisma; Hudha, Mohammad Istnaeny; Rahman, Nanik Astuti
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 2 (2024): EDISI SEPTEMBER 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i2.6034

Abstract

Sandblasting is a method used to improve the surface structure of the material by using high pressure. Quartz sand is one of the abrasives used for sandblasting—quartz sand PT. Lamongan DOK contains silica (SiO2) of 83.4%. The method used in this study is the base method. The solvent used is KOH and NaOH with temperature variation of material preparation 600, 900, 1200 oC and variation of extraction time 1, 1½, 2 hours. The results showed that the most optimal variable with NaOH solvent was at the preparation temperature of 900 oC with 2 hours of extraction, and the amount of the extract yield was 28.5%. The following variable is at the preparation temperature of 600 oC with 1.5 hours of extraction, and the amount of the extract yield is 28.3%. Besides that, the optimal variable with KOH solvent is at the preparation temperature of 900 oC with 1.5 hours of extraction, and the amount of the extract Yield is 27.9%. XRD analysis showed that the extract obtained SiO2 in the form of Crystal Cristobalite and Quartz, and the FTIR analysis results detected the presence of O – H alcohol functional groups. It can provide information that sandblasting waste has a reasonably high Silica content, which can be utilized as a product with higher economic value.
Analysis Capabilities of Green Open Space and Quality Ambient Air Using Exhaust Gas Parameters on Motor Vehicles (CO2) (Case Study in Kendari City) Darmayani, Satya; Supiati, Supiati; Rosyanti, Lilin; Rahman, Nanik Astuti; Febrina, Wetri
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 2 (2024): EDISI SEPTEMBER 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i2.5762

Abstract

The rapid increase in population and land transportation in Kendari City has impacted the availability of green open spaces (GOS), which are crucial for maintaining air quality by absorbing carbon dioxide (CO2) emissions from motor vehicles. This study aims to assess the capacity of GOS in Kendari to absorb CO2 based on different vegetation types. The research employed a descriptive analysis method, with data collected through field observations and secondary sources, including information on GOS area, motor vehicle fuel consumption, and emission factors. The study found that Kendari City requires 17.73 hectares of GOS to absorb the CO2 emissions produced by motor vehicles, while the existing GOS covers 2,562.67 hectares. These indicate that the current GOS is sufficient to perform its environmental functions. Forests in the area absorb 10.292 tons of CO2, parks absorb 1.767 tons, green lanes absorb 27.682 tons, and other GOS areas, including the Kendari Botanical Gardens and sports fields, contribute more diminutive amounts. The results suggest that while Kendari's existing GOS can still manage CO2 emissions effectively, further expansion and optimization of green areas could enhance the City's environmental sustainability. This research provides valuable insights for urban planners and policymakers in Kendari, especially in planning for future GOS development to ensure continued air quality management.
Characteristics Plastic Blocks from Plastic Waste for Building Wall Materials (PBWBM): Foam Nets and Used Oil Kardita, Putu Cinthya Pratiwi; Thanaya, I Nyoman Arya; Aryasatya, Muhammad Maheswara; Putra, I Komang Edi Perdana
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 1 (2025): EDISI MARET 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i1.6466

Abstract

According to the Ministry of Environment and Forestry, total national waste in 2021 will reach 68,5 million tons. Of that amount, 17%, or around 11,6 million tonnes, was contributed by plastic waste. Fruit wrapping (foam nets) and thin plastic packaging are examples of plastic waste often found in society. This research will make fruit wrapping nets and use thin plastic packaging into plastic blocks for wall-building material (PBWBM). This research aims to determine the melting temperature, mixture proportions, and solidification temperature and analyze the characteristics of the plastic blocks using fruit wrapping nets, thin plastic packaging, waste motor oil, and rice husk ash filling materials. The PBWBM consisted of three types of samples, namely Mixture A (fruit wrapping net + waste motor oil), Mixture B (fruit wrapping net + used thin plastic packaging + waste motor oil), and Mixture C (fruit wrapping net + waste motor oil + rice husk ash). The right temperature for melting fruit wrapping nets and using thin plastic packaging with waste motor oil is 200 oC. The recommended PBWBM mixture proportion based on trial and error is 800 grams of fruit wrapping net and 600 grams of waste motor oil (compressive strength test results). The ideal compaction temperature ranges from 110 oC-125 oC, IRS test results range from 0,0135-0,0252 kg/m2.minute, water absorption content values range from 0,0281-0,0688%, and porosity values range from 0,720-2,006%. The compressive strength value without immersion was obtained in the range 29,826-42,063 kg/cm2, and the compressive strength value with immersion was obtained in the range 25,728-40,023 kg/cm2. The compressive strength values for the three types of PBWBM have reached the minimum average compressive strength based on BSN 1989 (≥ 25 kg/cm2).
Optimization of Phenolic and Flavonoid Extraction in Lavandula Angustifolia using Ultrasonic Assistance Extraction Ananda, Della; Julianti, Andi Ika; Akmal, Tubagus
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 1 (2025): EDISI MARET 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i1.6608

Abstract

Lavender contains active compounds such as flavonoids, tannins, coumarins, phytosterols, and minerals, which possess antioxidant properties and pharmacological potential. This study optimized the extraction process of lavender flowers to maximize bioactive phenolic and flavonoid yields. Ultrasonic-assisted extraction (UAE) was employed, and optimization was conducted using a Box-Behnken design in Design Expert 13.0.5.0 software. The influence of ethanol concentration, liquid-solid ratio (LSR), and extraction time on total phenolic content (TPC) and total flavonoid content (TFC) was evaluated. Results revealed that LSR significantly impacted the responses. Optimal conditions were determined as an LSR of 50 mL/g, extraction time of 26 minutes, and ethanol concentration of 26.12%. Validation under these conditions yielded a TPC of 152.26 mg GAE/g DE and a TFC of 68.59 mg QE/g DE, with percentage errors of −7.7% and 3.5%, respectively, demonstrating excellent agreement with the predicted values.
Evaluation of Section Shift Converter (HTS and LTS) Catalyst Performance Based on CO Conversion Value, Pressure Drop, and ATE Susmanto, Prahady; Yolanda, Alya Putri; Puspitasari, Riska; Anggraini, Dwi
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 1 (2025): EDISI MARET 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i1.6401

Abstract

The shift converter process uses Copper-promoted iron (HTS) and Copper/Zinc (LTS) catalysts to convert syngas into hydrogen through the water-gas shift reaction. Catalytic performance evaluation was conducted by analyzing parameters such as Approach Temperature Equilibrium (ATE), pressure drop, and CO conversion. The findings indicate that in the HTS unit, CO conversion ranged from 69% to 75%, with a significant decline to 69% in the fifth data set due to reduced catalyst activity. Key contributing factors to this decrease include catalyst deactivation caused by sintering and poisoning. Within the LTS unit, CO conversion reached a peak value of 94.08% following the catalyst replacement in January 2024. This observed pressure drop also significantly affected catalyst efficiency, as increased pressure drop reduced the contact time between reactant gases and the catalyst, decreasing optimal CO conversion efficiency. ATE analysis showed that the reaction did not always reach the expected thermodynamic equilibrium, particularly in the HTS unit, where ATE values exceeding design specifications indicated inefficient reaction performance. Catalyst efficiency in the shift converter is significantly influenced by catalyst lifespan, pressure drop, and various operational factors, thus requiring routine catalyst replacement to maintain optimal reactor performance.
Polyethylene Terephthalate (PET) Plastic Waste on Asphalt Concrete Mixture Wadu, Amy; Sodanango, Mateus R.; Nenobais, Obed; Bulan, Andro W.
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 2 (2024): EDISI SEPTEMBER 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i2.6114

Abstract

Polyethylene Terephthalate (PET) is a widespread thermoplastic polyester material used daily, especially in producing beverage bottles. Due to its popularity, PET waste is easily available in large quantities from various sources. Previous research shows that PET waste in asphalt mixtures has positive effects, namely increasing the elasticity of asphalt mixtures at high temperatures and improving the stability and stiffness of asphalt mixtures. This research used the Marshall testing method in two phases: Phase I for conventional AC design and Phase II for AC design modified with PET. The results showed that the optimum asphalt content obtained was 6.80%, while the optimum PET content was 4%. At these levels, the AC-BC mixture achieved the best balance between stability, yield, and density and met all the requirements of Bina Marga Specification 2018 Revision 2.
Evaluation Needs of Planting Water Using Cropwat Software at Darung Secondary Channel in Prawiro Kepolo Irrigation Area, Indramayu District Simanjuntak, Mangambit Juliandar; Nanda, Mahdika Putra
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 1 (2025): EDISI MARET 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i1.6473

Abstract

This study evaluates the availability and water needs in the Darung Secondary Channel (MG1-MG7) in the Prawiro Kepolo Irrigation Area, Indramayu District, during the second planting season. The water availability at the Darung Secondary Channel (DR) intake was calculated using the F.J. Mock method. In contrast, the water requirement in seven plots of mangosteen channel (MG1-MG7) was calculated by Cropwat simulation. Semi-monthly discharge data for 12 years is analyzed to determine the flagship discharge. The F.J. Mock method calculation results are 0.28 m³/second, and the field network data is 1.55 m³/second. So, the total availability of DR intake is 1.83 m³/second. The results of the Cropwat simulation show that the maximum water requirement in MG1-MG7 is 2.01 m³/second, resulting in a deficit of 0.18 m³/second. These findings confirm the need to optimize water in the deficit mangosteen channel. Recommendations include modernizing irrigation infrastructure and applying precision irrigation technology based on plants' needs. These measures are expected to improve water use efficiency and support agricultural productivity sustainability in the study area.
Analysis of Shear Wall Placement Configuration on Building Structure Behavior Hidayati, Nurul; Zarkasi, Ahmad; Hariyadi, Hariyadi; Sahlinda, Ranni
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 1 (2025): EDISI MARET 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i1.6197

Abstract

Lombok Island is one of the earthquake-prone areas, located between two earthquake generators. Based on these conditions, it is expected that construction in earthquake-prone areas can meet the standards. Shear walls are one of the earthquake-resistant structural systems used to resist lateral forces. Three alternative shear wall shapes will be analyzed using the numerical method: the L, I, and T shapes. The types of loads to be analyzed are dead loads, live loads, and earthquakes. Drawing from the findings of the conducted analysis, it is discovered that the most effective shear wall position in resisting lateral forces is the shear wall located at the corner of the building, based on the values of the drift that occur in the x and y directions. In addition, increasing the number of shear walls can reduce the internal forces that structural components experience. The optimum drift value is obtained from alternative 1, the L-shaped shear wall (elbow), with a drift value of 0.000495 mm in the x direction and 0.000883 in the y direction.
SAWFIER: A Solar-Powered Reverse Osmosis Desalinator for Clean Water Solutions in Coastal Communities Fikriansyah, Dzaky Aqillah; Damardhi, Sahi Rafael; Jimmy, Jimmy
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 1 (2025): EDISI MARET 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i1.6651

Abstract

Access to clean water remains a critical challenge for coastal communities worldwide, exacerbated by seawater intrusion, population growth, and insufficient infrastructure. Indonesia, as an archipelagic nation with extensive coastlines, faces significant disparities in clean water access, particularly in rural and underserved regions. This research develops and evaluates SAWFIER (Salt Water Purifier), a solar-powered desalination system utilizing the Reverse Osmosis (RO) principle, designed to provide sustainable clean water solutions in coastal areas. Performance testing was conducted using seawater with an initial salinity of 10,000 ppm. Key parameters, including salinity, pH, and water volume, were monitored at 5-minute intervals over a 120-minute operational period. The results demonstrated a consistent reduction in salinity to 1.36 ppt at the end of the test, with optimal performance observed up to 95 minutes, maintaining salinity levels below 1 ppt. The system generated an average daily energy output of 820.25 Wh from two 100 Wp solar panels, exceeding its energy consumption of 520.2 Wh, resulting in a surplus of 300.05 Wh. These findings highlight SAWFIER’s potential as an energy-efficient, scalable, and eco-friendly solution for addressing clean water scarcity in coastal regions. Despite challenges such as membrane fouling during prolonged operations, the system demonstrates strong alignment with Sustainable Development Goal (SDG) 6, emphasizing universal access to clean water and sanitation.

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