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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
 15   16   17   18   19 
Screening of Polysaccharide-Lytic Enzymes by Aspergillus Oryzae on Corncob (Zea mays) and Banana Peel (Musa acuminata Colla) Mufidah, Elya; Veliska, Audrya Nasywa; Mifzal, Adib Maula; Tantalu, Lorine
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.v10i1.6734

Abstract

Polysaccharide-lytic enzymes (PLEs)—xylanase, pectinase, amylase, β-glucosidase and endoglucanase—play key roles in the food, feed and bioenergy sectors by converting lignocellulosic waste into fermentable sugars. This study evaluated the ability of Aspergillus oryzae to produce these five PLEs on two abundant yet under-utilised agro-industrial residues: corn cobs (Zea mays) and banana peels (Musa acuminata balbisiana Colla). Submerged fermentation was performed using 1 % (w/v) substrate at 30 °C and 120 rpm. Enzyme activities were determined colorimetrically, and differences between substrates were analyzed using Mann–Whitney U test whereas the starch- and pectin-rich banana peels favour pectinase, amylase, glucosidase and endoglucanase, Spearman–Kendall correlation, and linear regression. The highest xylanase titre (12.8 ± 0.2 IU mL⁻¹) was achieved with corn cobs—about 1.5-fold higher than with banana peels (p 0.05). Conversely, banana peels significantly boosted pectinase (2.5 IU mL⁻¹), amylase (14.0 IU mL⁻¹), β-glucosidase (18.1 IU mL⁻¹) and endoglucanase (15.2 IU mL⁻¹) compared with corn cobs (p 0.05). Strong negative correlations (ρ ≈ −0.85 to −0.95) were observed between xylanase and the other enzymes, while the latter showed very strong positive intercorrelations (ρ ≈ 0.81–0.98). Linear regression confirmed that substrate type significantly affected enzyme yields (R² 0.90; p 0.001). These findings indicate that corn cobs are the most effective substrate for xylanase production, whereas banana peels better support pectinase, amylase, β-glucosidase, and endoglucanase synthesis. The results highlight the importance of selecting appropriate agro-waste substrates to maximise enzyme production and sustainably valorise agricultural residues 
Material Flow Analysis and Carbon Footprint Assessment of Rice Husk Biochar Production Using Slow and Fast Pyrolysis Methods Newol, Kristina Yaneti; Sasongko, Pramono; Wirawan, Wirawan
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.v10i1.6818

Abstract

The utilization of rice husk in Indonesia concentrate to low economic value products, while this biomass waste has significant potential for various higher-value applications. This study aims to analyze material flow (Material Flow Analysis) and calculate the carbon footprint of the rice husk biochar production process using pyrolysis methods. The pyrolysis techniques employed were slow pyrolysis and fast pyrolysis at the Renewable Energy Laboratory of Tribhuwana Tunggadewi University. This study shows that the slow pyrolysis method with 30.05 kg of rice husk input and 0.6 kg of water produces 38.2% biochar yield, while fast pyrolysis with 0.5 kg of rice husk input without water produces a yield of 40.6%. Carbon trail analysis revealed that in slow pyrolysis, of the total carbon input 0.971 kg only 0.674 kg identified in the final product (BioChar 0.410 kg, Bio-Oil 0.250 kg, gas 0.014 kg), while fast pyrolysis of the total carbon input of 3.003 kg produces 1,1532 kg carbon in the final product (biochar 0.415 kg, bio-il 0.5656 kg, gas 0.1726 kg), with electrical energy consumption that produces emissions of 1,983 kgCO2e. Pyrolysis technology has proven to convert rice husks into high -value BioChar, with fast pyrolysis shows a higher yield and better process efficiency without the addition of water. Although fast pyrolysis produces higher emissions, slow pyrolysis with the use of residual gas is more recommended for regions with limited electricity networks.
Analysis of the Use of Longbolt Type Connections Used as Main Connections in Folding Bridges Fatmawati, Haniya; Nindyawati, Nindyawati; Tamami, Fajar
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.v10i1.6673

Abstract

This research examines the use of folding bridges as an alternative to mitigate the impact of natural disasters that frequently occur in Indonesia. Folding bridges have been used in Japan, but they are not commonly used in Indonesia. The use of folding bridges in Japan has been designed to accommodate vehicles with a maximum load of 13.8 kN, in addition to pedestrians. The folding bridge used in Japan takes up to 5 minutes to stretch over the river. This research was conducted by determining the design of the folding bridge, starting from the dimensions used to make test objects. The analysis conducted in this study is a numerical analysis of a folding bridge with a span size of 5,000 mm, utilizing a longbolt type A490 bolt connection with a diameter of 12 mm. In the longbolt connection, a 32 mm ball bearing is also installed to provide driving force for the folding bridge when it opens and closes. The main profile used in this study is the UNP profile with dimensions 75 x 40 x 5 mm. The steel girder used is a steel border plate with a thickness of 3 mm and plate specifications that have a pattern to prevent it from slipping easily. The manufacture of folding bridge test objects focuses on the primary function for pedestrians when evacuating an area affected by natural disasters. This research focuses on the numerical analysis of static loads, providing the results of deflection values, as well as the need for bolts used as connections on the main profile. Calculations related to the bolt requirements used refer to the requirements of SNI 1729: 2020. The determination of the deflection value produced by the folding bridge, which has been designed using software, refers to the requirements of RSNI T-03-2005.
Analysis of the Individual Support Capacity of Pile Foundations Using a Pile Driving Analyzer Test Control Instrument: A Case Study of the SPK CSA Building Tower Plan 3A in Sidoarjo- Surabaya Anugrah, Haza Fitra; Revantoro, Nemesius Bambang
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 2 (2025): EDISI SEPTEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i2.6855

Abstract

Foundations play a crucial role in the stability of structures.  The 8-story CSA Tower SPK Building Plan 3A project uses pile foundations to support the load from the top of the structure to the soil layer beneath the building.  Pile foundations must undergo testing to demonstrate their ability to bear load.  This study analyzes the ultimate bearing capacity through a comparative analytical approach between the dynamic Pile Driving Analyzer Test (PDA) method and advanced analysis using CAPWAP (Case Pile Wave Analysis Program) with a numerical analysis method by evaluating the bearing capacity based on force and velocity wave data from the PDA Test to simulate static load tests and predict load displacement behavior.  The results of the study show that the maximum energy transfer (EMX) for the three different pile foundations, each with a pile number of T-174, is 5.60 tons.m, pile number T-317 of 4.37 ton.m, and pile number GT-31 of 5.60 ton.m, all tested with a Drop Hammer type weighing ±  4.00 tons at a height range of 1.5-2 m.  Further CAPWAP analysis results showed an average bearing capacity of 238.70 tons, which is 5.34% lower than the PDA result of 249.67 tons. The difference is due to more precise mathematical corrections in CAPWAP through signal matching analysis. Based on the maximum settlement standard of 25 mm, the maximum settlement in this study was 15.92 mm, with values below the maximum confirming the reliability of the foundation design. The PDA Test results showed the ultimate bearing capacity of the pile foundation.
Evaluation of the Reliability of Hospital Supplementary Building Structures Under Service Loads Mahfuda, Anno; Winarsih, Anita Lestari Condro
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 2 (2025): EDISI SEPTEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i2.7286

Abstract

The capacity of a building to bear the service loads that will be placed on it is a structural requirement. Reinforced concrete is the primary material utilized in this study. Its primary function is to endure the service load and fulfill the requirements stated in the relevant Indonesian standards. SAP2000, employing the finite element method, is utilized in this study to evaluate the building structure's performance in accordance with the relevant service loads. Based on the analysis, the structural element result remains below the allowable standard in terms of deflection; therefore, it does not require an adjustment in the size or quality of the service load performance. The study also reveals that the structural elements of the concrete slab are reacting to the stress and deflection that occur due to the structural service load. Based on the analysis, the highest stress in the deflection of the beam is 0.5816 mm, the highest deflection of the column is 0.089 mm, and the highest tensile stress of the concrete slab is 0.932 MPa. This study's result is an essential concern, where other structural elements, including columns, sloops, and beams, are safe enough to operate according to appropriate standards.
Implementation of Technical Aspects of Strengthening Existing Structural Columns Using Jacketing Fiber Reinforced Polymer (FRP) Carina, Annisa'; Oktaviastuti, Blima; Cahyono, Heru Setiyo
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 2 (2025): EDISI SEPTEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i2.7047

Abstract

Columns are vertical structural elements in construction planning and implementation, which play a crucial role in distributing loads from the superstructure to the foundation. Therefore, columns must meet the strength and safety standards stipulated in technical regulations such as SNI 2847:2019 and ACI 440.2R-17. However, in reality, structural columns are often found to have strengths that are less than required. The need to strengthen existing structural columns generally arises due to several reasons, including revisions to building functions that cause additional loads, aging buildings that begin to exhibit a decrease in structural capacity, or discrepancies between actual conditions and the initial planning design. This research was conducted on eight columns of the first floor structure of the JIIPE Tower construction project. The columns that were the object of the research are part of the main structure of a multi-story building planned as the JIIPE Tower building. Based on the results of calculations using SAP2000 for longitudinal and transverse reinforcement against the column force and geometry requirements, it is evident that the columns meet the requirements for the shortest side and the requirements for the cross-sectional dimension ratio; however, they do not meet the Axial Force Requirements. The study results show that the proper use of FRP can be an efficient and effective reinforcement method in increasing column capacity.
Evaluation of Vegetation Diversity and Emission Absorption Recommendations for Pandaan-Malang Toll Road (Segment Study 1-5) Nurita Prameswari, Putri; Ahmad Abdul Aziz, Hafif; Izatullilah, Izatullilah; Qolbi Prasetya Kautsarani, Yuhyil; Ayu Kusuma Dewi, Vita
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 2 (2025): EDISI SEPTEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i2.7105

Abstract

Toll road operational activities also harm the environment, one of which is the release of motor vehicle emissions. One way to reduce this impact is through the application of vegetation along the toll road. This study aims to evaluate vegetation based on integrated ecological functions along the Pandaan-Malang toll road corridor. This research employs quantitative methods, beginning with field observations and secondary data collection on the number of vehicles, followed by quantitative analysis of emission absorption capacity, and culminating in the preparation of recommendation strategies for the Pandaan-Malang toll road segment 1-5. Based on the study's results, it was found that emissions from vehicle volume were 63,320,311.04 kilograms of CO2/ year, with a total absorption capacity of vegetation along the Pandaan-Malang toll road segment of 51,080,719.78 kilograms of CO2/year. There is a shortfall of 12,239,591.26 kilograms of CO2/ year or 19.3% of total annual emissions. This finding indicates that the capacity of existing vegetation remains insufficient to offset the emissions generated by passing motor vehicles. Strategies and recommendations that can address the lack of absorption include the addition of vegetation, such as trembesi, dea shoes, and pule, with the amount and placement tailored to their specific needs. This research demonstrates that vegetation not only enhances the environment's beauty but also plays a crucial role in absorbing carbon dioxide (CO2) emissions and other pollutants. Through this approach, it is expected that the toll road will not only serve as a transportation route but also function as an ecological corridor that supports the improvement of environmental quality and public health. Vegetation recommendations should also consider adaptation factors to the local conditions along the toll road, such as pollutant levels, light intensity, and soil quality. Therefore, future research can involve field trials of vegetation resilience and actual carbon sequestration data.
Effect of Asbuton Type B50/30 and Oil Asphalt Variation on AC-WC Mixture Using Marshall Method Rahmawati, Rahmawati; Hakzah, Hakzah; Widarto, Hendro
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 2 (2025): EDISI SEPTEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i2.7325

Abstract

Asbuton is a promising local material that can partially replace petroleum asphalt in AC-WC hot mix asphalt. This study aims to investigate the influence of varying Asbuton B50/30 content on the performance of asphalt mixtures using the Marshall method. The optimum asphalt content (OAC) was determined to be 6.29%, followed by testing with Asbuton contents of 7%, 9%, and 11% of the total asphalt weight. The evaluated parameters included stability, flow, Marshall Quotient (MQ), and volumetric properties (VIM, VMA, and VFB), all assessed against Bina Marga technical specifications. The results indicate that 7% Asbuton content provides the best performance, yielding the highest stability (1977.70 kg) and MQ (632.35 kg/mm), while maintaining volumetric parameters within specification limits. At higher Asbuton contents (9% and 11%), stability and MQ declined, whereas flow and VFB increased, suggesting an over-binder effect that reduces structural integrity. These findings highlight the importance of proper Asbuton dosage control to balance mechanical and volumetric properties. This study contributes to the advancement of knowledge in asphalt pavement engineering by emphasizing the dual role of Asbuton as both a filler and a binder modifier, while also providing a scientific basis for utilizing local materials to support more sustainable pavement development.
Cyclic Behavior of Slender Shear Walls with Ultra High Performance Fiber Reinforcement Concrete Overlays Arifa, Geralda Nurry; Amalia, Aniendhita Rizki; Tajunnisa, Yuyun
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 2 (2025): EDISI SEPTEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i2.8126

Abstract

Shear walls serve as the primary structural elements for resisting lateral loads induced by earthquakes; however, slender shear walls remain susceptible to shear failure and buckling, particularly in structures designed according to older design codes. One strengthening technique that has gained increasing attention is the application of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) overlays, which offer high strength and effective crack control capabilities. This study aims to analyze the cyclic behavior of slender shear walls strengthened with a two-layer UHPFRC overlay with a total thickness of 40 mm using a finite element method based on the Concrete Damage Plasticity (CDP) model implemented in Abaqus. The numerical model is validated using experimental data from conventional reinforced concrete shear walls and UHPFRC-strengthened shear walls by comparing force–displacement responses, hysteresis curves, and tensile damage (Damage) distributions. The validation results indicate that the numerical model accurately captures the structural response, as evidenced by the close agreement in maximum displacement and damage mechanisms, with displacement differences of 2.97% for the conventional shear wall and 0.18% for the UHPFRC-strengthened shear wall. Parametric analysis shows that the UHPFRC overlay significantly increases the maximum load capacity from 328.22 kN to 525.37 kN, enhances the initial stiffness and first-yield capacity, and reduces the maximum displacement from 127.79 mm to 112.50 mm. Furthermore, the UHPFRC-strengthened shear wall exhibits a more stable post-peak response, fuller hysteresis loops, higher energy dissipation capacity, and more localized and gradually developing tensile damage compared to the conventional shear wall. These results demonstrate that a 40 mm-thick two-layer UHPFRC overlay effectively improves the shear capacity, cyclic stability, and seismic resistance of slender shear walls.
Performance Analysis of Corrugated Steel Plate Shear Wall with Geometry Variations Nadiva, Annasia Faza; Suswanto, Budi; Amalia, Aniendhita Rizki
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 10, No 2 (2025): EDISI SEPTEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v10i2.8147

Abstract

The use of stiffening elements in steel plate shear wall (SPSW) systems enhances lateral stiffness and energy dissipation capacity; however, it also significantly increases material and labor costs due to the complexity of fabrication and installation. As an alternative, the Corrugated Steel Plate Shear Wall (CoSPSW) system has been proposed as a more efficient and practical solution that maintains sufficient stiffness and strength without requiring additional stiffeners. This study investigates the structural performance of CoSPSWs with varying corrugation geometries using the finite element method. The analysis focuses on the influence of the corrugation angle on the overall structural behavior, including buckling stability, lateral stiffness, ultimate strength, and energy dissipation capacity. Nonlinear finite element simulations were conducted using ABAQUS software to capture the influence of geometric nonlinearities under lateral cyclic loading. The results show that increasing the corrugation angle significantly improves lateral stiffness and energy dissipation capacity, while maintaining stable post-buckling behavior. An optimal corrugation angle of approximately 60° provides the maximum strength and ductility among the specimens. This study contributes to understanding the behavior of corrugated steel shear walls and provides valuable insights for the design of efficient, cost-effective steel structures.

Page 18 of 19 | Total Record : 182

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