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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 197 Documents
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FTIR Spectroscopic Characterization of Keranji Seed (Dialium indum L.) as a Local Biosorbent for Pollutant Removal Sartika, Zulhaini; Ahmad, Saisa; Valentine, Deasy Amanda; Rudia, Ferdius
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.v10i2.7619

Abstract

Assessment of Sadawarna Dam to Support Environmentally Sustainable Development Setiawan, Rizki Bangun; Suharyanto, Suharyanto; Sukamta, Sukamta; Asad, Mohammad Bagus Wiratama
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.v10i2.6999

Abstract

 Sadawarna Dam, one of Indonesia's national strategic projects, located in the Cipunegara River Basin, plays a crucial role in ensuring food security, controlling floods, and providing a raw water supply. Community activities around the reservoir have the potential to degrade water quality, making continuous monitoring necessary. This study evaluates the water quality condition of Sadawarna Dam through analysis of physical, chemical, and biological parameters using the Pollution Index method (Minister of Environment Decree No. 115 of 2003) in the upstream, reservoir, and downstream areas, providing a comprehensive overview of pollution levels and their relevance to environmentally sustainable principles. Measurement results show that, based on Class I Water Quality Standards, the Pollution Index (PI) values range from 3.61 to 5.20. In comparison, based on Class II Standards, the PI values range from 3.54 to 5.11. These values indicate that water quality in the reservoir and downstream areas falls into the "Lightly Polluted" category, while the upstream area is classified as "Moderately Polluted." These findings emphasize the importance of water quality monitoring as a strategic environmental management measure to maintain the sustainability of the reservoir ecosystem and its benefits for the community. Therefore, the solution is to strengthen regular water quality monitoring systems, identify pollution sources, and promote collaborative efforts among the government, communities, and other stakeholders to ensure sustainable and environmentally sound reservoir management.
The Use of Sea Sand as a Substitute for Fine Aggregate in High-Strength Concrete Hidayati, Nurul; Hariyadi, Hariyadi; Zarkasi, Ahmad; Kusuma, Muhammad Holikul Bahari
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.8066

Abstract

Concrete is a common construction material whose quality depends on parameters such as compressive strength and split tensile strength. To reduce the environmental impact of river sand use, this study evaluates the use of sea sand as a partial replacement for fine Aggregate. Although sea sand contains salt, special treatment can reduce its salt content and is expected to improve the quality of high-grade concrete. The objectives of this study were to assess the impact of sea sand on the mechanical strength of concrete and to determine the optimum percentage of sea sand in high-quality concrete mixtures. This study used compressive strength, split tensile strength, and shear strength testing methods with variations in sea sand content in concrete mixtures of 0%, 25%, 50%, and 100%. The tests were conducted using a Compression Testing Machine (CTM). The results showed that using sea sand reduced the mechanical strength of concrete. Compressive strength decreased from 43.09 MPa to 29.91 MPa, splitting tensile strength decreased from 4.23 MPa to 1.21 MPa, and shear strength decreased from 10.23 MPa to 5.97 MPa with an increase in the percentage of sea sand. Therefore, it can be concluded that although sea sand can be used, its use in large quantities reduces the mechanical strength of concrete. The optimum percentage must be adjusted to balance sustainability and structural strength.
Evaluation of Lifetime and Sulfur adsorption on Zinc Oxide (ZnO) at Desulfurizer of Fertilizer Industry Rizki, Fadhilah; Ramadhanty, Rizky Vasya; Cundari, Lia; Anggraini, Dwi; Riduansyah, Muhammad
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.7726

Abstract

Fertilizer Industry has an ammonia unit to produce ammonia as the main raw material for urea production. The sulfur removal process occurs in the desulfurizer in the feed treating section to minimize ammonia production failure due to the toxic nature of sulfur for the catalyst in the reforming section. When the adsorbent is saturated in one of the desulfurizers, the desulfurizer position will be swapped and replaced with a new ZnO adsorbent. Lifetime evaluation of the adsorbent as well as analysis of the adsorption characteristics of the 108-DB desulfurizer were conducted to determine the adsorption performance by the adsorbent. Zinc Oxide (ZnO) adsorbent as of August 23, 2022 desulfurizer is still suitable for use and it is necessary to replace the new ZnO adsorbent when the fertilizer industry is Turn Around schedule, it is carried out in July 2023 in accordance with the design lifetime data of 3-4 years. The sulfur adsorption process of PUSRI-IIB feed treating section by ZnO adsorbent in desulfurizer follows the second-order kinetics model with the adsorption rate constant (k) value obtained as -0.3339 (month-1). The adsorption isotherm that takes place follows the Langmuir isotherm model and belongs to the type of chemical adsorption (chemisorption) with the maximum adsorption capacity (qe) and Langmuir adsorption constant (KL) values of 0.0629 mg/g.hr and 3.283977 L/mg, respectively.
The Effect of pH on Methylene Blue Removal Efficiency at Different Ozonation Times Adhiksana, Arief; Irwan, Muh; Luvita, Veny; Harjanto, Harjanto; Patmawati, Yuli; Megawati, Eka; Vegatama, Meita Rezki; Ulfa, Elis Diana; Maulidyawati, Putri; Julianty, Rachma Sherlyn
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.7788

Abstract

The textile industry has experienced growth over time, and methylene blue (MB) is one of the most frequently utilized dyes. Methylene Blue impacts human health in various ways, including causing skin irritation and systemic effects like changes in blood composition. Thus, ozonation is an alternative method for treating MB wastewater. This study aimed to investigate the effects of reaction time and pH conditions on MB degradation through ozonation. Compared with traditional treatment methods, which often result in the production of by-products, ozonation is regarded as a more environmentally sustainable approach for wastewater treatment. In this study, MB was prepared at an initial concentration of 50 mg/L, with a sample volume of 500 mL, at 25°C. The variations included reaction times of 10 and 20 min and pH levels of 3, 5, 7, 9, and 11. Ozonation was performed using an ozone generator with a flow rate of 200 mg/h. The ozonation results were analyzed using a UV-VIS spectrophotometer at a wavelength of 665 nm for MB. The results demonstrated that optimal performance was achieved at a pH of 7 with a reaction time of 20 minutes, resulting in a final concentration of 0.49 mg/L. This corresponded to a significant 99% removal of MB.
Isolation of Flavonoids from Walang Sangit Leaves (Eryngium Foetidum) Using Methanol and Acetone Maceration with UV–Visible Spectrophotometric Analysis Suhirman, Suhirman; Ardian, Adna Ivan; Sawali, Fikrah Dian Indrawati; Afandy, Moh Azhar
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.8072

Abstract

Flavonoids are natural phytonutrient compounds in plants that exhibit antioxidant properties and play a role in scavenging free radicals. Walang sangit leaves have potential as a source of flavonoids, with samples consisting of young and mature leaves obtained from Pagebangan, Ciwandan District, Cilegon City. The sample preparation stage was carried out through extraction using the maceration method. The experimental procedure involved 10 g of dried walang sangit leaves ground to 60 mesh, which were macerated using 99.95 percent methanol and 80 percent acetone solutions. The volume of methanol and acetone used was 250 mL, with maceration times of 60 and 120 minutes in an Erlenmeyer flask. At 120 minutes, the methanolic extract yielded 2.81 mg QE/g (young leaves) and 4.12 mg QE/g (mature leaves), whereas the acetone extract only reached 1.03 mg QE/g and 2.88 mg QE/g, respectively. A similar pattern was also observed at 60 minutes, with methanol producing values of 1.39 – 2.32 mg QE/g, which were higher than those obtained with acetone (0.35 –0.78 mg QE/g). The highest extraction rate constant was obtained for acetone–mature leaves (0.0124 / min) and for methanol young leaves (0.0058 / min).
Seismic Response of Reinforced Concrete Structures Using Pushover Analysis with Varying Number of Storeys Ariyanto, Muhammad; Purba, Ronny Hasudungan; Riyanto, Hery
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.8330

Abstract

This study evaluates the influence of vertical geometric variation on the seismic response and inter-story drift of reinforced concrete Special Moment Resisting Frame (SMRF) buildings located in the high seismic zone of Bandar Lampung. Three hypothetical 30-meter-tall models were analyzed: Model A (12 stories), Model B (10 stories), and Model C (8 stories). Nonlinear static pushover analysis was performed in accordance with SNI 1726:2019 and ATC-40 criteria. The results indicate that variations in story height significantly affect the dynamic characteristics and deformation patterns of the structures. Model A exhibits the shortest natural period (T = 1.559 s) and the largest base shear capacity (8,722 kN), but shows more limited post-yield behavior due to the short column effect. Model C produces the highest drift ratio (1.072%) as a result of the more dominant P-Delta effect. All models achieve the Life Safety (LS) performance level, with the majority of plastic hinges remaining in the Immediate Occupancy (IO) category, indicating available deformation capacity. Within the scope of this study, Model B is considered the most balanced configuration in terms of stiffness, drift, and ductility, and is therefore recommended as a balanced vertical geometric configuration for 30-meter-high buildings. 
The Effect of Adding MTMS (Methyl-trimethoxysilane) as a Pore Former on the Absorption of Hydrogels Based on NACMC (Sodium Carboximethyl Cellulose) Anggraini, Dwi; Susmanto, Prahady; Aprilia, Ananda; Damayanti, Delfiana Triaprilia
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.7643

Abstract

Superabsorbent hydrogels (SAHs) possess the remarkable ability to absorb and retain large amounts of water, making them promising eco-friendly materials for various applications. In this study, sodium carboxymethyl cellulose (NaCMC) was employed as the main polymer, modified with polyvinyl alcohol (PVA) to enhance structural stability through hydrogen bonding, and crosslinked with methyltrimethoxysilane (MTMS) to generate water-retaining porous networks. The effects of varying PVA and MTMS concentrations on the absorption capacity and chemical structure of the hydrogels were systematically investigated. The results demonstrated that the formulation containing 3 g of PVA and 4.71 mL of MTMS (B3) exhibited the highest absorption capacity of 453%, indicating optimal performance. These findings highlight the potential of NaCMC-based hydrogels as sustainable superabsorbent materials with promising applications in agriculture, water management, and biomedical fields.
Rainfall-Induced Shallow Slope Failure and Mechanism-Based Stabilization of Telecommunication Infrastructure Khoeri, Heri; Nugroho, Panji; Rizqullah, Naufal Rafif
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.8315

Abstract

Rainfall-induced shallow slope failure is a recurrent geotechnical hazard in tropical regions, particularly for slopes supporting critical infrastructure. This paper presents a case study of a shallow translational failure at a telecommunication facility in Batam, Indonesia, following prolonged heavy rainfall. The study integrates subsurface investigation (six boreholes with SPT, electrical resistivity surveys, and laboratory testing) to establish engineering stratigraphy consisting of three units: an upper loose to medium silty sand (Unit I), a medium to dense sand (Unit II), and competent sandstone (Unit III). Limit-equilibrium stability analyses were performed under dry and various rainfall infiltration scenarios, with rainfall effects represented by a rising perched water table (PWT). Results show that the slope is highly stable under dry conditions (factor of safety, FS ? 1.996). However, as the PWT rises from 4 m to 1 m below ground surface, the FS progressively decreases from 1.384 to 0.931, indicating that rainfall-induced pore water pressure increase and loss of matric suction are the governing failure mechanisms. Based on this mechanism, a combined mitigation strategy incorporating surface drainage improvement and soldier pile reinforcement was developed. Under the most critical rainfall scenario (PWT at 1 m depth), the reinforced slope achieves an FS of approximately 1.593, exceeding the recommended minimum of 1.5 for strategic infrastructure. The study highlights the necessity of explicitly incorporating rainfall-driven groundwater rise into slope stability assessments for critical facilities in tropical environments and provides a mechanism-based framework for effective stabilization.
Performance Evaluation Against Cost and Time Using Earned Value Analysis (EVA) and Mean Absolute Percentage Error (MAPE) Samosir, Desma; Kristiana, Retna; Sediyanto, Sediyanto
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 11, No 1 (2026): EDISI MARET 2026
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v11i1.7500

Abstract

Development in the construction sector is rapidly advancing with technological progress. This research focuses on the Damaged Fence Repair project in Karawang, which has a total work length of 780 meters. This project is a response to fence damage that limits the area of PT. Pindo Deli is located along the river flow and in residential areas. However, the project's implementation has been delayed and is estimated to be completed on April 22, 2025. The delay occurred after the progress reached 507 meters due to various factors. To address this issue, the Earned Value Method (EVM) is used to assess cost and time performance, and the Mean Absolute Percentage Error (MAPE) is used to measure the accuracy between the plan and the actual results. This analysis is expected to contribute to service providers considering similar future projects. The research results indicate that the implementation is not on schedule, with a total cost of Rp. 2,199,059,894.34. The cost performance index (CPI) shows a value of less than 1, indicating waste, while the schedule performance index (SPI) is less than 1, indicating delays. There was a time deviation from the 18-week plan to 22 weeks, and a cost deviation of Rp. 509,880,654.62. The MAPE for time was 22.59% and for cost 17.05%, indicating good accuracy. This research provides a significant methodological contribution by integrating EVA performance metrics with MAPE accuracy analysis, offering a more comprehensive evaluation framework that not only identifies deviations but also validates the reliability of planning estimates, which serves as a strategic model for optimizing project control in specialized industrial infrastructure repairs.

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