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INDONESIA
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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The Effect of Linear Alkylbenzene Sulfonate on Corrosivity of Vehicle Shampoo from Overproduction Softener Production in Industry Alzena Yulianto, Raisa Syifa; Hasannah, Cintiya Septa; Perdani, Meka Saima; Suci, Farradina Choira
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.v9i2.5915

Abstract

Indonesia is one of the countries with a significant number of laundry services, which has led to the emergence of numerous companies engaged in the production of high-quality softener products. This extensive softener production has resulted in a considerable surplus of the product, which can potentially harm the environment. This study aimed to process the excess products produced by the softener industry into vehicle shampoo and LAS (Linear Alkylbenzene Sulfonate), the main component of vehicle shampoo. We will achieve this through trial-and-error mixing methods and optimal variations. We aim to create products with sales value that the public can use to wash vehicles at a more economical price while maintaining quality comparable to commercial products. The optimal variation results obtained from this research were 40 ml of fragrance, 50 ml of Sodium Laureth Sulfate (SLES) Texapon, and 40 g of LAS, with test results of pH 7.92 and density 1.025 g.cm-3. The viscosity was found to be 2.41 Pa.s, the foaming power was 91.67%, and the corrosivity was 0.09291 mm/year. These results showed that the vehicle shampoo meets corrosion resistance standards. 
Shear Capacity on Corroded Fly Ash Reinforced Concrete Beam Using Galvanostatic Method Mooy, Merzy; Manubulu, Christiani Chandra; Bees, Azarya; Bela, Krisantos Ria
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 1 (2024): EDISI MARET 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i1.5577

Abstract

Corrosion can be triggered by a chemical reaction to the materials, establishing reinforced concrete's failure. For a long time, researchers have tried to find out how to prevent corrosion, a main structural construction issue. As a technology of waste material, fly ash has predominance, i.e., it is safer and greener than Portland cement. The finer size of fly ash can be an advantage in filling the concrete materials well. This research is about using fly ash as supplementary material on reinforced concrete beams and the galvanostatic method to accelerate corrosion. This research will compare the shear strength after corrosion of each normal beam and fly ash as a supplementary beam. A shear test of fly ash and a normal reinforced beam has been applied. Results showed that fly ash beams have 14% higher compressive strength and 3% higher shear strength with 14% smaller crack width than normal beams after corrosion. It also has a 3,5 times lower rate and 62% level of corrosion than normal beam
Performance of an Air-Cooled Heat Exchanger in a Separation Unit Based on Fouling Factor and Pressure Drop Ni'mah, Kamilah Pathun; Fitriah, Fitriah; Sari, Dessy Agustina
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 2 (2023): EDISI SEPTEMBER 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i2.4951

Abstract

Heat exchangers transfer heat from a high temperature to a low temperature in a fluid. Air-cooled heat exchangers are one of the most widely used types of heat exchangers, after shell and tube heat exchangers. Its performance is determined by calculating the fouling factor value and the pressure drop. The purpose of this case study is to evaluate the performance of a water-cooled heat exchanger in a plant that produces a thickening agent (CMC, or carboxymethylcellulose), which affects the amount of ethanol produced. Ethanol will cool from 79.347 to 54.133 oC, and air will cool from 31.333 to 59.667 oC as the cold fluid. The calculation results show that both reviews exceed the design threshold of 0.007056 h.ft2.oF/Btu. These heat exchangers require maintenance and repair. These results differ from the pressure drop values on the air side and pipe section, which are 1.2.10-3 inH2O and 0.647 psia, respectively. Both values remain outside the allowable limits. The performance evaluation of process equipment in the separation unit was aided by field data. The review of the data was able to predict a plant shut-down. This action was able to effect a partial or total plant shut-down due to fouling and scale exceeding design data thresholds.
The Influence of Base Isolator on The Reinforced Concrete Structures at Sapadia Mataram Hotel Earthquake-Induced Zarkasi, Ahmad; Hariyadi, Hariyadi; Hidayati, Nurul; Fitrayudha, Adryan; Heru, M.
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 1 (2024): EDISI MARET 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i1.5562

Abstract

Ring of Fire and at the intersection of three tectonic plates. Efforts are needed to minimize earthquake damage, one of which is the use of a base isolator system. This study aims to determine the effect of using High Damping Rubber Bearing (HDRB) with a diameter of 800 mm on the behavior of reinforced concrete structures in tall buildings under seismic loads. The research location is the 7-story Sapadia Hotel building in the city of Mataram. The research is conducted by analyzing a 3D model of the fixed base structure and the base isolator structure using numerical analysis. The results show an increase in the base displacement of the base isolator structure by 59% in the x-direction and 44% in the y-direction, while the inter-story displacement decreases by 36% in the x-direction and 69% in the y-direction. The use of base isolators can reduce the shear force by 35% in the x-direction and 15% in the y-direction. Based on the pushover analysis, the roof displacement values for the fixed base and base isolator structures are 0.159 m and 0.129 m respectively. These values can be used to determine the structural performance level according to ATC-40. The maximum drift value for the fixed base structure is 0.0055 m. For the base isolator structure, the maximum drift value is 0.0044 m, categorized as Immediate Occupancy (IO). This value can be used to determine the performance level of the structure based on ATC-40. The maximum drift value of the fixed base structure is 0.0055m. While in the base isolator structure, the maximum drift value is 0.0044 m which is included in Immediate Occupancy (IO). Thus, the use of base isolators in high-level buildings is able to reduce post-earthquake damage and the building is still safe to continue using.
Project Delays and Project Property Investment Decisions in Apartments: A Literature Review Oktaviastuti, Blima; Leliana, Arinda; Arifin, Isnani
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 2 (2023): EDISI SEPTEMBER 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i2.5289

Abstract

Apartment housing has become an option in big city areas, especially as land is becoming increasingly scarce and expensive. Apartment investment is an investor's choice at a time when demand is increasing every year along with the growth of the urban economy. Apartment construction projects begin construction based on appropriate planning to produce buildings of the right quality, cost, and time by minimizing one aspect of risk, namely the project delay factor. This article aims to present studies related to construction project delay factors; apartment buildings; investment analysis; and the impact of project delays on investment interest. The results show that construction delays have an impact on construction costs and time and further research is needed on the effects on investors' investment interest.ABSTRAKHunian apartemen menjadi salah satu pilihan di Kawasan kota besar terlebih lahan yang semakin berkurang dan mahal. Investasi apartemen menjadi pilihan investor di kala kebutuhan yang semakin tinggi tiap tahunnya seiring bertumbuhnya perekonomian di perkotaan. Proyek konstruksi apartemen memulai pembangunan yang didasarkan pada perencanaan tepat guna untuk menghasilkan bangunan yang tepat mutu, biaya dan waktu dengan meminimalkan salah satu aspek risiko yaitu faktor keterlambatan proyek. Artikel ini bertujuan memaparkan kajian terkait: faktor keterlambatan proyek konstruksi; bangunan apartemen; analisa investasi; dampak keterlambatan proyek terhadap minat investasi. Hasil didapatkan bahwa keterlambatan konstruksi berdampak terhadap biaya dan waktu konstruksi dan diperlukan penelitian lebih lanjut efek terhadap minat investasi investor.
Seismic Response Analysis In The Singaran Pati Sub-District Area of Bengkulu City Using Equivalent Linear And Non-Linear Approaches Priani, Anggela Agus; Misliniyati, Rena; Amri, Khairul; Mase, Lindung Zalbuin; ‎Hardiansyah, Hardiansyah
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.v9i2.6101

Abstract

Bengkulu City is prone to earthquakes due to its proximity to the meeting point of two active tectonic plates. Singaran Pati sub-district has six villages that are the center of the sub-district government, trade in goods and services, defense, and health centers. This study aims to determine the ground response in the Singaran Pati sub-district due to earthquake wave propagation. The one-dimensional seismic wave propagation modeling method is linear equivalent and non-linear, similar to the Pressure Dependent Hyperbolic (PDH) model, which propagates earthquake waves from the bedrock to the surface. This research resulted in maximum earthquake acceleration or Peak Ground Acceleration (PGA) parameters, acceleration spectra response, earthquake wave acceleration, and amplification factor. The PGA value and the amplification factor of the equivalent linear and non-linear models are the largest in the eastern ring sub-district, 0.53 g and 0.45 g. The results of the acceleration spectra response analysis of equivalent linear and non-linear passed the SNI 1726: 2019 design with the most significant value in the equivalent linear model of 2.38 g while the non-linear was 2.01 g. The most considerable earthquake wave acceleration value in the equivalent linear model is 0.53 g, and the smallest value in the non-linear is 0.31 g. The results of this study show that the equivalent linear model produces higher values than the non-linear model. The equivalent linear model shows an overestimation that causes the maximum acceleration value to be greater than the non-linear model, so the non-linear model is more appropriate to use because it is more by the conditions in the field.
Static Load Testing Of PCI-Bridges for Assessing Functional Suitability and Its Comparison with Dynamic Testing Khoeri, Heri; Isvara, Wisnu; Widjajakusuma, Jack; Natasa, Fani; Sofiana, Dini
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 1 (2024): EDISI MARET 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i1.5655

Abstract

 To accommodate the rapid development of residential and commercial areas in the Bumi Serpong Damai (BSD) Region, Banten, the construction of the Kadisurung bridge is necessary to integrate road networks. Before being operational to ensure the safety of bridge users, load testing is conducted. Parameters that must be met in the testing include not exceeding the strain and deflection limits during operational conditions, including when maximum loading occurs. To assess the bridge's performance during operation, research was conducted on both sides of the central span (western side bridge, JSB, and eastern side bridge, JST) with static load testing carried out with gradually increasing loads up to 50% UDL (136 tons), followed by gradual load removal. At JSB, the maximum deflection at 100% UDL, estimated from the deflection at 50% UDL, was 39.92 mm, and at JST, it was 31.67 mm, while the allowable deflection was 43.3 mm. Based on the deflection parameters, the relative capacities of JST and JSB are expressed as 108.5% and 136.7% respectively, relative to their allowable capacities. This indicates that the estimated bridge capacity using static load testing parameters is 6%-10% greater than when using parameters from dynamic load testing. Thus, the bridge is deemed suitable for operation.
Analysis of the Use of Modified Coal Bottom Ash as a Media for Immobilization of Microorganisms for the Production of Biogas from Macroalgae Prastyo, Elli; Ibrahim, Puji Astuti; Solikha, Dian Farkhatus
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 2 (2023): EDISI SEPTEMBER 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i2.4742

Abstract

Biofuel from macroalgae is referred to as the third generation biofuel because it does not require fertile land in the production process. Therefore, it is not included in the debate on the food sector. One of the process engineering in biogas production is the addition of immobilization media in anaerobic reactors. Coal combustion produces bottom ash solid waste containing 39.70% carbon (C) and 46.99% silica dioxide (SiO2) as well as other trace metals that have the potential to be used as absorbent materials or immobilization media in anaerobic decomposition. The purpose of this study was to determine the effect of the use of coal bottom ash-based immobilization media in the production of macroalgae biogas Spadina sp. The fixed variable in this study was the use of immobilization media of 30 grams, 40 grams, and 50 grams. Test parameters in the form of sCOD, VFA, biogas volume, and methane levels were used in this study. The production of macroalgae biogas Spadina sp is carried out in a fixed bed reactor with a capacity of 2000 mL with semi-batch conditions. The results showed that the highest biogas production was 204.8 mL/day with the use of immobilization media of 40 grams. The lowest biogas production is 20.5 mL/day with the use of 50 grams of immobilization media. The use of 50 grams of immobilization media is the best media to produce biogas with a high level of purity with an average of 57.48% followed by the use of 40 grams of immobilization media with an average of 41.35%, and the use of 30 grams of immobilization media with an average of 21.96%.
Climate Change Impact on Water Availability and Water Balance on Sampit Sub-Cachtment, Central Kalimantan Sulistyani, Kiki Frida; Irianto, Danang Bimo
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 1 (2024): EDISI MARET 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i1.5627

Abstract

Sampit River is part of the Mentaya catchment area, located in the East Kotawaringin Regency, Central Kalimantan, Indonesia. Sampit River is generally used as a water supply for domestic, industrial, and livestock needs. The Mentaya River water balance shows that for the year 2030 projection, the Sampit River is expected to experience a deficit, specifically during the first period of the month of October. This research was conducted using the SSP 1 2.6 climate change scenario. In this scenario, it is estimated that rainfall will change from +2.282 to +1.020% and increase in temperature ranging from 0.441-0.793 oC within the period 2021-2030 to 2041-2050. The calculation of 90% dependable flow shows climate change impacts the period of the year 2030 to 2050 when compared to the existing dependable flow. Likewise, the 95% dependable flow for river maintenance, also increases. The research concludes that the water balance endures climate change impact and the calculated deficit remains the same for the first period of the month of October. The results of the water balance show that until 2050 climate change had not impeded negative effects but cautionary efforts must be taken as there an increasing deficits for the years 2040 and 2050.  
Effect of Latex Rubber as Asphalt Additive to the Characteristics of AC-WC Mixture Sucipto, Prayogi Adi; Utami, Adita; Rahmatunnisa, Syifa Nurhaliza; Saputra, Syawaldi; Brawijaya, Brawijaya
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 2 (2023): EDISI SEPTEMBER 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i2.5143

Abstract

Quality improvement can be achieved by making innovations in the development of rubber asphalt material. This research was conducted to determine the effect of adding natural rubber as an additive to the wear-resistant Laston mixture (AC-WC). This study made 33 total samples, which were divided into 18 conventional asphalt mixtures and 15 rubber asphalt mixtures, with normal asphalt variations ranging from 5.5% - 8% and for rubber with variations of 5% - 7% of optimum asphalt weight, respectively each with an interval (0.5 %). It was mixed using a wet process. Based on the 2018 General Highways Specifications, Optimum Asphalt Content (OAC) was obtained at 7.5% and Optimum Rubber Content (ORC) at 6%. The test results for the stability and melting values of normal asphalt were 1786.22 kg and 3.56 mm, while the tests for the stability and melting values for rubber asphalt were 1181.22 kg and 3.6 mm. It can be interpreted that adding this rubber content increases the stability of the value 2x greater than the point where the stability value falls on the normal asphalt content variation of 8%. 

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