Rekayasa Sipil https://rekayasasipil.ub.ac.id/index.php/rs <p><strong>E-ISSN : 2502-6348</strong> |<strong>P-ISSN : 1978-5658 |DOI prefix : 10.21776/ub.rekayasasipil</strong></p> <p>Welcome to <strong>Rekayasa Sipil</strong>.</p> <p><strong>Rekayasa Sipil</strong> is an open-access peer-reviewed journal that mediates the result of the study, research, and development of science and technology in Civil Engineering with scope of Structural Mechanic, Construction Management, Material, Transportation, Water Resources, and also Geotechnical Engineering.</p> <p>The author may write an article in accordance with <strong>template of Rekayasa Sipil</strong> and submit the article online by using OJS system. We accept articles in Indonesian or English.</p> <p>Rekayasa Sipil is published three times in a year : February, June and October. Starting in 2023, Rekayasa Sipil will publish 15 papers for every issue.</p> <p>Since September 2017 we have been a proud member of <strong>CROSSREF</strong>. <strong>Rekayasa Sipil</strong> <strong>DOI</strong> <strong>prefix is </strong><strong>10.21776</strong>. Therefore, all articles published by <strong>Rekayasa Sipil </strong>will have a unique <strong>DOI number.</strong></p> <p><strong>Rekayasa Sipil </strong>has been indexed in <strong>Directory Open Access Journal (DOAJ, GOOGLE SCHOLAR, IPI, SINTA,</strong> and <strong>ONESEARCH</strong>) and also nationally <strong>accredited as</strong> <strong>S3</strong> by the Ministry of Research, Technology, and Higher Education of the Republic of Indonesia (Decree No. <strong><a href="http://sipil.ub.ac.id/sarjana/wp-content/uploads/2020/08/Akreditasi-Rekayasa-Sipil.pdf">30/E/KPT/2019 on November <strong>11th,</strong> 2019</a>) (click the decree number to download)</strong></p> Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya en-US Rekayasa Sipil 1978-5658 <p><a href="http://creativecommons.org/licenses/by/4.0/" rel="license"><img src="https://i.creativecommons.org/l/by/4.0/88x31.png" alt="Creative Commons License" /></a><br />This journal is licensed under a <a href="http://creativecommons.org/licenses/by/4.0/" rel="license">Creative Commons Attribution 4.0 International License</a></p> ANALISA BIAYA OPERASIONAL KENDARAAN PADA ANGKUTAN UMUM BUS (TRAYEK PALANGKA RAYA – PANGKALAN BUN) https://rekayasasipil.ub.ac.id/index.php/rs/article/view/792 <p><em>Bus transportation existence in Central Kalimantan is very important because it is able to carry out mass transportation, connecting and reaching all areas of Central Kalimantan. This research was conducted to obtain the appropriate amount of vehicle operating costs and passenger fares to be applied under normal conditions and during the COVID-19 pandemic. Primary data were obtained through questionnaires, namely vehicle operating costs components data and passenger trips data. Analysis was carried out based on Decree of Transportation Minister No. KM. 89 of 2002. Vehicle operating costs per seat kilometer for the Palangka Raya – Pangkalan Bun route on the Damri Bus are IDR 131.04/seat-km, while the Logos Bus is IDR 170.97/seat-km. Under normal conditions, the Damri Bus fare is IDR 190,453/passenger, while the Logos Bus fare is IDR 134,241/passenger. During the COVID-19 pandemic, the Damri Bus fare was IDR 216,707/pnp, while the Logos bus fare was IDR 198,435/pnp.</em></p> Ari Widya Permana Nirwana Puspasari Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 1 6 10.21776/ub.rekayasasipil.2023.017.01.1 Prediksi Kuat Tekan Beton Agregat Recycle Campuran Air Laut dengan Schmidt Rebound Hammer Test https://rekayasasipil.ub.ac.id/index.php/rs/article/view/801 <p class="TTPAbstract">Nowadays, using recyled aggregate and seawater as replacing natural aggregate and freshwater in mixing have been main priority to be a new concrete construction material. However, in order to asses their strength performance in fast and accurate, an appropriate method needs to be determined. Therefore, the aim of this research is to evaluate and predict the compressive strength of recycled aggregate concrete (RAC) mixed seawater using Schmidt rebound hammer test (SRH) and the result value was corresponded to concrete compressive testing machine (CTM) as control test of concrete specimens. Total 72 samples divided into three concrete mixtures were designed and prepared in cylindrical samples with w/c ratio of 0.45 and target compressive strength of 25 MPa. The first mixture was named natural aggregate concrete (NAC) or BAN as control concrete with 100% natural aggregate and fresh water. The second and third mixtures were named BAR-50 and BAR-100 with the BAN replacement of 50% and 100% RAC respectively. Seawater as mixing was performed in mixture concrete of BAR-50 and BAR-100. All sample mixtures were then wet cured at different age of 7, 28, 56 and 90 days in fresh water. The results show a good correlation between SRH and CTM tests with having high correlation of R<sup>2</sup>=0.9908. Also, a proposed mathematical model, equation 1, is created for quick calculation in predicting compressive strength of RCA. Therefore, the usage of SRH test is a realistic alternative to predict the compressive strength of recycled concrete with different percentage of replacement of NAC and mixing seawater.</p> Lusman Sulaiman Ispianto Muhammad Fahrizal Nur Umar Hamzah Matottorang Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 7 14 10.21776/ub.rekayasasipil.2023.017.01.2 Indikator Penyebab Praktik Korupsi Pada Industri Konstruksi Di Sumatera Barat https://rekayasasipil.ub.ac.id/index.php/rs/article/view/907 <p><em>The main objective of this research is to identify and analyze indicators of the causes of corrupt practices in the construction sector in West Sumatra. Research methodology used descriptive statistics and inferential statistical analysis used in the test is Cronbach's Alpha. The results of Cronbach's Alpha test can be seen in the value in the Corrected Item-Total Correlation column for the number of variables as many as 30 can be seen in r table 0.361. This is also supported by Cronbach's alpha value of 0.960. The indicator that causes corruption in the first rank is the existence of tender evaluations that do not meet the criteria (X9). Conclusion in this research are 10 variables (out of 30 variables) indicators of the causes of corrupt practices in construction projects in West Sumatra.</em></p> vivi ariani Dwifitra Y. Jumas Wahyudi P. Utama Wenny W. Wahyudi Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 15 22 10.21776/ub.rekayasasipil.2023.017.01.3 U-DITCH PRACETAK BERDASARKAN SNI 1725: 2016 SEBAGAI STANDAR DESAIN https://rekayasasipil.ub.ac.id/index.php/rs/article/view/938 <p>Generally, local precast U-ditch does not yet have consistent dimensions and quality. The dimensions of the u-ditch are too large or too small with low power, making the u-ditch inefficient. This is because there is no design standard for U-ditch. This study aims to determine the strength of local precast U-ditch based on SNI 1725: 2016. The results of this analysis show that the flexural resistance of local U-ditch products is smaller than the external loads (𝝓 Mn &lt; Mu).</p> Titin Sundari Fatma Ayu Nuning Farida Afiatna Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 23 30 10.21776/ub.rekayasasipil.2023.017.01.4 DAMPAK NEGATIF PROYEK PEMBANGUNAN RUMAH TINGGAL TERHADAP BANGUNAN DI SEKITARNYA – STUDI KASUS DI SURABAYA https://rekayasasipil.ub.ac.id/index.php/rs/article/view/940 <p><em>The need for housing in a metropolitan city such as Surabaya will increase with time. These needs can be met by building new houses or renovating. Sometimes the construction and renovation of houses will more or less have an environmental impact on the surrounding buildings. The case study in this paper aims to increase public awareness of the impact of construction project on the surrounding buildings. The case study was conducted by doing field observations on the location of a residential house construction which had an impact on the adjacent houses, located on the right and left side. It was obtained that the damage to the adjacent houses was caused by the demolition of the old building, the addition of loads, and the process of compaction of the backfill. Repair and strengthening of buildings must be carried out to restore the function of the building and prevent further damage. Unfortunately, repairing the building requires significant additional costs and causes the construction time to be longer. </em></p> Daniel Tjandra Paravita Sri Wulandari Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 31 36 10.21776/ub.rekayasasipil.2023.017.01.5 THE ASSESSMENT OF CITARUM RIVER WATER QUALITY IN MAJALAYA DISTRICT, BANDUNG REGENCY https://rekayasasipil.ub.ac.id/index.php/rs/article/view/980 <p>Citarum River is one of the biggest rivers in Java Island and the primary source of Jakarta's water supply. Named the dirtiest river globally in 2013, the Indonesian government is committed to improving the Citarum River's water quality by 2025. However, the Majalaya District, the center of the textile industry area in the upstream part of the Citarum River, is indicated to have significantly contributed to the river pollution. Hence, it is essential to conduct a study to evaluate the water quality in the Citarum River, especially in the Majalaya District. The results showed a considerable decrease in water quality from upstream to downstream of the Citarum River in 2013-2021. Concurrently, it was also found that the factory effluent far exceeded the permissible limit.</p> Finna Fitriana Doddi Yudianto S Sanjaya Andreas F V Roy Yong Chan Seo Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 37 46 10.21776/ub.rekayasasipil.2023.017.01.6 OPTIMASI WAKTU DAN BIAYA PELAKSANAAN PROYEK JALAN DENGAN METODE CRASH PROGRAM (STUDI KASUS PEMELIHARAAN JALAN KECAMATAN TENGGARONG SEBERANG DAN TENGGARONG) https://rekayasasipil.ub.ac.id/index.php/rs/article/view/1030 <p class="KataKunci"><em>Time, cost, and quality are three important elements of schedule that should be made in detail in order to assist in the evaluation of the project. In this research, we analyzed the acceleration of project completion duration. The case study on this research was taken in Tenggarong Seberang District and Tenggarong District. The method used in this research is the crash program method with the alternative implementation with a variety of added work hours and manpower, which are adding 1 hour, 2 hours, and 3 hours of work hours also the alternative of adding 25% and 50% of the manpower. This research aimed to determine the total time and cost of implementing the project after the crashed and determined the results of an optimal acceleration alternative by comparing the results of the analysis of the application of the crash program method. The work was accelerated (crashed) in this research is work that is on the critical path. The results of the application of the crash program method with the addition of working hours and manpower obtained an efficient acceleration alternative, namely the addition of 3 hours of working hours which resulted in the acceleration duration being 67 days or 25.56% faster than the normal duration of 90 days with a total acceleration cost of Rp 1,213,717,588.81 or 0.213% lower than the normal total cost of Rp 1,216,303,515.90.</em></p> Bernardo Sandrini Salasa Sandrini Salas Dharwati P. Sari Anung Sudibyo Achmad R. Nur Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 47 53 10.21776/ub.rekayasasipil.2023.017.01.7 PEMETAAN GEOSPASIAL RISIKO BANJIR DI SUB-DAS GUNTING, JOMBANG JAWA TIMUR https://rekayasasipil.ub.ac.id/index.php/rs/article/view/1047 <p>Floods are the most recurring natural disasters and impact human life, causing a severe economic downturn. The level of flood risk is a function of hazard and vulnerability. Flood risk-prone areas need to be identified to reduce the flood risk level. This study aims to assess flood risk based on spatial analysis results with Geographic Information Systems (GIS). The flood hazard map is built from remote sensing-based data in the form of a digital elevation model (DEM) applied using the frequency ratio weighting (FR) technique. Vulnerability maps are generated from social, economic, physical, and environmental data applied through techniques overlays weighted using the analytical hierarchy process (AHP). The resulting risk map shows that 21.93% and 6.40% of the total area are at a very high and high level of flood risk. This map is very useful for planning the flood management.</p> Arbi Tri Kuswardhana entin hidayah Retno Utami Agung Wahyono Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 54 65 10.21776/ub.rekayasasipil.2023.017.01.8 AN IMPLEMENTATION OF LEAN CONCEPT WITH 5S TO ELIMINATE MATERIAL WASTE IN PRECAST FACTORY https://rekayasasipil.ub.ac.id/index.php/rs/article/view/997 Precast industry is currently experiencing an increase in demand from consumers. Due to increasing demand, a wide variety of products, and push production systems, factories suffer from excess waste, disorganized workplaces, and unhealthy working environments, so it needs a method to overcome these problems. In overcoming this problem, research was carried out by implementing a lean concept with the concept of Seiri, Seiton, Seiso, Seiketsu, Shitsuke (5S) on the handling of waste materials that occur in the precast concrete production process. Material waste is obtained from interviews and analysis of the production cost budget assisted by the Pareto 80/20 method to determine materials that are included in the waste category. From the results of the Pareto analysis, it was found that 5 materials were wasted, namely Reinforcement Ø 13, Concrete Sand, Wire, Oil Formwork Console, and PC Strand 12.7. Then the results are re-analyzed with cause analysis based on the results of brainstorming with a quantity surveyor, two material wastages were obtained, namely wire and formwork console oil. The waste will be repaired with the seiri concept in the form of making a warehouse near the work area, so that later it will eliminate material wastage so that it can save oil. 2930-liter console formwork and 5915 kilograms of wire, with a total cost savings of IDR 123,758.060 Roland Gasenda Suryaningrat Indradi Wijatmiko Yatnanta Padma Devia Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 66 70 10.21776/ub.rekayasasipil.2023.017.01.9 ANALYSIS OF MASONRY BEHAVIOR ON NON-ENGINEERED HOUSE BUILDING TOWARDS LATERAL DEFORMATION BY USING FINITE ELEMENT METHOD BASED ON GUIDELINE https://rekayasasipil.ub.ac.id/index.php/rs/article/view/998 <p class="IsiAbstrak">This study is based on the abundant damaged house building during the earthquake. Wall is an important part of a non-engineered house. It is constructed by clay bricks and mortar. The damage happened to the house building is not separated from the specification of the clay bricks used. Dynamic simulation towards the non-engineered construction would reveal the displacement value that happened to the structure of mansory that applies the guidelines from SNI, ACI, and condition in the field. The dynamic simulation of an ordinary non-engineered house employed finite element method. The purpose of this research is to find out the mechanical performance of the mansory when the earthquake is occurring. The method implemented in this research is scientific analysis through collecting the available theories and data from the previous research. A scientific method is started with deciding a concept based on the events frequently and generally happened in the field which are also considered a novelty. The following step is conducting data analysis by using finite element method where the maximum deformation displacement value reached ux 0.008 cm, uy 0.044 cm and uz 0.008 cm. From the simulation it can be concluded that the biggest displacement happened to mansory constructed based on the field condition.</p> SRI HENY HIDAYATI Agoes Soehardjono wisnumurti wisnumurti Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 71 77 10.21776/ub.rekayasasipil.2023.017.01.10 Investigasi Kuat Geser Antara Lapisan Permukaan Campuran Aspal Panas Akibat Pengaruh Waktu Penundaan dan Sebaran Tack Coat https://rekayasasipil.ub.ac.id/index.php/rs/article/view/894 <p>The hot asphalt surface layer is layered and has different functions in the pavement structure. In addition to being able to distribute the vertical load of the vehicle, it must also be able to withstand the lateral load of the vehicle. The lateral load of the vehicle that is too large causes a shear force which will have an impact on the release of the bond between the layers of hot asphalt mixture. Therefore, it is necessary to conduct research to determine the shear strength between layers of hot asphalt mixture. Several factors that cause the level of bonding strength between layers of hot asphalt mixture are the distribution of the tack coat, the setting time, the type of tack coat, and the presence of adhering dirt. The purpose of this study was to determine the effect of variations in the distribution of tack coat 0.25 and 0.35 l/m<sup>2</sup> and setting time of 60, 90, and 120 minutes on the shear strength between layers of hot asphalt mix asphalt concrete wearing course (AC-WC) and asphalt concrete base course (AC-BC). The laboratory testing method selected by using modified soil shear test equipment. The test results show that the number of distributions and the length of setting time will cause an increase in the shear strength between the hot asphalt mixture. The maximum shear strength in the distribution of 0.25 l/m<sup>2</sup> is 0.59 kg/cm<sup>2</sup> and the distribution of 0.35 l/m<sup>2</sup> is 0.64 kg/cm<sup>2</sup> with a setting time of 120 minutes. It can also be concluded that setting time has a more significant effect on shear strength between asphalt pavement layers than the distribution of tack coat.</p> Hery Awan Susanto Kartika Fathma Dewi Gito Sugiyanto Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 78 86 10.21776/ub.rekayasasipil.2023.017.01.11 KAJIAN POTENSI PENERAPAN EXTENSIVE GREEN ROOF BERBASIS STRUKTUR KAYU DI INDONESIA https://rekayasasipil.ub.ac.id/index.php/rs/article/view/925 <p>The availability of green space is decreasing along with the increase in population. Since then the land has been replaced by buildings as more people need a place to support human activities. As a result, the absorption of heat increases, causing the temperature in urbanized areas are higher relative to outlying areas (Urban Heat Island). Therefore, some efforts need to be made to reduce heat absorption, one of which is by applying the green roof. A strong roof structure and roof panel are required to implement green roofs. Wood is a material that has both strength and lightweight. However, the use of wood panels for roofing is not common in tropical areas due to the high rainfall. The wood roofing still has a potential to be used through the application of green roof technology that accommodate a waterproof layer and is not easily degraded by planting media. This study aims to examine the potential use of green roofs which made of wood structures and wood roofing in a tropical climate.</p> Ika Rahmawati Suyanto Widyastuti Kusuma Wardhani Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 87 93 10.21776/ub.rekayasasipil.2023.017.01.12 PENGARUH PENAMBAHAN SERBUK KACA PADA STABILISASI TANAH LEMPUNG LUNAK DI DAERAH KABUPATEN KARAWANG https://rekayasasipil.ub.ac.id/index.php/rs/article/view/912 <p><em>Problems that are often encountered in road construction are poor and unstable soil conditions. Soil conditions greatly affect the design process and the durability of the road. One thing that is usually done to improve soil properties is to add mixed materials to improve the soil properties. The purpose of this study was to determine the effect of adding Waste Glass Powder (WGP) on soil consistency and CBR value. The percentage of WGP used is 2.5%, 5%, 10%, 15% and 25%. The result is that the addition of WGP has significantly improved soil quality. The value of the plasticity index of the soil decreases, which means that the potential for swelling and shrinkage of the soil is also decreased. The CBR value of the soil also increased to 341.04%.</em></p> <p> </p> <p> </p> Bayu Mustika Bhakti Sri Wulandari Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 94 100 10.21776/ub.rekayasasipil.2023.017.01.13 DURABILITAS CAMPURAN AC-WC MENGGUNAKAN BATU GUNUNG BABA, TANA TORAJA https://rekayasasipil.ub.ac.id/index.php/rs/article/view/919 <p>The decline in road service conditions in the form of road damage can be caused by water due to high rainfall so that it enters the pavement layer. This study aims to determine the durability or resistance of the AC-WC mixture using Mount Baba stone. By using the Marshall test method, the results obtained through the Marshall immersion test with variations in immersion time from 0.5 hours - 60 hours, namely the durability value of 95.02 % - 86 34%. Thus, there is a decrease in the durability of the mixture with the duration of the immersion time. This is due to the large number of cavities and pores filled with water, the mixture becomes impermeable or easily damaged.</p> Louise Elizabeth Radjawane Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 101 105 10.21776/ub.rekayasasipil.2023.017.01.14 PENGEMBANGAN PENGEMBANGAN MODEL PERBAIKAN DAN PENINGKATAN KEKUATAN STRUKTUR SAMBUNGAN BALOK-KOLOM PADA BANGUNAN PASCA GEMPA https://rekayasasipil.ub.ac.id/index.php/rs/article/view/1053 <p>This paper presents an experimental study on repairing damaged beam-column reinforced concrete joints using carbon fiber reinforced polymer (CFRP). The test objects were in the shape of the letter T which represented the beam-column connection. The test object came from the previous research which had been failure. The retrofitted action includes strengthening the column position, injection with concrete glue and adding CFRP. Two kinds of CFRP were use, CFRP sheets (EB) and CFRP strips (NSM). The integrity of concrete after injection were tested with Ultrasonic Pulse Velocity (UPV). The retrofitted specimens were tested in loading frame to occurred strength, stiffness and ductility for each kind of retrofitted action. Three kind of tested were held, bending in one direction, shearing in one direction, and quasi cyclic bending. The selection test adjusted to the damage history of specimen.</p> <p> </p> sri murni Dewi Wisnumurti Ari Wibowo Adi Susetyo Dermawan Copyright (c) 2022 Rekayasa Sipil http://creativecommons.org/licenses/by-nc/4.0 2023-01-03 2023-01-03 17 1 106 114 10.21776/ub.rekayasasipil.2023.017.01.15