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Jurnal Rekayasa Teknik Sipil dan Lingkungan
Published by Universitas Kristen Indonesia
ISSN : 27223442     EISSN : 27220230     DOI : DOI: https://doi.org/10.33541/cen
Core Subject : Science, Social, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Environmental Science Materials Science & Nanotechnology Transportation
Jurnal CENTECH pertama kali diterbitkan pada bulan April 2020 melalui penerbit UKI Press dengan nama Jurnal Rekayasa Teknik Sipil dan Lingkungan CENTECH. Jurnal ini dikelola oleh Program Studi Teknik Sipil UKI yang dimaksudkan untuk mempublikasikan karya-karya penelitian dosen, alumni, dan praktisi serta peneliti di luar UKI. Jurnal ini memuat artikel-artikel penelitian yang berfokus pada bidang Manajemen Konstruksi, Geoteknik, Rekayasa Struktur, Rekayasa Transportasi, Manajemen Sumber Daya Air serta Rekayasa Lingkungan. Jurnal CENTECH diterbitkan secara berkala dua kali dalam setahun, yaitu April dan Oktober, dimana terbitan perdana adalah pada bulan April 2020. Untuk peningkatan kualitas jurnal maka Prodi Teknik Sipil UKI menerbitkan jurnal ini secara online sehingga dapat mengajukan akreditasi jurnal dalam waktu dekat.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 86 Documents
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THE EFFECT OF SEAWATER SOAKING ON THE STABILITY CHARACTERISTICS OF ASPHALT CONCRETE MIXTURES IN THE COASTAL REGION OF PAPUA: PENGARUH RENDAMAN AIR LAUT TERHADAP KARAKTERISTIK STABILITAS CAMPURAN BETON ASPAL DI WILAYAH PESISIR PAPUA Dinda Sekar Selni Prawardani
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 2 (2025): Vol. 6 No. 2 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, OKTOBER 2025,
Publisher : UKI Press

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Abstract

This research analyzes the effect of seawater immersion on the performance of asphalt concrete mixtures, using the "Retained Strength Index" as the primary parameter. The background for this research stems from the real-world condition of roads in coastal areas that are frequently submerged in seawater. Seawater, with its salt content, is a factor that can significantly reduce the durability and service life of pavement layers. The objective of this study is to examine the characteristics of asphalt concrete mixtures after exposure to varying durations of seawater immersion and to compare the results with those of freshwater immersion to observe the differences. The research methodology involves a Marshall Test on mixture samples prepared with an optimum asphalt content. The immersion durations applied were 0, 6, 12, 24, and 48 hours, in both seawater and freshwater media. The parameters comprehensively analyzed include Stability, Flow, Density, Marshall Quotient, and the Retained Strength Index. The test results consistently show that the longer the immersion duration, the more the values for stability, flow, and MQ tend to decrease. Specifically, seawater immersion causes a greater reduction in performance compared to freshwater. This decrease in performance is attributed to the salt (NaCl) content in seawater, which gradually erodes the adhesive bond between the asphalt and the aggregates, thereby reducing the overall cohesion of the mixture. Although the RSI value decreases with longer immersion times, the results show that even after 48 hours of immersion, the mixture still meets the minimum specification limit of the 2018 Bina Marga standard, which is 90%. In conclusion, it can be stated that seawater significantly affects the reduction in the strength of asphalt mixtures.   
UTILIZATION OF CORN COB ASH AGRICULTURAL WASTE TO IMPROVE THE PERFORMANCE OF SELF-COMPECTING CONCRETE (SCC) ON COMPRESSIVE STRENGTH AND FLOWABILITY IN MUARA TAMI DISTRICT, JAYAPURA CITY Harsan Ingot Hasudungan Harsan
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 2 (2025): Vol. 6 No. 2 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, OKTOBER 2025,
Publisher : UKI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/cen.v6i2.7404

Abstract

Utilization of agricultural waste corn cob ash as an admixture or partial cement substitute in self-compecting concrete (SCC) concrete mixtures. Burned corn cobs produce ash with silica content that has the potential as a pozzolan material. This waste is widely produced by farmers in Muara Tami District, Jayapura City, but has not been optimally utilized. This study aims to evaluate the effect of corn cob ash on two main aspects of SCC concrete, namely compressive strength and flowability. The methodology used includes making concrete mixtures with varying levels of corn cob ash of 0%, 5%, 10%, 15%, 20% as a partial cement substitute, followed by laboratory tests on the mechanical properties and workability of the concrete. Based on the test results, it can be concluded that the SCC concrete mixture with the addition of corn stalk ash (ABJ) up to 15% is still classified as normal SCC concrete based on the slump flow test, while the 20% ABJ mixture shows rather stiff properties and is less ideal for use as SCC concrete. The T500 flowability test shows that all mixtures, from 0% ABJ to 20% ABJ, have a spread time that is still within the normal range, namely between 2.5 and 4.9 seconds, thus meeting the flowability criteria for SCC concrete. In terms of compressive strength, the 5% ABJ mixture gives the best results, namely 36.6 MPa at 7 days and 48.9 MPa at 28 days, making it the most recommended mixture for use in SCC concrete structures. Conversely, the 20% ABJ mixture shows a significant decrease in compressive strength, making it less suitable for structural applications. Keywords: Self-compacting concrete (SCC); Corncob Ash; Slum Flow; Flowability; Compressive Strength
PENGEMBANGAN MATERIAL KONSTRUKSI RAMAH LINGKUNGAN MELALUI SUBSTITUSI PARSIAL SEMEN DAN PASIR DENGAN ABU SEKAM PADI DAN FLY ASH : PENGEMBANGAN MATERIAL KONSTRUKSI RAMAH LINGKUNGAN MELALUI SUBSTITUSI PARSIAL SEMEN DAN PASIR DENGAN ABU SEKAM PADI DAN FLY ASH Irene Vista Simanjuntak; Sudarno P Tampubolon
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 2 (2025): Vol. 6 No. 2 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, OKTOBER 2025,
Publisher : UKI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/cen.v6i2.7538

Abstract

This study aims to develop an environmentally friendly construction material by partially substituting cement and sand with rice husk ash (RHA) and fly ash in pervious concrete. The combination of these two pozzolanic materials is expected to enhance the porosity of the concrete without causing a significant reduction in compressive strength, thereby maintaining its functionality while supporting rainwater conservation in urban areas. The experimental program consisted of a control concrete (without additives) and three modified mixes containing 10%, 15%, and 20% of combined pozzolanic materials (RHA and fly ash) as a partial replacement of the total binder, with a water–cement ratio (w/c) of 0.5 and up to 80% reduction in sand content. The results indicate that increasing the pozzolanic content proportionally increases the porosity and water absorption, from 5.9% in the control mix to 9.8% in the highest variation. Despite the higher porosity, the compressive strength remained within the range of 22–27 MPa, which satisfies the requirements for non-structural concrete. This demonstrates that RHA and fly ash can effectively replace a substantial portion of cement without significantly compromising performance. The pozzolanic reaction between active silica and Ca(OH)₂ generated secondary C–S–H gel formation, which strengthened the microstructure surrounding the pores. Overall, the incorporation of RHA and fly ash in pervious concrete produces a material with a balanced combination of strength, porosity, and environmental sustainability, offering great potential for application in sustainable drainage systems, permeable pavements, and urban green infrastructure. Keywords: Green Concrete; Rice Husk Ash; Fly Ash; Porosity; Compressive Strength; Pozzolanic Reaction; Sustainable Infrastructure.  
STUDI LITERATUR: PERBANDINGAN KINERJA CAMPURAN ASPAL RECLAIMED ASPHALT PAVEMENT DENGAN PENAMBAHAN OLI, MINYAK, DAN PLASTIK Felix Zebua; Ismael Tafonao; Sudarno P Tampubolon; Efendy Tambunan
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 2 (2025): Vol. 6 No. 2 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, OKTOBER 2025,
Publisher : UKI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/cen.v6i2.8045

Abstract

This study is a literature review that compares the performance of recycled asphalt mixture or Reclaimed Asphalt Pavement (RAP) modified with three types of waste materials, namely waste oil, used cooking oil (WCO), and styrofoam plastic waste. An analysis was conducted on 13 scientific journals that discussed the influence of the three materials on technical parameters such as Marshall stability, flow, Marshall Quotient (MQ), and mixed durability. The results of the study show that used cooking oil (WCO) is the most optimal and environmentally friendly feedstock, as it is able to significantly increase the flexibility and durability of the RAP mixture at the ideal level of 3–6%. Used oil is also effective in restoring the aging properties of asphalt, but its use in excess amounts (>10%) can reduce its stability and resistance to water, and requires special handling because it is classified as B3 waste. Meanwhile, plastic waste such as styrofoam, PET, and LDPE are more suitable as additives to improve the structure and reduce the porosity of the mixture, although it does not function as the main contaminant. Of all the types of cooking materials used, used cooking oil (WCO) shows the most consistent performance according to Bina Marga 2010 specifications. Keywords: RAP, used oil, used cooking oil (WCO), styrofoam plastic waste
Palamba, Widsri ANALISIS KINERJA OPERASI MIKROTRANS JAK LINGKO (STUDI KASUS: RUTE GROGOL-MERUYA) Widsri Palamba
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 1 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, April 2025, ISSN 2722-0230 (Online
Publisher : UKI Press

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Abstract

One of the forms of public transportation management in the JakLingko program in the DKI Jakarta region is improving the quality of service and operational efficiency of microtrans. This is necessary due to reports of poor or unpleasant passenger experiences through complaints on social media. These complaints include passenger discomfort, vehicles driving at high speeds, unstable travel times, and other issues. Therefore, research was conducted to maximize the JakLingko microtrans service for the residents of DKI Jakarta. The operational performance analysis is based on operational efficiency, reviewing factors such as vehicle load, fleet availability, average headway, average travel time along the route, and average speed at specific times within the research constraints. The operational performance analysis of JakLingko microtrans will provide information for service improvement planning, which is closely related to passenger safety and security. Data collection was carried out on the Grogol–Meruya route, which is approximately 18.2 km long. This route is located in West Jakarta, with a total of 70 bus stops spread along the transportation route. Minimum service standards can be used to measure the quality of public transportation services, serving as a benchmark for public transportation service guidelines in Indonesia. The reference indicators in this research are based on the Directorate General of Land Transportation in 2002. The results of the transportation performance analysis show a load factor below 70%, specifically 65.01%, an average headway of 3.43 minutes, an average waiting time of 1.72 minutes, an average travel time of 5.21 minutes/km, and an average speed of 11.31 km/h. Overall, there are still several areas that need improvement, such as increasing the efficiency of headway based on studies of uneven passenger distribution and adjusting service frequency to be more regular based on operational hours. Keywords: Performance; operational; microtrans
ANALISIS PERBANDINGAN SIMPANGAN STRUKTUR BAJA PASAR RAKYAT BANYUASRI DI BULELENG PADA MODEL DENGAN DAN TANPA BASEMENT I Made Griadi Dharma Putra; I Putu Ellsa Sarassantika; Kadek Windy Candrayana
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 1 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, April 2025, ISSN 2722-0230 (Online
Publisher : UKI Press

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Abstract

Development in Indonesia is currently experiencing very rapid development, with the development of technology in the construction sector, to meet the aesthetic aspects of buildings and due to limited land, it is planned that building construction will be multi-storey. In the planning and design of multi-storey buildings, the decision to include or not include a basement has significant implications for the structural behavior of the building, particularly in relation to lateral drift and overall stability. Lateral drift, or horizontal shift between levels, is a crucial parameter in ensuring the comfort and structural integrity of buildings when facing lateral loads such as earthquakes. Comparative analysis between these two models is important to understand the influence of the presence of a basement on the dynamic response of a building. The main focus is to evaluate the extent to which the presence of a basement influences the lateral stiffness and dynamic response of the building. Analysis shows that the drift value produced by the model without basement is smaller than the model with basement. Namely, the maximum value for the model without a basement is 17.3 mm and the model with a basement has a maximum value of 29.1 mm with a clearance of 54.6 mm on the 3rd floor in the x direction and in the Y direction. The maximum value for the model without a basement is 25.4 mm and the model with a basement has a maximum value of 43.6 mm with a clearance of 54.6 on the 3rd floor. Based on the results of the analysis that has been carried out, it shows that both models have met the earthquake resistance requirements such as base force. seismic, permissible deviations between floors, capital, and mass inclusions. Keywords: Steel structure; drift; etabs; models without basement; models with basement
Cost Analysis of Project Planning for the G2 Building Structure Construction at Warmadewa University Using the Building Information Modeling (BIM) Method Nodya Dharmastika; Ida Ayu Cri Vinantya Laksmi; Made Mas Surya Wiguna; Putu Gede Suranata
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 1 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, April 2025, ISSN 2722-0230 (Online
Publisher : UKI Press

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Abstract

Cost planning is a crucial aspect of construction project execution to ensure budget efficiency and project success. This study aims to analyze the cost planning for the construction of the G2 Building structure at Warmadewa University using the Building Information Modeling (BIM) method. BIM is employed as the primary tool to generate a 3D model integrated with accurate and efficient cost estimation (quantity take-off). The study begins by collecting initial project design data, technical specifications, and a conventional budget plan (BOQ). Subsequently, this data is implemented in BIM software to create a 3D model of the building structure. This model is used to conduct quantity analysis and cost estimation based on the work volume automatically generated by BIM. The results show that the BIM method produces a cost planning estimate of IDR 13,622,950,957, while the conventional method estimates IDR 14,648,621,255, resulting in a difference of IDR 1,025,670,298 or 7%. Keywords: Building Information Modeling (BIM); cost planning; cost estimation
DETEKSI TUMPAHAN MINYAK MENGGUNAKAN METODE ADAPTIVE THRESHOLD PADA CITRA SATELIT SENTINEL-1A DI PERAIRAN UTARA KARAWANG David Situmorang; Jonson Lumban-Gaol; Efendy Tambunan
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 1 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, April 2025, ISSN 2722-0230 (Online
Publisher : UKI Press

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Abstract

The North Karawang Waters are one of the waters crossed by the Indonesian Archipelago Sea Lane (ALKI) where large ships and tankers cross this water area. In the northern part of the Karawang Waters, there are also oil and gas drilling activities belonging to one of the national oil and gas companies, so there is a high risk of oil spill disasters. On April 22, 2021, there was an underwater oil pipeline leak around the oil well area operated by PT Pertamina Hulu Energi Offshore North West Java (PHE ONWJ). This study aims to analyze the distribution of oil spills using the Sentinel 1A Synthetic Aperture Radar (SAR). The research location includes the Karawang Waters where there has been an oil spill case. The method used to detect oil spills from Sentinel-1A satellite imagery is the adaptive threshold. The stages carried out for satellite image processing are image correction such as radiometric calibration, multilooking, filtering and dark spot detection using an adaptive threshold. Wind direction and speed data are used to see the movement of the oil spill area. The results of the study show that SAR Sentinel 1A imagery provides good enough information to detect oil spills and their distribution in the waters north of Karawang.
ANALISIS PERBANDINGAN STABILITAS LERENG PADA AREA KARST (STUDI KASUS GIRIMULYO, KULON PROGO) Anisa Nur Amalina; Azmi Aufa Ifthikar
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 1 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, April 2025, ISSN 2722-0230 (Online
Publisher : UKI Press

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Abstract

Girimulyo District, Kulon Progo, is famous for its karst landscape, making it one of the tourist destinations. This location is mainly composed of easily soluble rocks such as limestone, dolomite, gypsum, and rock salt, making it very susceptible to landslides, thus requiring a comprehensive slope stability analysis to reduce the risk of landslides that impact residential areas, access roads, and tourist locations. This study evaluated slope stability using the Limit Equilibrium Method (LEM) and the Finite Element Method (FEM). The slope at the research location consists of a layer of silt on the surface and limestone at a depth of 9 meters. Slope modeling was carried out in static and pseudo-static conditions by combining horizontal seismic coefficients derived from SNI 1726 (2019). The results showed that most LEM methods, except the Fellenius method, had higher SF than the FEM method. All methods showed that the slope in the static condition is stable with a safety factor (SF) ≥ 1.25, while in the pseudo-static condition, all methods are considered unstable (SF ≤ 1.07). Among the LEM approaches, the Fellenius (1936) method showed the lowest SF, which is in accordance with previous studies, where this method is the most conservative and suitable for circular slip surfaces only. Meanwhile, the Bishop (1955) and Morgenstern-Price (1965) methods are the most recommended in this study because they accommodate circular and non-circular slip surfaces. The SF results are 2% higher than the FEM results. These results show the importance of choosing the proper analysis method for landslide-prone karst terrain such as Girimulyo. Keywords: FEM; LEM; PLAXIS 2D; slope/W; SF
The OPTIMALISASI KONDUKTIVITAS TERMAL BETON BERPORI MELALUI INOVASI MATERIAL BERBASIS ABU SEKAM PADI DAN SERAT KELAPA SEBAGAI BAHAN TAMBAH RAMAH LINGKUNGAN: Indonesia Irene Vista Simanjuntak; Sudarno P Tampubolon; Pinondang Simanjuntak
Jurnal Rekayasa Teknik Sipil dan Lingkungan - CENTECH Vol. 6 No. 1 (2025): Jurnal Rekayasa Teknik Sipil dan Lingkungan, April 2025, ISSN 2722-0230 (Online
Publisher : UKI Press

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Abstract

The purpose of this study is to increase the thermal conductivity of pervious concrete by adding environmentally friendly supplemental materials, such as coconut fibre and rice husk ash (RHA). The material variations include RHA at 0%, 5%, 10%, and 15% by cement weight and coconut fiber at 0%, 0.5%, and 1% by total mix weight. Five selected combinations were analyzed based on the balance between workability, strength, and thermal performance. Tests conducted include slump (workability), compressive strength (at 28 days), thermal conductivity, water absorption, and freeze-thaw resistance. The results indicate that the addition of RHA and coconut fiber reduces workability but significantly enhances compressive strength and freeze-thaw durability. Thermal conductivity decreased by up to 23% in the mix with 15% RHA and 1% fiber, indicating improved thermal insulation capacity. While water absorption increased with higher fiber content, it was reduced by the presence of RHA. The optimal combination was found in the mix with 10% RHA and 1% coconut fiber, which offered the best balance between mechanical strength, thermal efficiency, and environmental durability. Keywords: Coconut fiber; eco-friendly concrete; pervious concrete; rice husk ash; thermal conductivity  

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