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Borneo Engineering: Jurnal Teknik Sipil
Published by Universitas Borneo Tarakan
ISSN : 25811134     EISSN : 26857553     DOI : https://doi.org/10.35334/be.v9i3
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Focus and Scope Borneo Engineering : Structural Engineering, Transportation Engineering, Water Resources, Geotechnical Engineering and Construction Management
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 9 Documents
 1 
Search results for , issue "Volume 10 Nomor 1 Tahun 2026" : 9 Documents clear
Analysis of Coastline Changes in West Leihitu District Using Landsat Imagery Pattilouw, Hafiz Syaifudin; Warniyati, Warniyati; Sihombing, Tri O; Tutkey, Monica R
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.482

Abstract

Coastal areas are currently facing serious threats due to changes in the coastline caused by natural factors such as waves, tides, and ocean currents, as well as human activities such as reclamation, coastal development, and mangrove deforestation. Changes in the coastline can have a direct impact on coastal ecosystems and the lives of surrounding communities, especially in areas where economic activity depends on coastal resources. One area experiencing such dynamics is the West Leihitu District in Central Maluku Regency. This study aims to analyze coastline changes in the West Leihitu District during the period 2015 to 2024 using Landsat 9 satellite imagery and the Geographic Information System (GIS)-based Digital Shoreline Analysis System (DSAS) method. The analysis was conducted spatially and temporally to determine the extent of shoreline shifts, both forward and backward. The image data were processed through radiometric and geometric correction, land-sea boundary delineation, shoreline digitization, and inter-year overlay. The Net Shoreline Movement (NSM) and End Point Rate (EPR) methods were used to calculate the distance and rate of shoreline change. The results of the study show that there were varying changes in the coastline in five coastal villages, namely Larike, Wakasihu, Allang, Liliboy, and Hatu. Larike Village experienced the greatest coastline advance with an average change of 7.05 meters and a rate of 0.78 meters/year, followed by Wakasihu Village with an average of 6.69 meters and a rate of 0.74 meters/year. Meanwhile, Allang and Liliboy villages showed a tendency for shoreline retreat, with average changes of 4.25 meters and 0.85 meters, respectively. Hatu village experienced relatively small changes and tended to be stable.
Land Readiness Analysis for Tanah Kuning Port Based on Integrated Topographic Data Utomo, Edy; Bakri, Muhammad Djaya; Nawir, Daud; Arifin, Muhammad Asfihan Nur; Syarif, Iif Ahmad
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.483

Abstract

The coastal area of Tanah Kuning, Bulungan Regency, is planned as part of the development of the Tanah Kuning-Mangkupadi Industrial Estate and International Port (KIPI) in North Kalimantan Province. This study aims to analyze port land readiness based on topographic conditions to inform technical planning for port development. The study offers an approach to evaluating land readiness by integrating terrestrial surveying using a Total Station with aerial photogrammetry using a UAV drone. The data were processed into a Digital Terrain Model (DTM) and contour maps for slope and land elevation analysis. The assessment was conducted descriptively and evaluatively, in accordance with KP.227/DJPL/2019, taking into account slope conditions, protection against the highest high-water level, and existing land use. The results show that location 1 has the most stable conditions, with dominant slopes of 0-25%, elevations above the highest high-water level, and no active settlements. Therefore, it is classified as suitable. In contrast, Locations 2 and 3 are classified as unsuitable due to the dominance of steep to very steep slopes and socio-land constraints.
Application of the Five-Minute Rating Method in Measuring Labor Productivity at a Jakarta Office Tower Project Sari, Dian Perwita; Siregar, Michael Adams
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.524

Abstract

Labor productivity is a critical factor in construction projects, directly influencing the successful achievement of time and cost targets. This study aims to analyze the comparison of labor productivity levels between regular hours and overtime using the Five-Minute Rating method. The research was conducted at an Office Tower Construction Project, employing a descriptive quantitative approach. Data was collected through three days of observation of worker activities, which were classified into effective work, ineffective work, and essential contributory work, using a five-minute observation interval. The results indicate a significant difference in productivity between regular and overtime hours. During regular hours, the average Labor Utilization Rate (LUR) reached 60.8%, with the peak pattern occurring in the morning (LUR 60.8%-71.5%) and a decline in the afternoon and evening. In contrast, during overtime hours, the average LUR was lower at 53.6%, showing a progressively more noticeable declining trend throughout the night shift. The average productivity decrease during overtime was 7.2%, with the highest decline recorded on the third day at 9.6%. Dominant factors contributing to the productivity decline during overtime include cumulative fatigue following the regular shift, suboptimal lighting conditions, and an increased proportion of non-productive contributory activities, which reached 30-40% of total activities.
The Effect of Relative Density of Geosynthetic Encased Stone Columns on the Bearing Capacity and Consolidation of Soft Soil Hayati, Julita; Simamora, Johanes; Sitepu, Arif Rahman Hakim
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.574

Abstract

Building roads on soft soil is a problem that must be faced due to the behavior of soft soil. The low bearing capacity is the primary issue, accompanied by significant settlement due to the soil's high compressibility. Soft soil is present in the Indrapura-Kisaran Toll Road Construction Project, ranging from STA 111+505 to STA 112+300, so reinforcement is necessary. The reinforcement method used is Geosynthetic Encased Stone Columns (GESC). The density of the GESC material used in this method needs to be examined to determine the effectiveness of GESC in reducing settlement and increasing soil-bearing capacity. The analysis process conducted in this study involves analyzing reinforcement using GESC with empirical and numerical methods. This study uses variations in the relative density of the column material at 25%, 50%, 75%, and 100%. After reinforcement, the soil-bearing capacity increased by 280,37 to 361,71%. Additionally, GESC reinforcement was also able to reduce settlement by up to 64,96% using the analytical method and 41,6% using the numerical method, with a consolidation time reduction of 93,38% to 94,52%. The reduction in relative soil density causes settlement to increase by ±7,2% because the friction angle of the column decreases.
Estimation of Passenger Car Equivalent (PCE) Values in Heterogeneous Traffic Using the Time Headway Method on Timor Raya Road, Kupang City Wadu, Amy; Sodanango, Mateus; Dumin, Ludofikus; Laapen, Angelita
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.605

Abstract

Traffic on urban roads in Indonesia is generally heterogeneous, comprising various vehicle types with distinct characteristics. To analyze heterogeneous traffic flow, all vehicles are converted into Light Vehicle Units (PCU), and this concept forms the basis for the definition of Light Vehicle Equivalent (LPE) in various guidelines. However, the standard PCE values from guidelines such as MKJI 1997 and PKJI 2023 can produce inaccurate traffic performance estimates because PCE values are not universal and are highly dependent on traffic conditions, road geometry, and driving culture in a particular region. This study aims to estimate PCE values using the time-headway method on Jalan Raya Timor in Kupang, Indonesia, which has experienced rapid growth in vehicle volumes, especially motorcycles. The time headway method is considered more dynamic and sensitive in reflecting drivers' perceptions of vehicle spacing, thus providing more accurate PCE values than traditional methods. The results of the study show that the PCE value for motorcycles (MC) ranges from 0.64 to 0.98, while for heavy vehicles (HV) it ranges from 1.05 to 2.16. The vehicle headway time method proved to be more accurate in assessing the volume-capacity ratio (V/C) because it is more sensitive to the time interval between vehicles, resulting in a V/C estimate that is closer to field data compared to the standard PCE method from PKJI.
Analysis of the Effect of Silica Fume as an Additive on the Workability and Compressive Strength of Porous Concrete Tri Cahya, Yayan; Usman, Fathoni; Sinta Devi, Debby
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.609

Abstract

The use of porous concrete is a crucial strategy for mitigating surface water runoff in urban areas. However, low compressive strength often poses a major challenge in its application. This study aims to analyze the effect of adding silica fume on the mechanical and hydraulic properties of porous concrete. The research was conducted experimentally in a laboratory setting, following ACI 522R-10 standards for mix proportions and ASTM C39 for compressive strength testing. The silica fume content was varied at 0%, 3%, 5%, and 7% of the total cement weight, with a total of 24 test specimens, each a 10x20 cm cylinder. Test procedures included a slump test for workability, a permeability test, and a 28-day compressive strength test. The results showed that increasing the silica fume content significantly reduced the slump to 0 cm at a 7% increase, indicating that the mixture became stiffer. As the micro-structural density increased, the permeability coefficient decreased from 0.0288 cm/s to 0.0082 cm/s. Although drainage capacity decreased, the compressive strength of the concrete increased significantly by 69.6%, from 6.58 MPa to 11.16 MPa at the 7% content. The novelty of this study lies in identifying the optimal silica fume content to achieve a structural compressive strength above 10 MPa while preserving drainage functionality. These findings confirm that silica fume effectively enhances the mechanical performance and durability of porous concrete, making it highly suitable for use in eco-friendly infrastructure, such as parking lots and neighborhood roads, that require a balance between structural strength and water infiltration efficiency.©The author(s). Published by BEJTSThis is an open-access article distributed under the terms and conditions of the Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA 4.0).Introduction: Pervious concrete is a construction material designed with a high level of porosity, allowing water to flow through its internal cavities. This material is widely used in parking areas, pedestrian paths, and sustainable drainage systems due to its ability to reduce surface runoff and increase groundwater  
Impact of Discharge Fluctuations on River Morphological Changes: A Case Study of the Palu River Sri Warliawati; Darwin Lion; Andi Rusdin; Zeffitni
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.628

Abstract

The Palu River is one of the major rivers in Central Sulawesi that has experienced significant morphological changes due to discharge fluctuations and sediment transport dynamics, particularly in the Kalukubula segment. These morphological changes directly reduce channel conveyance capacity and increase flood risk. This study aims to analyze sediment transport capacity and riverbed elevation changes induced by flow discharge fluctuations, as well as to evaluate the agreement between simulation results and actual field conditions. The research employs a quantitative approach based on one-dimensional numerical modeling using the HEC-RAS software. The data used include river topography surveyed in 2015 as the initial condition, bed sediment characteristics, and river discharge data from 2002–2007. Simulations were performed using the steady flow and sediment transport modules of HEC-RAS to predict riverbed changes for the period 2015–2018, and the results were validated using field measurements conducted in 2018. The simulation results indicate riverbed degradation of 0.08 m at SP.414 and 0.12 m at SP.257, while a relatively minor elevation change of 0.003 m was observed at SP.193. In contrast, field measurements show more pronounced scouring at SP.414 (0.38 m) and SP.257 (0.48 m), as well as sediment deposition of 0.56 m at SP.193. Validation using the Root Mean Square Error (RMSE) method indicates that the HEC-RAS simulation results exhibit a reasonably good level of agreement with field observations, particularly under average discharge conditions. This study demonstrates that flow discharge fluctuations play a critical role in controlling morphological changes in the Palu River, and that HEC-RAS modeling can serve as an effective supporting tool for sediment management and flood risk mitigation.
Fault Structure Analysis Using GGMPlus Satellite Gravity Data in Sumenep Regency, East Java for Disaster Mitigation Azhalia, Neila Ayuzita; Sutasoma, Muwardi; Susilo, Adi; Idmi, Mohammad Habibiy; Wijayanti, Rosita; Boimau, Yanti
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.633

Abstract

Sumenep Regency is an area that has experienced earthquakes with fatalities caused by activity along the Rembang, Madura, Kangean, and Sakala (RMKS) faults. This study aims to identify subsurface structures, particularly faults, in the  Sumenep region using satellite gravity image data downloaded from GGMPlus.   The gravity acceleration data obtained were processed into Complete Bouguer Anomalies (CBAs) and separated into regional and residual anomalies using a Butterworth filter. Then, First Horizontal Derivative (FHD) and Second Vertical Derivative (SVD) analyses were performed to clarify the anomaly boundaries and subsurface structures. Next, 2D geological modeling was performed on the residual anomaly data to determine the types and boundaries between subsurface formation layers.  The results of the study showed significant variations in gravity anomalies, with high contrasts in the southwest and southeast areas, indicating differences in the density of subsurface rocks. FHD and SVD analyses successfully delineated suspected faults, especially in areas with contact layers between low-and high-density rocks. The 2D modeling showed that the contact layer between the Ngrayong-Tawun  Formation and the Ngrayong-Bulu Formation has a weak bond, making it more vulnerable to triggers such as earthquakes.  These results emphasize the importance of further study and disaster mitigation related to active faults in the region. For future research, it is necessary to conduct field surveys and integrate them with other geophysical methods to improve the accuracy of the results.
Feasibility Study of Biomass Fly Ash as a Partial Cement Replacement in Mortar Cured in Seawater Patah, Dahlia; Dasar, Amry; Okviyani, Nur; Apriansyah, Apriansyah; Noor, Nurazuwa Md
Borneo Engineering: Jurnal Teknik Sipil Volume 10 Nomor 1 Tahun 2026
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v10i1.717

Abstract

The high consumption of cement and the limited utilization of biomass combustion residues have highlighted the need for the development of more sustainable cement materials, particularly for construction in coastal areas. While biomass fly ash (BFA) has potential as a cement replacement material, information regarding the use of raw BFA, without pretreatment, in mortar cured in seawater remains limited. This study aims to evaluate the technical feasibility of BFA as a partial cement replacement in mortar, based on compressive strength, ultrasonic pulse velocity (UPV), water absorption, and strength activity index (SAI). BFA was used to replace cement at levels of 10%, 20%, and 30% by weight. Mortar mixtures were prepared with a water-to-cement ratio of 0.40, using tap water for mixing and seawater as the curing medium. Compressive strength was tested at 7, 28, and 91 days, while UPV and water absorption were tested at 28 and 91 days. The SAI values were calculated from the compressive strength results to assess the effectiveness of BFA as a cement replacement material. The results indicated that mortar performance was significantly influenced by the BFA substitution level. The mixture with 10% BFA exhibited the best performance, achieving a compressive strength of 32.62 MPa at 91 days, a UPV value of 3434 m/s, and water absorption of 4.80%. The mixture with 20% BFA still showed reasonably good performance, whereas the 30% BFA mixture led to a noticeable deterioration in mortar quality. The SAI results confirmed that 10% replacement was the most effective level. These findings indicate that raw BFA can be directly utilized as a partial cement replacement in mortar cured in seawater.

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