Konstruksi: Publikasi Ilmu Teknik, Perencanaan Tata Ruang dan Teknik Sipil
Journal Title : Konstruksi: Publikasi Ilmu Teknik, Perencanaan Tata Ruang dan Teknik Sipil Initials : Konstruksi Frequency : Januari, April, Juli dan Oktober Print ISSN : 3031-5069 Online ISSN : 3031-4089 Editor in Chief : Dr. Purwanto, S.T., M.Eng DOI : 10.61132 Publisher : Asosiasi Riset Ilmu Teknik Indonesia Konstruksi: Publikasi Ilmu Teknik, Perencanaan Tata Ruang dan Teknik Sipil. E-ISSN:3031-4089 and P-ISSN: 3031-5069 are journals published by the Asosiasi Riset Ilmu Teknik Indonesia. This journal is a peer-reviewed and open research journal of the Engineering Science Clump. The fields of study in this journal include the sub-groups of Civil Engineering and Spatial Planning, Industrial Engineering, Electrical and Computer Engineering, Earth and Marine Engineering. This journal is published 1 year 4 times (January, April, July and October) Konstruksi: Publikasi Ilmu Teknik, Perencanaan Tata Ruang dan Teknik Sipil published by Asosiasi Riset Ilmu Teknik Indonesia, in collaboration with universities and supported by the Asosiasi Pengelola Jurnal Indonesia. Indexed by : Journal Sponsors and Partners :
Konsep Budaya Lokal pada Redesain Bangunan International Plaza Palembang dengan Studi Komparasi Bangunan Sarinah Jakarta
The central building of the cyber world in the city center plays a significant role in enhancing community activities, providing social space, and contributing to the city's image. As the first shopping center in Palembang City, International Plaza has historical and strategic value in the city's development. However, over time, the attractiveness of International Plaza has decreased significantly. This decline is caused by several factors, such as the development of new, more modern shopping centers and the lack of updates to the building's design elements that can attract visitors. This study aims to analyze the potential for redesigning International Plaza with a local cultural approach. In this redesign concept, the Sarinah Building in Jakarta is used as a comparative study because it has successfully combined modern concepts with the development of traditional elements that reflect local culture. The Sarinah Building, although designed with a modern approach, still maintains cultural values relevant to the surrounding community, thus creating a space that is not only functional but also has visual and emotional appeal for its visitors. The results of the study indicate that with a modern architectural approach that remains based on local culture, International Plaza has the potential to revitalize and attract visitors. The suggested redesign includes changes to the building's facade by adding ornaments typical of Palembang City, such as traditional carvings or motifs that reflect the richness of local culture. These ornaments can be applied using secondary skin techniques to building facades, which not only enhance aesthetics but also serve as sunscreens. Furthermore, zoning and tenant order are crucial for a more organized and comfortable visitor flow. Finally, enhancing the public space at the front of the building with additional public facilities, gardens, and gathering areas can create a more vibrant and enjoyable atmosphere for visitors.
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Literature Review: Pemanfaatan Building Information Modeling (BIM) dalam Konstruksi sebagai Alat Komunikasi dan Kolaborasi dalam Integrated Project Delivery (IPD)
Building Information Modeling (BIM) is a technology increasingly used in the modern construction industry, particularly to improve communication efficiency and collaboration between stakeholders. This technology enables the integration of project data and information into a comprehensive digital model, allowing all involved parties to access, verify, and update information in real time. This study aims to evaluate the strategic role of BIM as a communication medium in the Integrated Project Delivery (IPD) approach, focusing on the planning stage involving the disciplines of architecture, structure, and Mechanical, Electrical, and Plumbing (MEP) systems. The IPD approach emphasizes cross-disciplinary collaboration from the early stages of a project to optimize outcomes, reduce risks, and accelerate completion. The research methods used are literature review and case study analysis of various projects that have implemented BIM within the IPD framework. The data analyzed include the effectiveness of information exchange, inter-team coordination, and early identification of design conflicts. The study results show that BIM significantly improves information transparency among stakeholders, minimizes the risk of miscommunication, and accelerates the decision-making process through accurate and integrated data visualization. BIM models also facilitate the detection of potential conflicts, such as clashes between structural and MEP elements, before entering the physical construction phase, thereby reducing repair costs and delays. Furthermore, the use of BIM in IPD fosters a more collaborative work culture, where architects, engineers, and contractors can work together to solve problems quickly and effectively. Thus, BIM has proven to play a crucial role as a primary communication tool in IPD implementation, while also serving as a crucial foundation for achieving efficient, integrated, and high-quality construction project management.
Analisis Mitigasi Bencana Banjir Akibat Sedimentasi dalam Perubahan Tata Guna Lahan Kawasan Permukiman Sepadan Kali Acai pada Tahun 2014 – 2024
Flooding is a hydrometeorological disaster that frequently occurs in Jayapura City, especially in the catchment areas along the Acai River Basin. One of the main factors causing flooding is increased sedimentation triggered by massive land-use changes. This study aims to analyze the relationship between land conversion, increased sedimentation, and flooding in the catchment areas belonging to the Acai River during the period 2014–2024. The method used is a mixed-method approach that combines quantitative, qualitative, and spatial analysis. Data were collected through satellite image interpretation, field surveys, sedimentation measurements, and interviews with the community and related agencies. Spatial analysis was conducted to identify the dynamics of land-use changes and sedimentation zoning. Meanwhile, hydrological analysis was conducted using the Mononobe method and rational calculations to calculate the maximum flood discharge based on annual rainfall and runoff coefficient. The results of the study indicate that over the past decade there has been an increase in built-up land area of ​​more than 80%, which has resulted in an increase in runoff coefficients from 0.223 in 2014 to 0.370 in 2024. The maximum flood discharge has also increased significantly from 60.56 m³/s to 100.41 m³/s. Furthermore, river sedimentation has also increased drastically, especially in the middle and downstream parts of the watershed. The correlation map shows that areas experiencing significant land use conversion are also locations with high sedimentation levels and recurrent flooding. These findings indicate a strong link between land use conversion and increased flood risk through sedimentation mechanisms that provide river channel capacity. Therefore, an integrated watershed management strategy is needed, including controlling land use conversion and restoring riverbank vegetation to minimize the impact of future flooding.
Analisis Multiplier Effect dan Dampak Ekonomi Objek Wisata Pantai Base-G terhadap Perekonomian Lokal di Jayapura
Base-G Beach is a tourist attraction located in North Jayapura District, Jayapura City, managed by the local community who hold customary land rights. This study aims to assess the economic impact of Base-G Beach using the multiplier effect analysis and to evaluate service quality based on the perceptions of visitors, business actors, and workers using a Likert scale. The assessment of six service aspects revealed that most were rated as very good, except for the availability of toilets and electricity, which still require attention. Regarding the economic impact, the Keynesian Income Multiplier calculation yielded a value of 0.27, indicating that the economic impact of this tourist attraction is still suboptimal. This value is below 1, meaning the tourism sector at Base-G Beach has not yet had a significant influence on the local economy. However, the Income Multiplier Ratios for Type I and Type II were 1.09 and 1.11, respectively, indicating a positive economic connection (≥1) between the tourism sector and the local economy. This suggests that there is potential for greater economic impact if the tourism sector is further developed. Nevertheless, the low Keynesian multiplier value indicates the need to strengthen the link between the tourism sector and the local economy. Therefore, it is recommended that the development of Base-G Beach tourism focus on improving infrastructure, particularly the provision of essential facilities such as toilets and electricity. Additionally, efforts should be made to expand the local economic network directly connected to the tourism sector. Improving service quality and developing infrastructure will help increase the economic impact of the tourist attraction, open new business opportunities, and provide greater benefits to the welfare of the surrounding community of Base-G Beach.
Analisis Beban Lentur dan Daya Serap Air pada Genteng Beton : Literatur Review
Concrete roof tiles are an important material in building construction, particularly for roofing work, due to their advantages in terms of strength, durability, and material availability. This study aims to analyze two main physical characteristics of concrete roof tiles, namely bending load and water absorption, using a literature review approach from various previous studies. Bending load refers to the material's ability to withstand bending forces, while water absorption describes the material's capacity to absorb and store water through its pores. These two properties significantly influence the quality and durability of roof tiles in facing external environmental conditions, especially wet-dry cycles and mechanical loads. The results of the literature review indicate that the use of waste as an aggregate substitute in concrete mixes can significantly improve the performance of concrete roof tiles. For example, research using broken roof tiles and ceramic waste as aggregate substitutes successfully increased flexural strength to a range of 12.5–15.0 MPa. Meanwhile, variations in water absorption were recorded in the range of 4%–8%, depending on the material composition and production method. This proves that the use of recycled materials not only supports sustainability but also improves the mechanical and physical properties of concrete roof tiles. Overall, this study underscores the importance of material innovation in concrete roof tile production, particularly utilizing waste as an alternative aggregate. However, further research is needed to explore the best combination of materials and production techniques for producing high-quality, efficient, and environmentally friendly concrete roof tiles.
Perencanaan Gedung Perkuliahan Lantai Lima Kampus Universitas Dr. Soetomo Menggunakan Stuktur Baja
The rapid advancement of science and technology requires universities to provide safe, comfortable, and representative learning facilities. One such initiative is the construction of a five-story lecture building at Dr. Soetomo University, designed with a steel structure as an alternative to reinforced concrete. Steel was chosen due to its high tensile strength, uniform material properties, lighter weight, ease of installation, and strong resistance to earthquake loads. This study aims to design a five-story lecture building with a steel structure that meets the requirements of strength, stability, and safety in accordance with applicable standards. The method applied is structural planning based on SNI 1729:2020, SNI 1727:2020, and SNI 1726:2019 using the Load and Resistance Factor Design (LRFD) approach. Structural analysis was conducted with SAP2000 version 2014 through three-dimensional modeling that considers geometry, material properties, loading, and placement. The results show that the selected steel profiles for beams, columns, and connections are capable of supporting the combination of dead loads, live loads, and seismic loads with safe performance. The maximum stress remains below the allowable limit, and the deflection values do not exceed the permitted deviation. These findings confirm that steel provides efficiency in dimensions and materials while offering practicality and earthquake resistance, and the design produced can serve as a useful reference for future multi-story building projects in earthquake-prone regions.
Analisis Persepektif Multi-Stakeholder terhadap Pengembangan Taman Kehati Hutan Pelawan dengan Konsep Healing Forest sebagai Inovasi Pariwisata Berkelanjutan
This study aims to analyze the multi-stakeholder perspectives on the development of the Pelawan Forest Biodiversity Park (Taman Kehati Hutan Pelawan) through the healing forest concept as an innovation in sustainable tourism in Central Bangka Regency, Indonesia. A mixed-method approach was employed, combining interviews, observations, and questionnaires involving 45 respondents from local government, tourism managers, communities, and visitors. The findings indicate a high level of understanding and support toward the healing forest concept, with Likert scale scores ranging from 4.1 to 4.4, reflecting strong agreement on the integration of conservation-based and mental-wellness tourism. Environmental comfort and tourist interest in the healing concept emerged as the main factors promoting the site’s development potential. Stakeholder perspectives reveal aligned objectives among the government, community, and tourism actors to establish Pelawan Forest as an environmentally friendly quality tourism destination. This research emphasizes the importance of multi-stakeholder collaboration and sustainable governance to ensure tourism development that provides economic benefits while maintaining ecological balance and enhancing visitors’ mental and physical well-being.
Strategi Mitigasi dan Adaptasi Bencana Banjir di Distrik Nabire Kabupaten Nabire
Nabire Regency, located in Central Papua Province, is among the regions highly vulnerable to flooding due to persistent and intense rainfall throughout the year. Flood disasters generate multifaceted impacts, including economic losses caused by property damage and business disruptions, social issues such as health problems and psychological distress, and environmental degradation in the form of erosion and water pollution. This study aims to formulate mitigation and adaptation strategies for flood disasters by analyzing community perceptions and evaluating existing measures. The research employs the Likert Scale method to assess public perception and the Analytic Hierarchy Process (AHP) approach to determine the most effective strategies for mitigation and adaptation. The findings reveal that the community possesses a solid understanding of flood events and acknowledges the necessity of implementing mitigation and adaptation efforts. The AHP analysis indicates that the Regional Disaster Management Agency (BPBD) plays a crucial role in executing flood management strategies, particularly within the environmental management domain. The primary recommended strategy is environmental planning and management. Through an integrated and sustainable approach, flood risks are expected to be mitigated more effectively, minimizing adverse impacts on both the community and the environment in Nabire Regency.
Plasmodium Falciparum and Plasmodium Vivax Malaria Detection Using Image Processing and Multi-Class CNN Classifier
Millions of people suffer from malaria, one of the most serious parasitic diseases that threatens human life and causes high rates of morbidity and mortality, particularly in tropical and subtropical regions. Traditional diagnostic methods, such as blood smear examination, which can be performed using a microscope, face many challenges due to the inaccuracy of manual analysis and the reliance on individual skills. Therefore, the use of machine learning or deep learning algorithms to automate malaria detection offers promising solutions to improve accuracy, reduce diagnosis time, and enhance scalability. In this paper, a multi-class convolutional neural network (CNN)-based model is designed to classify cells infected with Plasmodium falciparum (P. falciparum) and Plasmodium vivax (P. vivax) and uninfected cells from blood smears, as most severe cases and deaths are caused by P. falciparum and P. vivax. This is achieved by building and training a CNN from scratch, rather than using transfer learning from pre-trained models. The proposed network was trained and tested on the Kaggle dataset, which consists of 27,558 images of infected and uninfected individuals. These images were divided into 13,779 images of uninfected individuals, 6,890 images of individuals with P. falciparum malaria, and 6,889 images of individuals with P. vivax malaria. The images were preprocessed using several operations, including blurring, denoising, and morphological processing. The proposed model achieved the best evaluation accuracy when compared with other deep learning algorithms, with an accuracy rate of 96.5%, a sensitivity rate of 95%, a specificity rate of 97.6%, and an F1-score rate of 96.5%. These results demonstrate the effectiveness of the proposed model as a tool to assist clinicians in malaria diagnosis, reducing reliance on manual analysis.
Redesain Bendung Semat Kali Gawe Kabupaten Jepara 2025
This study evaluates the retrofit design of the Semat weir on the Kali Gawe in Jepara Regency. The retrofit aims to adjust the weir’s hydraulic capacity to accommodate estimated flood discharges while ensuring the structure’s stability under applied loads. In the agricultural context, adequate water availability for irrigation directly affects crop yields; conversely, the rainy season often increases river flow and flood risk. Irrigation structures such as weirs are therefore required to raise river water levels to divert flow into irrigation channels and to regulate water distribution. Flood discharge estimates were derived from precipitation data and watershed (drainage basin) characteristics. Flood hydrograph planning is a critical design step for the weir. Log-Pearson Type III analysis was used to determine probable precipitation values for several recurrence intervals. Those design precipitation values were then converted into design flood discharges using synthetic unit hydrograph methods, specifically the Snyder, Nakayasu, and Gamma HSS approaches. Employing the Gamma synthetic unit hydrograph for the 50-year return period (Q50) produced a design flood discharge of 2,536.52 m³/s for that recurrence interval. Structural stability analyses of the redesigned weir indicate safety factors well above customary thresholds: overturning resistance factor = 11.6 (required ≥ 1.5), sliding resistance factor = 4.80 (required ≥ 2.0), and piping (internal erosion) factor = infinite (required ≥ 4). All evaluated stability parameters therefore satisfy standard safety criteria.
Studi Preferensi Penggunaan Transportasi Online dan Kesiapan Smart Mobility di Distrik Abepura
The rapid growth of online transportation services has significantly transformed urban mobility patterns, including in Abepura District, Jayapura City. This study is grounded in the concept of smart mobility, which emphasizes technological integration, efficiency, and accessibility within the smart city framework. The theoretical foundation draws on consumer preference theory and the Customer Satisfaction Index (CSI) model. A quantitative approach was applied through questionnaires distributed to 100 respondents, supported by secondary data on digital infrastructure and local transport regulations. The analytical methods included conjoint analysis to identify user preferences, CSI analysis to assess smart mobility readiness, and spatial analysis to map infrastructure support. The findings indicate that fare and safety are the most influential attributes shaping user preferences, followed by application usability, transport mode, and travel time. Maxim emerged as the most widely used application, followed by Grab and Gojek. The CSI score reached 77.60%, categorized as “highly ready,” though gaps remain in intermodal integration and waiting time efficiency. Spatial analysis confirmed that the coverage of 16 BTS towers in Abepura adequately supports online transportation operations. In conclusion, online transportation services in Abepura District demonstrate strong readiness to support the implementation of smart mobility, yet further improvements are needed in modal integration and operational efficiency to ensure sustainable and inclusive urban mobility.
Peran Teknologi dalam Meningkatkan Partisipasi Masyarakat di Kawasan Wisata Hutan Sagu, Distrik Sentani, Kabupaten Jayapura
This study aims to examine how technology, particularly social media, plays a role in increasing community participation in the development of the sago forest tourism area in Kampung Sereh, Sentani District, Jayapura Regency. The area holds strong natural and cultural potential, yet its development as a tourist destination remains underutilized. The research adopts a qualitative descriptive approach using interviews, field observations, and document analysis. findings reveal that digital technology-especially social media platform such as Instagram and Facebook-has broadened the reach of tourism promotion. Young people in the community have started to use these platforms to share tourism- related activities and local cultural practices. However, challenges persist, including low digital literacy, limited access to proper devices, and the lack of technical training and assistance. Community participation is evident in various aspects, such as organizing cultural performances, preparing traditional food, and engaging in environmental conservation. This study recommends ongoing digital training and the formation of a community- managed promotional team to support sustainable and inclusive tourism development.
Analisis Pola Persebaran Permukiman Berdasarkan Faktor Penduduk di Kelurahan Wai Mhorock Distrik Abepura
Settlements are an important aspect in regional development, where settlements reflct human activities in fulfilling basic needs for housing. Wai Mhorock Village is one of the administrative villages located in Abepura District, Jayapura City. Based on Regional Regulation No. 18 of 2006 this study aims to analyze and examine the settlement patterns developing in this village and to identify whether population factors are the main influence on settlement distribution, or whether other factors play a role. The research method used is descriptive quantitative. Data collection was carried out through comprehensive field observation, documentation, in-depth interviews and data processing using applications such as ArcGIS, SPSS, or Excel.The results of this study show that the settlement distribution in Wai Mhorock Village is categorized as dispersed. This pattern occurs due to various factors, and based on regression results, it was found that population variables—such as those not yet working and those already employed—significantly influence the Y coefficient. From these findings, it is expected that policies can be formulated to enhance regional development and to address issues within Wai Mhorock Village.
Mengidentifikasi Efektivitas Sistem Saluran Drainase di Distrik Abepura, Jayapura, Papua
Wahno Subdistrict in Abepura District, Jayapura City, faces drainage problems that disrupt the area’s water management function. The varied topography, population growth, and the community’s habit of disposing waste into drainage channels have reduced the system’s capacity and caused frequent waterlogging during rainfall. This study aims to analyze the existing condition of the drainage channels in Wahno and to evaluate their effectiveness in conveying stormwater flow. The research methods include field surveys, channel dimension measurements, capacity calculations, and analysis of the effective volume compared to actual conditions affected by waste and sedimentation. The data were analyzed using quantitative and descriptive approaches to assess the performance level of the drainage system. The results show that most drainage channels in Wahno are not functioning optimally, with an average effectiveness of only 45–60% due to blockages caused by waste and sedimentation. The main factors reducing drainage effectiveness are decreased storage capacity, substandard design, and lack of regular maintenance. It is concluded that improvements to channel capacity, better waste management, and routine maintenance programs are necessary to enhance the drainage system’s effectiveness.
Pengaruh Keberadaan Ruang Terbuka Hijau terhadap Tingkat Karbon Dioksida (Co2) Perkotaan di Kota Jayapura
Green Open Space (GOS) is an essential element in urban spatial planning that functions to maintain air quality and ecosystem balance. This research aims to analyze the influence of GOS on the concentration levels of Carbon Dioxide (CO2​) in the urban area of Jayapura City. The study locations were focused on two areas with distinct characteristics: Jalan Sam Ratulangi, which has high vegetation coverage, and Jalan Percetakan, which is dominated by built-up areas and dense commercial activity. The methods used include spatial analysis utilizing Landsat 8 satellite imagery Band 4 (Red) and Band 5 (NIR) to calculate the NDVI (Normalized Difference Vegetation Index), a vegetation time series analysis from 2019–2024, and direct CO2​ concentration measurements taken at three different times (morning, noon, afternoon). The data was processed using ArcGIS with the Kriging Interpolation method to generate spatial distribution maps of CO2​ in both locations. The results show that Jalan Sam Ratulangi has a GOS area of 6.13 ha (94%), while Jalan Percetakan has only 2.95 ha (31%). This difference significantly impacts CO2​ levels, with an average concentration of 484 ppm at Sam Ratulangi, which is lower than Percetakan's average of 567 ppm. The highest CO2​​ value at Percetakan reached 649 ppm during the afternoon, whereas Sam Ratulangi recorded only 488 ppm. This study proves that the wider and healthier the GOS, the lower the CO2​​ concentration detected. These results demonstrate that vegetation plays a significant role in reducing carbon emissions in urban areas, supporting the crucial role of GOS in maintaining air quality and supporting sustainable urban development in Jayapura City.
Penerapan Konsep Arsitektur Vitruvius dalam Desain Kontemporer Fasad Rumah Tempat Tinggal
Denny's house is one of the houses that uses a minimalist architectural concept. The minimalist concept has become a trend in the world of architecture, because of its simple yet effective concept, minimalist design has become one of the most preferred styles by graphic design professionals, architects, and artists (Aliwafa, 2023). The actualization of the Vitruvius architectural concept is based on Vitruvius's theory of Utility (Function Aspect), Firmitas (Strongness and Structure Aspect), and Venustas (Beauty). By comparing Vitruvius's theory with Henry Wotton's Theory, the aim is to actualize the architectural concept in the contemporary design of Denny's house as well as become a case study that can be accepted by the reader's audience. This case study uses descriptive qualitative techniques of data processing that aim to achieve study results on a comprehensive phenomenon. The application of the Vitruvius architectural concept is the focus of discussion in the contemporary design of the facade of Denny's house which becomes a reference for the discussion to examine with an architectural approach. The house becomes the initial locus of discussion by prioritizing the function of beauty, the function of strength or structure, and the function of venustas or beauty. Vitruvius is a theory used to examine the application of design theory by providing a precedent study of Denny's architectural work, which uses a minimalist functionalist theme. This study examines Vitruvius' theory regarding the relevance of design to Denny's home.
Penerapan Time And Motion Study dalam Upaya Perbaikan Waktu pada Proses Produksi CV. JM PUTRA
This study aims to analyze work time efficiency and determine standard time in the furniture production process at CV. JM Putra using the Time and Motion Study method. The background of this study stems from the problem of low production time efficiency due to suboptimal work methods, ineffective work area layout, and a lack of systematic work time measurement. The research was conducted quantitatively and descriptively through direct observation, interviews, and time measurements using a stopwatch for the table production process, which consisted of five main activities. The results showed that the average total cycle time for one table unit was 347.25 minutes, with the activity of assembling the table frame being the longest activity at 120.13 minutes or about 34.6% of the total working time. After performance assessment and the addition of a 15.5% allowance factor, the standard time was obtained at 129.03 minutes. These results indicate that the activity of assembling the table frame is the most critical point that affects production efficiency. The implications of this study show the importance of improving work methods, area layout, and operator training to increase labor productivity. The application of standard time measurement results can be used as a basis for setting work standards, production capacity planning, and a more objective labor incentive system.
Penerapan Konsep Rumah Tumbuh pada Tata Ruang Rumah Swatantra
The limited urban land in Greater Jakarta demands the emergence of a residential approach that is more adaptive to the growing needs of space. This study examines the application of the concept of a growing house in the residence of Rumah Swatantra by Studio Dasar. The research method uses a qualitative-descriptive approach through literature studies and direct interviews with the designer architects. The results of the study show that the application of modular patterns and concrete hollow infill structure systems provides the flexibility of space growth without the need to dismantle the basic structure. The process of space growth occurred gradually following the development of the family from 2017 to 2024, and showed that the quality of space can still be maintained even though the building is built in stages. These findings confirm that the concept of growing houses can be an alternative strategy for sustainable housing in urban areas that experience limited land. In addition, this study highlights the importance of careful spatial planning from the early stages of development so that spatial expansion can be carried out efficiently, measurably, and in harmony with the needs of residents. This approach not only improves the comfort and functionality of the space, but also minimizes construction waste and future renovation costs.
Penerapan Value Engineering pada Proyek Pembangunan Gedung
In the development of a construction project, cost control is very important in the process of managing project costs. Many problems will be encountered in a construction project such as wasteful use of materials, unskilled labor and late completion of the project. This causes waste of costs that do not match the specified budget. In the construction project of the Rectorate of the Sorong City Health Polytechnic building, a budget of Rp. 36,570,996,788.55 is required. This study aims to make savings on previously planned costs, in addition to knowing the comparison of total project costs after analysis. The method used in this study is the Value Engineering method. The Value Engineering method is a method used to identify and eliminate unnecessary activities or reduce costs without reducing function. There are 4 stages of the work plan in this method, namely: Information Stage, Creative Stage, Analysis Stage, and Recommendation Stage. After conducting the Value Engineering analysis, savings of Rp. 654,875,786.25 or 1.79% of the total project cost were obtained. The analysis was conducted on the two highest-cost work items: wall and floor work. For the wall work, it was recommended that the HPL wall covering be replaced with plasterboard, while for the floor work, it was recommended that the 60x60 granite be replaced with 60x60 ceramic tiles.
Pengaruh Sudut dan Kekasaran Pulley terhadap Torsi Sepeda Motor Matic 108 cm3 Tahun 2011
A decline in performance in automatic motorcycles that have been used for a long time is a common problem caused by wear and tear on the Continuously Variable Transmission (CVT) system. This condition results in a reduction in the clamping force of the V-belt on the pulley, causing slippage and a decrease in transmission capacity. Based on the manufacturer's specifications, the torque is 8.32 Nm at 5500 rpm, while the test results show a torque of 7.41 Nm at 6500 rpm, a decrease of 10.9%. The study aims to analyze the effect of variations in pulley angle and surface roughness on the torque value of a 108 cm³ automatic motorcycle as a method to restore transmission performance without replacing the main components. The pulley angles tested were 14°, 13.8°, and 13.5°, while the surface roughness was varied based on the turning process with cutting inserts having nose radii of 0.2 mm, 0.4 mm, and 0.8 mm. The testing was conducted using a dynamometer at an engine speed range of 6000 – 9000 rpm. The results showed that the combination of a 13.8° pulley angle with a 0.2 mm cutting insert nose radius produced a torque of 7.41 Nm at 6500 rpm, an increase of 8.2% compared to the standard 14.5° configuration, which only produced 6.85 Nm. Modifying the pulley angle and surface roughness was proven to increase the V-belt clamping force, thereby improving transmission performance.
Analisis Kinerja Produksi dan Faktor-Faktor yang Mempengaruhi Produktivitas Tambang Batubara di PT. XYZ
This study aims to analyze production performance and the factors influencing the productivity of mining operations at PT. XYZ during August 2025. The evaluation covers production achievement against the corporate work plan (RKAP) and the owner’s operational plan, equipment availability (Physical Availability), the productivity of loading and hauling units, and various types of loss time that reduce effective working hours. The results indicate that production realization reached only 65% of the RKAP target, while achieving 102% of the owner’s plan for total material. Low equipment availability, high loss time such as no hauler, wait operator, and front preparation, as well as the underperformance of 80-ton and 100-ton units, were identified as the main contributors to production deviation. Additional influencing factors include unit reassignment, suboptimal haul road conditions, and insufficient operational fleet numbers. The study recommends optimizing fleet management, enhancing preventive and predictive maintenance programs, reorganizing hauling workflows, and controlling dominant loss time sources to improve operational efficiency and production target achievement in future periods.
Pengaruh Penambahan ABS Bekas dan Jenis Plastik ABS Hasil Cetak Injeksi terhadap Umur Lelah
Many used ABS plastic wastes have problems in their management. The aim of this research is to obtain a prediction of the fatigue life of a mixture of ABS plastic and used ABS as an injection molding product. The research method is carried out through the stages of mixing used ABS with a volume of 10%, 20%, and 30% in ABS grade A and grade B; making fatigue test specimen molds according to R. R. Moore standards, injection molding of a mixture of used ABS and ABS grade A and grade B, checking the straightness and smoothness of the specimen surface, fatigue testing with increasing serial loads, analysis and making a graph of bending stress (S) against fatigue life (N) (S-N Curve). The results of the study showed that the addition of used ABS had an effect on the fatigue life of both grade A and grade B of ABS, where the fatigue life of grade A of ABS increased with the addition of the volume percentage from 0% -30% of used ABS with the highest value at the addition of 30%, namely 43698.9 cycles, while in grade B of ABS, the fatigue life decreased with the increase in volume from 0% -30% with the highest fatigue life in grade B of ABS plastic without a mixture or 0%, namely 41377.5 cycles, the implication of which is that the addition of 0% -30% of used ABS in grade A can increase the fatigue life, but grade B of ABS actually decreases its fatigue life.
Analisis dan Uji Kekuatan Pukul Komposit Helm Ukuran Dewasa berbasis Ijuk Resin dengan Perendaman Alkali
Indonesia is one of the countries with abundant availability of palm fiber composite, yet its application in advanced material technology remains limited. On the other hand, most motorcycle helmets available in the market are made from ABS plastic, which has limitations in impact energy absorption and may increase the risk of head injuries during accidents. This study aims to develop helmet composites based on palm fiber and epoxy resin by varying the fiber volume fractions (15%, 25%, and 35%) and alkali soaking durations (75, 150, 225, and 300 minutes). The impact strength test results showed that the combination of 35% fiber volume and 225-minute alkali soaking produced the highest specific impact energy (SIP) of 0.142 J/mm&sup2;. As a comparison, SNI-compliant helmets made from ABS plastic only reached an EPS value of 0.00972 J/mm&sup2;, indicating that palm fiber-based composite helmets could improve impact energy absorption efficiency by more than 14 times. The results conclude that increasing the fiber volume fraction and optimizing the alkali treatment duration significantly enhances the impact resistance, making ijuk-based composite helmets a promising alternative for safer and more eco-friendly protective gear.