Joewono Prasetijo

The research investigates how quartz powder addition affects the physical and mechanical properties of concrete paving blocks made from cement, fine aggregate, water, and coarse aggregate mixtures. Quartz powder was evaluated as a waste material-effective alternative to conventional stone dust, with testing conducted on compressive strength, abrasion resistance, bulk density, absorption, and visual inspection parameters. The findings demonstrate that the optimal 10% quartz powder addition significantly improves paving block properties, achieving Class B according to Indonesian National Standard SNI 03-069, which requires a minimum compressive strength of 17 MPa and designates suitability for pedestrian traffic areas, residential walkways, and light vehicular applications. The enhanced performance is attributed to the high silica content in quartz powder, which strengthens cementitious matrix bonds, while Class B ensures compliance with construction specifications for moderate-stress environments, providing adequate durability and structural performance for typical urban infrastructure applications. This research validates quartz powder as a viable, waste material admixture that maintains required quality standards while potentially reducing manufacturing costs through waste material utilization.

This study examines the risk factors that influence the optimization of risk management strategies in infrastructure projects through a quantitative survey of 31 professionals. The research highlights common risks, including poor planning, financial issues, and changes in client requirements, which significantly impact project schedules and budgets. Risk identification, assessment, and response practices were initially surveyed using a straightforward questionnaire that included rating scale items and space for open-ended comments. The collected data were then analyzed in SPSS, where a correlation was discovered between stakeholder engagement and risk responses. These findings suggest that effective risk management relies on early planning, evidence-based decision-making, and effective coordination. The study bridges theoretical frameworks with practical insights, offering recommendations for enhancing risk management strategies in infrastructure projects.

Intelligent Transportation Systems (ITS) have rapidly evolved as innovative solutions to improve traffic performance while reducing accident rates. This study is a Systematic Literature Review (SLR) aimed at analyzing the impact of ITS technology implementation on traffic improvement, particularly through the application of traffic warning systems and adaptive traffic management. Based on previous studies, traffic warning systems provide real-time information about road conditions and potential hazards, enhancing driver awareness and reducing the risk of accidents. In addition, adaptive traffic management utilizes sensors and optimization algorithms to adjust traffic light cycle times according to vehicle density, resulting in smoother traffic flow and reduced congestion. The findings of this SLR indicate that implementing ITS significantly contributes to lowering accident rates, improving road safety, and enhancing the efficiency of urban transportation networks.

This research explores the prevailing patterns in the re-design of road geometry by employing a Systematic Literature Review (SLR) methodology. A total of 1,000 scholarly articles, spanning the years 2000 to 2025, were collected using Google Scholar using the Publish or Perish software. Through this process, the study uncovers major themes, advancements, and research gaps related to geometric road design. The search utilized keywords such as "Geometric Re-design," "Horizontal Alignment," and "Traffic Flow Efficiency." To analyze and visualize data, VOSviewer was used to illustrate the interconnections between keywords and observe publication trends. The results indicate a notable rise in research publications between 2011 and 2023, with recurring themes such as case studies, road alignment, and safety standing out as primary research interests. Prominent publishers like ProQuest and Elsevier have made substantial contributions, reflecting the international breadth and variety of the studies. This review highlights the essential function of geometric road re-design in enhancing traffic safety, streamlining vehicle movement, and informing future infrastructure development. These insights are particularly beneficial for academics, engineers, and decision-makers aiming to improve the efficiency and effectiveness of transportation networks.

This study aims to conduct bibliometric analysis based on the keyword data mapping process. Using Publish or Perish Harzing 8, a total of 1000 studies from the year 2000 to 2023 were gathered. These are subsequently reduced to 561 studies due to their relevance to the study’s topic. Documents are obtained as journal articles, books, datasets, reports, components, monographs, and references formatted in RIS data. The network and density of the keywords are visualized using VOS Viewer. The outcome indicates that “standards” and “structure” are still trending topics in global discourse. Studies on these keywords have also grown for the last couple of years, with 2019 being the peak, with 55 studies issued. From a total of 561 studies, North America is at the top, with 164 studies; Asia and Europe are second and third, with 112 and 95 studies, respectively; and Africa and Oceania are last, with 11 and 10 studies, respectively. Therefore, this review can serve as a reference point for additional studies.

Road connectivity and accessibility for the community start from the lowest level, namely rural roads. Rural road conditions reflect the condition of infrastructure in rural areas. This study aims to study the characteristics of rural road damage. The location of this study is rural roads in West Java, Indonesia, the case of Majalengka Regency. Data collection was carried out on Jalan Gunung Kuning-Sindang in May 2024. The research method and data processing used the Bina Marga–Indonesia (Directorate General of Highway) standard. The study results show that, in general, the rural roads are still damaged. Most of the damage to these village roads is due to poor road maintenance and water control along the road, especially in mountainous areas. Based on the priority order, a value of 9 was obtained to be included in the periodic maintenance program.

The transportation choices of children commuting to school significantly impact their quality of life and safety. This study focuses on the unique aspect of water transportation, which is prevalent in various regions worldwide. Through a comprehensive analysis of 1000 research papers using Publish or Perish and VOSViewer, we explore the critical factors influencing children’s preferences and experiences with water transport. The findings highlight that understanding these preferences is essential for developing safer and more efficient modes of water-based transportation. By addressing the specific challenges school-aged children face, this research aims to inform the design and implementation of improved water transport solutions, ultimately enhancing their well-being and security. This study underscores the importance of tailored transportation strategies in creating a safer and more supportive environment for children navigating their daily commutes.

The latest technology to support geometric road planning must be implemented properly. Village road design using digital applications is believed to be able to produce the best planning. This paper aims to analyze the geometric planning of village roads using the AutoCAD^® Civil 3D application. The data and planning location is on Village Road in Majalengka Regency, Indonesia. The research method used is to digitize manual planning using the AutoCAD application. The planning standard uses a combination of AASHTO and Indonesia Standard. The study results show that using AutoCAD^® Civil 3D for village road planning provides convenience, speed, and the best planning precision.

This research examines the optimization of Cellular Lightweight Concrete (CLC) panel thickness to balance structural performance with environmental sustainability for construction on soft, peaty terrain in West Kalimantan, Indonesia. Laboratory testing was conducted on precast CLC slab panels (1,600 mm × 600 mm) with thicknesses varying from 70 mm to 130 mm. The panels were fabricated using a mixture of foam agent, cement, water, and sand, resulting in specimens with an average density of 1,287.26 kg/m³, while achieving a compressive strength of 3.42 MPa. The unidirectional slabs with double M5 (wiremesh) reinforcement were tested after a 28-day curing period. Results showed that thicker panels exhibited superior bending load capacity, with L/240 design flexural capacity ranging from 1.61 kN to 6 kN for thicknesses between 70 mm to 130 mm. Analysis determined that panels exceeding 100 mm thickness successfully sustained the design load of 250 kg (25 kN) minimum load for flexural capacity, making them suitable for 1,600 mm spans. The study establishes a minimum thickness threshold that balances minimal material usage with adequate structural performance, offering an environmentally responsible building solution that reduces material consumption, transportation energy requirements, and foundation loads for problematic soil regions.