MUSTEK ANIM HA

Analysis of the Effect of Rumble Strips on Vehicle Speed and Level of Service When Approaching a Hazard Zone on Langko, Mataram City

Khusnul, Titik Wahyuningsih, Ahmad Zarkasi, Nurul Hidayati — Thu, 20 Aug 2026 09:02:11 +0900

The rapid development of Mataram City has increased traffic density, making road safety facilities such as rumble strips necessary to improve driver awareness and safety. This is due to the increase in traffic accidents in Mataram City, which reached 637 cases in 2025. This study aims to determine the effect of rumble strips on vehicle speed and the level of service when entering a hazard zone. The study was conducted over three days: Monday, May 18, 2026; Wednesday, May 20, 2026; and Saturday, May 23, 2026. This study employed a quantitative descriptive method by analyzing data using PKJI 2023 through processing the survey data that had been collected, and the level of effectiveness was determined based on the increase and decrease in the average vehicle speed before and after passing the rumble strips. The results showed that the highest traffic volume occurred on Wednesday, reaching 2,854.20 pcu/h. The average vehicle speed before passing the rumble strips was 32.05 km/h, while the average vehicle speed after passing the rumble strips was 40.10 km/h. Furthermore, the highest level of service result obtained a q/C ratio of 0.61, which is classified as Level C, with the description, “Stable traffic flow, but operating speed begins to be restricted by traffic conditions.” The analysis of the effect of rumble strips on vehicle speed on Langko Road showed a decrease in vehicle speed before passing the rumble strips compared to after passing the rumble strips.

Analysis of the Effect of Substituting Paving Block Waste as Coarse Aggregate on the Compressive Strength of Concrete

Arifah Ainussholihah Ginanjar — Mon, 24 Aug 2026 21:37:39 +0900

Demand for concrete as primary building material has increased in Indonesia alongside the ongoing expansion of infrastructure development, the components of concrete rely on natural resources, specifically natural aggregates, which are a finite resource. Similarly, constructuction waste continues to accumulate, according to Law No. 18 of 2008 on waste Management, 3R (Reduce, Reuse, Recycle). This study aims to evaluate the impact of substituting paving block waste as a coarse aggregate substitute on the compressive strength of concrete with a target of f’c=25 Mpa. Material testing, mix design (variations of 0%, 5%, 10%, 15%, 20%), casting of cylindrical test specimens measuring 150x300 mm, concrete curing, and compressive strength testing at 14 and 28 days were conducted in accordance with SNI. The results showed a decrese in compressive strength at 14 days (with the lowest value of 15.7 Mpa in the 5% variation and the highest result of 24,5 Mpa in 0% variation). There was a significant increase in the value at 28 days, with the 20% substitution reaching 25 Mpa. A 20% substitution of paving block waste yields optimal results for sustainable concrete, reduces hazardous constraction waste such as heavy metals, and open opportunities for environmental friendly application.

Improving Fabric Cutting Efficiency and Quality Through Automation At PT Apparel One Indonesia 3

Fredii Fredii — Wed, 26 Aug 2026 23:21:20 +0900

The manual fabric preparation and cutting process in the pre-production warehouse area of PT Apparel One Indonesia 3 leads to cycle time delays, high defect rates (dirty cuts, slanted cuts, and size discrepancies), and financial losses for the company. This study aims to design, implement, and evaluate the effectiveness of an automated dual-function fabric cutting machine (roll-to-roll and roll-to-sheet) based on digital sensors to replace manual methods in the warehouse area. The research adopts a structured four-stage approach: baseline data collection, root cause analysis using fishbone diagrams, 5 Whys, and a 5W+2H matrix, machine design and implementation, and comparative evaluation (before-after) of operational parameters. Operational trial results over three months (October–December 2025) demonstrate that the automated machine significantly enhanced cutting speed by 125%, increasing from 80 m/hour to 180 m/hour. Furthermore, accumulated fabric defects were drastically reduced by 98.1%, dropping from 126.25 m to only 2.4 m. The implementation of this automation innovation proves successful in achieving cutting size standardization while delivering a positive economic impact with cost savings of IDR 23,277,000 from material waste reduction.