Jurnal Teknik Sipil Terapan

Analisis Pengaruh Kondisi Infrastruktur terhadap Kinerja Pelayanan Angkutan Penyeberangan di Pelabuhan Bolonan

2026-03-28T06:15:32+00:00

This study examines the service performance and infrastructure conditions at the Bolonan Ferry Port, as part of the maritime transportation system that plays a crucial role in supporting connectivity within the archipelago. The main problem is the indication of a discrepancy between the condition of the port infrastructure and minimum service standards, which impacts the quality of service to service users. This study aims to analyze service performance and evaluate infrastructure conditions as a basis for improving transportation services. The method used is a descriptive quantitative approach with primary data collection through observation, questionnaires, interviews, and documentation, as well as secondary data from relevant agencies. Data analysis uses a Service Quality approach that covers five dimensions: safety, security, comfort, ease/affordability, and equality. All research instruments have been tested for validity and reliability and are deemed suitable for further analysis. The results show that service performance is in the fairly good category, with the highest scores for the equality and safety aspects, while the comfort and security aspects received the lowest scores.
This condition is in line with the finding that port infrastructure is still inadequate, especially in waiting room facilities, toilets, lighting, passenger lanes, and security facilities. Thus, it can be concluded that there is a close relationship between infrastructure conditions and service performance, so that infrastructure improvement is an important factor in improving the overall
quality of port services.

Keywords: Sea transportation; Ferry ports; Port infrastructure; Service performance; Service quality.

Analisis Karakteristik dan Distribusi Sedimen Dasar (Bed Load) di Sungai Lesti Menuju Waduk Sengguruh

2026-03-28T06:14:26+00:00

Sedimentation is a major problem in reservoir management because it reduces storage capacity and affects operational performance. One of the main sediment sources comes from Sungai Lesti, which flows into Waduk Sengguruh. This study aims to analyze the characteristics of bed load sediment based on grain size distribution and its implications for sedimentation processes in the reservoir. The research methods included field surveys, sediment sampling using a Helley-Smith Bedload Sampler, and laboratory using sieve analysis methods. The analyzed parameters were D₁₀, D₃₀, D₆₀, uniformity coefficient (Cu), and gradation coefficient (Cc). The results indicate that the sediment is dominated by fine to very fine sand with poorly graded characteristics. The values of Cu and Cc show an increase in grain size variability and a more uneven distribution at locations closer to the reservoir. Differences in sediment characteristics between upstream and downstream areas reflect the occurrence of hydrodynamic sorting due to a decrease in flow velocity. Coarser particles tend to be deposited in the river–reservoir transition zone, while finer particles are transported farther and accumulate within the reservoir body. These conditions indicate more intensive sedimentation processes near the reservoir, which may accelerate siltation and reduce storage capacity in the long term. Therefore, integrated and sustainable sediment management is required to maintain the long-term functionality of the reservoir.

Keywords: bed load, grain size distribution, sedimentation, lesti river, sengguruh dam

Prediksi Masa Layan Beton Bertulang pada Lingkungan Klorida Menggunakan Model Laju Korosi

2026-04-09T06:34:22+00:00

Reinforcement corrosion is one of the primary causes of performance deterioration in reinforced concrete structures exposed to chloride-containing environments. This study aims to analyze the corrosion resistance of metakaolin-based geopolymer mortar and to predict the service life of reinforced concrete structures through the integration of laboratory testing results and analytical approaches. The method employed was an accelerated corrosion experiment using a 5% NaCl solution and a 12 V DC power supply under wet–dry cyclic conditions. The parameters analyzed included corrosion rate, corrosion current density, and percentage of steel weight loss.

The results indicate that geopolymer mortar with the MK-95 composition exhibited the best performance, showing lower corrosion rate and corrosion current density compared to normal mortar (MN) and MK-100. Service life prediction was conducted by integrating the corrosion rate model with a chloride diffusion approach based on Tuutti’s concept. The results show that the estimated service life is 38 years for MN, 30 years for MK-100, and up to 153 years for MK-95.

Furthermore, the analysis of concrete cover thickness demonstrates that the use of geopolymer mortar enables the achievement of longer service life with more efficient cover thickness that still falls within standard design requirements. Therefore, the use of metakaolin-based geopolymer mortar, particularly at the optimum composition, is proven to be effective in enhancing the durability of reinforced concrete structures in corrosive environments.

Keywords—reinforced concrete, corrosion, metakaolin, geopolymer mortar, service life