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INDONESIA
MEDIA KOMUNIKASI TEKNIK SIPIL
Published by Universitas Diponegoro
ISSN : 08541809     EISSN : 25496778     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Media Komunikasi Teknik Sipil (ISSN 0854-1809) published twice in a year, in July and December. The article can be product of researches, scientific thoughts or case study, in civil engineering and isn’t formed by politics, commercialism, and subjectivity unsure. This scientific journal contains articles of thought and research results in Civil Engineering that have never been published in scientific journals or other media.
Arjuna Subject : -
Articles 489 Documents
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Studi Perbandingan Kapasitas Aliran & Resiko Banjir Sungai Wulan Dengan dan Tanpa Sistem Pembagi Debit Zoggy Ardi Eka Saputra; Henny Pratiwi Adi; Slamet Imam Wahyudi
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 32, Nomor 1 (2026)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v32i1.70889

Abstract

Demak Regency frequently experiences flooding during the rainy season due to the limited capacity of the Wulan River to accommodate high water discharge. This study aims to evaluate the river's capacity to handle flood discharge and identify critical points. The research utilizes hydraulic modeling with HEC-RAS software, using geometric data collected along an 11.95 km stretch from Wilalung Sluice Gate to Tanggulangin Bridge. The area is divided into three segments: the main Segmen, Wilalung Segmen, and left Segmen. A flood discharge of 1,100 m³/s is used as the primary scenario, while a diversion simulation to the Juana River, reducing the discharge to 700 m³/s, is also conducted. Results show that at 1,100 m³/s, several stations (STA) indicate significant overflow potential: STA 226 (3,58 m) in the main Segmen, STA 235 (3,58 m) in Wilalung Segmen, and STA 234 (3,57m) in the left Segmen. After diverting the discharge to 700 m³/s, most points remain safe, although STA 234 remains critical at 3,20 m. In conclusion, river normalization and structural measures at critical points are needed to minimize the risk of flooding.
Evaluasi Pola Pelayanan Trunk- Feeder vs Direct Service pada sistem BRT berbasis Connection Search Algorithm Taufiq Suryo Nugroho
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 32, Nomor 1 (2026)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v32i1.71728

Abstract

The Government of Indonesia is currently developing more modern urban transportation systems to address mobility challenges in urban areas. One of the systems being developed is Bus Rapid Transit (BRT). A key challenge in BRT implementation lies in route planning and service operation patterns. This paper evaluates the BRT route planning stage by comparing trunk–feeder and direct service network configurations. For this purpose, a public transport assignment model was developed using the Connection Search Algorithm (CSA) method. The analysis was applied to a BRT planning case study in Batam City using PTV VISUM software. The results indicate that the trunk–feeder system is more suitable for public transport networks with moderate demand levels and service capacity, whereas the direct service system is more appropriate for networks with high demand volumes and service capacities.
Pendekatan Sistem Persamaan Diferensial Dua Tundaan untuk Analisis Dinamik Kemacetan di Persimpangan Lalu Lintas Ahmadi Ahmadi
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 32, Nomor 1 (2026)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v32i1.81268

Abstract

This study aims to analyze the role of congestion distribution and delay time in shaping traffic dynamics and as a basis for policy making. The model built is a mathematical model approach in the form of a two-delay differential equation system (?1 and ?2). Based on this model, we have equilibrium point and basic reproduction number are obtained, and numerical simulations. Furthermore, the basic reproduction number  R0 serves as a threshold indicator that represents the potential for congestion distribution. When ?0 > 1, congestion tends to increase and requires policy intervention, while when ?0 < 1, traffic remains relatively under control. On the other hand, the results of this study support the implementation of threshold-based policies, such as activating traffic engineering before critical conditions are reached. The simulation results show that the first delay time ?1 role a significant role in shaping the dynamics of traffic congestion, which is slower but has the potential to increase due to vehicle buildup, while the second delay time ?2 in the recovery process makes congestion last longer before subsiding. Furthermore, this approach is very important because it allows traffic decision-making based on quantitative indicators, rather than the experience of traffic officers in the field.
Evaluasi Eksperimental Performa Beton Normal dengan Penambahan Retarder dan High-Range Water Reducer pada Kondisi Penundaan Pemadatan Indriyani Puluhulawa; Ananda Nitania; Alamsyah Alamsyah
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 32, Nomor 1 (2026)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v32i1.74423

Abstract

Delays in concrete compaction frequently occur in construction due to transportation, equipment, or site constraints, potentially reducing concrete performance. This study evaluates the effect of a retarder (Sika Plastocrete RT6 Plus) and a high-range water-reducing admixture (HRWR, Grolen HP-19R) on the workability, setting time, and compressive strength of normal concrete subjected to compaction delays of up to 120 min. Four concrete mixtures were investigated: control concrete, concrete with 0.3% retarder, concrete with 0.4% HRWR, and concrete containing a combination of both admixtures. The combined admixture significantly prolonged the initial and final setting times while maintaining workability during delayed compaction. The mixture containing 0.3% retarder and 0.4% HRWR retained a slump above 285 mm and achieved a compressive strength of approximately 32 MPa after 60 min of delay. Although slump remained relatively high after longer delays, compressive strength gradually decreased, indicating that prolonged delay adversely affected hydration efficiency. These findings demonstrate that the optimized combination of retarder and HRWR improves concrete performance under delayed compaction and provides practical guidance for concrete mix design in construction projects requiring extended workability.
Studi Perilaku Lendutan Model Perkerasan Kaku Nailed-slab System dengan Tiang Terluar di Tepi Pelat pada Lempung Lunak Akibat Pembebanan Terpusat Anas Puri; Mohd. Syahminan; Fasckal Willman
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 32, Nomor 1 (2026)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v32i1.65514

Abstract

Perkerasan pelat terpaku merupakan kombinasi pelat perkerasan dan tiang-tiang pendek yang terhubung monolit pada sisi bawah pelat. Tiang-tiang tertanam dalam tanah dasar lunak. Studi sebelumnya menguji model dengan susunan tiang terluar tidak ditempatkan tepat pada tepi pelat. Penelitian ini bertujuan untuk mengkaji perilaku lendutan pelat pada sistem tersebut dengan menempatkan baris tiang terluar persis di tepi pelat. Pengujian model skala 1:5 dilakukan di laboratorium menggunakan tanah lempung sebagai media. Variasi model meliputi penggunaan satu dan dua baris tiang dari beton bertulang. Pembebanan diberikan dalam bentuk beban terpusat, baik secara monotonik maupun repetitif, dengan variasi lokasi pembebanan di tepi, di antara, dan di tengah pelat. Hasil pengujian kemudian dibandingkan dengan penelitian sebelumnya. Hasil penempatan tiang terluar di tepi pelat mampu menurunkan lendutan, yaitu sebesar 61,19% pada ujung pelat dan 53,19% pada bagian tengah. Penurunan lendutan ini disebabkan oleh berfungsinya tiang sebagai elemen angkur yang menahan pelat agar tidak terjungkit serta menjaga kontak antara pelat dan tanah dasar. Dengan kondisi tersebut, dinding pengaku di ujung pelat tidak lagi diperlukan. Selain itu, peningkatan jumlah baris tiang berkontribusi terhadap penurunan lendutan dan peningkatan kekakuan sistem. Namun demikian, perilaku lendutan menunjukkan kecenderungan yang lebih buruk pada pembebanan repetitif dibandingkan monotonik, dengan peningkatan lendutan sebesar 60–72% akibat beban repetitif.
Pengaruh Kepadatan Zona Inti Bendungan Karian Terhadap Tekanan Air Pori pada Tahap Impounding Fauji Rohman; Sri Sangkawati Sachro; Hari Nugroho
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 32, Nomor 1 (2026)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v32i1.79565

Abstract

This study analyzes the relationship between core zone density and pore water pressure development during the initial impoundment phase of the Karian Reservoir in Lebak Regency, Banten. This zoned embankment dam features a vertical clay core compacted using a wet compaction method from elevations +6.90 m to +28.0 m, followed by dry compaction for the overlying layers up to the core crest. Field and laboratory quality control data (September 2018–February 2022) were evaluated alongside piezometer data from four elevations (−8 m, 10 m, 30 m, 45 m) recorded during the impoundment period (October 2023–May 2025). The core material exhibited a water content of 44.0–60.0%, a dry unit weight of 1.025–1.178 t/m³, and a permeability coefficient of 6.05 × 10⁻⁹–3.11 × 10⁻⁹ m/s, demonstrating strong inter-parameter correlations. Analyses of excess pore water pressure (∆U) and the pore pressure ratio (Ru) revealed development patterns consistent with theoretical predictions; Ru values below 0.5 indicated stable conditions free from hydraulic instability. Negative pore pressures at upper elevations (−294 to −441 kPa) indicated incomplete saturation, while an effective filter and drainage system accelerated pore pressure dissipation and maintained the dam's integrity. The study confirms that controlling water content and density through wet compaction is effective in maintaining pore pressure stability within a tropical climate characterized by high rainfall.
Pengaruh Ukuran Butir Maksimum Agregat Halus terhadap Sifat Fisik dan Kekuatan Mortar Geopolimer Yulita Arni Priastiwi; Bobby Rio Indriyantho; Nadhifa Thufailah; Oryza Kartika Putri
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 32, Nomor 1 (2026)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v32i1.78512

Abstract

Good gradation of fine aggregates in mortar serves to maximize density, strength and durability by filling cavities efficiently. This study aims to compare the physical properties and strength of geopolymer mortar with maximum grain size variations. Experimental research by making  a 50´50´50  mm mortar cube  with four variations of the maximum grain size of fine aggregate has been conducted. The constituent of geopolymer mortar consists of fine aggregates in the form of rock ash with different maximum grain sizes of 4.75 mm, 2.36mm, 1.18mm, and 0.075mm, fly ash, white soil, and mixed activators of NaOH 8M and Na2SiO3. The test parameters include porosity, density, absorption and compressive strength coupled with fly ash microstructure, white soil, and geopolymer mortar. The test results showed that geopolymer mortars with larger maximum grains (GT 4.75 and GT 2.36) had a more stable strength rate, although the maximum grain of a 1.18 filter (GT 1.18) produced the highest compressive strength of all variations at any age. GT 4.75 mortar has the best porosity value, but the best density and absorption are found in GT 2.36 mortar and the best compressive strength in GT 1.18 mortar. Uneven mixing of chemical compositions in geopolymer mortar allows the appearance of efflorescence which will lead to a decrease in the quality of the mortar.
Optimasi Debit Banjir Guna Mereduksi Dampak Local Scouring pada Hilir Bendung Karet Sungai Juwana dengan Metode Linear Programming Bagas Yoga Pratama; Ismail Sa&#039;ud; Made Indrayana Supriyatna; Harum Nashikhatul Insani
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 32, Nomor 1 (2026)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v32i1.71791

Abstract

The Juwana Rubber Dam has a water level difference of 2.95 m and a fluctuating spillway discharge, which may cause local scour downstream of the structure. Studies linking discharge variations to local scour at rubber dams, particularly on the Juwana River, remain limited. This study aims to estimate downstream local scour depth for several return periods, compare three empirical methods, and determine the optimum spillway discharge theoretically. Design floods were computed using the Nakayasu Synthetic Unit Hydrograph for return periods of 25, 50, and 100 years (136.73, 148.53, and 156.80 m³/s). Considering downstream flow velocity and hydraulic jump height, scour depth was estimated using the Lacey, Wu, and Veronese methods, and the optimum discharge was determined by linear programming (POM-QM velocity, jump height, and discharge constraints. Scour depth increased with return period in all methods: 5.255–5.500 m (Lacey), 1.876–2.042 m (Wu), and 3.061–3.343 m (Veronese), with optimum discharges of 141.238, 143.144, and 143.430 m³/s, respectively. The methods differ substantially; for the 25-year return period, Wu's scour depth is 64.30% smaller than Lacey's. Among the three methods compared, Wu gives the smallest estimate and Lacey the largest (most conservative). Because this study is not supported by field measurements, the accuracy of each method could not be assessed, and the results should be regarded as an estimated range requiring verification with downstream bathymetric data.
Kajian dan Strategi Mitigasi Sedimentasi di Sungai Unda, Bali, Indonesia I Putu Gustave Suryantara Pariartha; I Gede Arta Wibawa; Luh Putu Puspawati; Mawiti Infantri Yekti
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 32, Nomor 1 (2026)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v32i1.77721

Abstract

The Unda River Basin has experienced substantial degradation due to deforestation, land-use change, landslides, soil erosion, and sediment accumulation within the river and its check dams. Excessive erosion and sedimentation reduce the hydraulic capacity of the river and the effectiveness of sediment-control infrastructure. This study aimed to estimate the potential sediment volume in the Unda River Basin and formulate structural and non-structural mitigation measures. The Universal Soil Loss Equation (USLE) was applied to estimate watershed erosion and the associated sediment volume. The results indicate that most check dams in the basin are heavily filled with sediment. The estimated annual sediment volume is approximately 118,115.70 m³, which may be used as the target volume for annual dredging. Under a five-year maintenance interval, approximately 249,554.37 m³ and 341,024.12 m³ of sediment should be removed from the two uppermost check dams, respectively. Under a ten-year interval, the required dredging volumes from the three uppermost check dams are approximately 249,554.37 m³, 378,787.88 m³, and 552,814.72 m³, respectively. Structural mitigation should therefore prioritize the initial removal of accumulated sediment followed by scheduled dredging to restore and maintain check-dam capacity. Non-structural measures should include regulatory oversight, sediment-removal monitoring, community participation, and village-level management. The findings provide a basis for establishing an integrated and adaptive sediment-management strategy for the Unda River Basin.

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