Journal of Applied Civil Engineering and Infrastructure Technology

Rasio Perbandingan Daya Dukung Tiang Pancang Tunggal dari Penyelidikan Tanah Terhadap PDA

Kholidah Ulfi, Dora Melati Nurita Sandi, Eva Olivia Hutasoit — Mon, 03 Mar 2025 00:00:00 +0000

Analisis Pengendalian Mutu Beton Ready Mix Pada Pekerjaan Pile Cap Menggunakan Statistical Quality Methods Control

Eky Yudha Setiawan, Mahdika Putra Nanda, Hamdani Abdulgani — Mon, 03 Mar 2025 00:00:00 +0000

Penelitian ini menganalisis penerapan Statistical Quality Methods Control (SQMC) dalam pengendalian mutu beton ready mix pada pekerjaan pile cap. Tujuan penelitian ini adalah untuk menganalisis kesesuaian mutu beton dari komponen struktur yang digunakan dengan yang direncanakan serta menganalisis faktor-faktor yang mungkin menyebabkan mutu beton sesuai atau tidak dengan rencana. Metode penelitian yaitu dengan pendekatan kuantitatif dengan desain eksperimental. Studi ini akan dilakukan pada proyek Pembangunan Gedung Tower 3 Asrama Haji Indramayu yang menggunakan beton ready mix untuk pekerjaan pile cap. Hasil penelitian menunjukkan bahwa nilai rata-rata slump beton adalah 11,10 cm, yang masih dalam batas spesifikasi 7,5-15 cm untuk pekerjaan plat, kolom, dan balok. Analisis kuat tekan beton pada umur 14 hari menunjukkan semua sampel memenuhi kriteria Oke dengan persentase kekuatan berkisar antara 91,894% hingga 98,276% dari kuat tekan rencana. Peta kendali X dan R untuk hasil uji kuat tekan 14 hari menunjukkan bahwa semua data berada dalam batas kendali, mengindikasikan proses pengecoran yang terkendali dengan baik. Pemilihan pengujian pada umur 14 hari memberikan gambaran yang lebih akurat tentang kekuatan akhir beton, memungkinkan pengambilan keputusan yang lebih baik. Nilai standar deviasi dari hasil kuat lentur yang dikonversi menjadi kuat tekan adalah 0,906, mengindikasikan mutu pelaksanaan yang sangat baik untuk volume pekerjaan >3000 m³. Koefisien variasi sebesar 2,56% menunjukkan kategori pelaksanaan Terbaik. Metode SQMC efektif digunakan untuk pengendalian mutu beton siap pakai yang digunakan pada pekerjaan pile cap, dibuktikan dengan hasil pengujian yang konsisten berada dalam batas kendali.

Pengaruh Proporsi Silica Fume Dengan Penambahan Zat Additive Terhadap Kuat Tekan Mortar

Mon, 03 Mar 2025 00:00:00 +0000

Mortar is commonly used in construction as a strong and durable building mixture that is relatively easy to make. One of the problems that often occurs in Indonesia, especially in buildings located in coastal areas, is the rapid rusting of reinforcement or the degradation of bricks due to not receiving sufficient protection from mortar as the outermost part. Mortar plays a crucial role in construction by acting as an adhesive for bricks, wall plaster, and ceramic tiles, while also providing protection for construction joints. Because of this, the mortar needs to have the maximum strength possible. Adding alternative ingredients, such as silica fume and Superplasticizerconsol SS 74 N, to the mortar is one way to achieve this goal. Different amounts of 0.5% Superplasticizer and 10% and 20% silica fume percentage were added, and compressive strength tests were conducted after 7, 14, and 28 days. The results of the research show that the effect of adding Silica fume and Superplasticizer to mortar has the potential to reduce the compressive strength value, with the maximum compressive strength value for normal mortar aged 28 days being 49.41 Mpa, while for mortar variations of SF 10% and 20% 37.48 Mpa and 30.43 Mpa.

Evaluasi Non-Physical Waste Pada Proyek Pembangunan Gedung Rumah Sakit X Dengan Penerapan Lean Construction

Rasendriya Rizki Danureswara, Suripto — Mon, 03 Mar 2025 00:00:00 +0000

In construction projects, waste encompasses not only material waste (physical waste) but also includes non-value-added activities such as rework, waiting time, and delays (non-physical waste). Construction practitioners often focus on physical waste, neglecting the importance of non-physical waste, which is a critical issue that deserves attention and effective solutions. Therefore, efforts are necessary to minimize non-physical waste by implementing lean construction methods. This study aims to identify critical non-physical waste and its causes, providing recommendations for preventing them through lean construction. The research involved observations, questionnaires, and interviews, with data analyzed using the Borda method. The findings revealed that the critical non-physical waste in the RS X project was waiting, with a weight of 0.204, primarily due to slow approvals, followed by defects with a weight of 0.180, caused by inadequate supervision. To address waiting, it is recommended to apply the Lean principles of Specify Value and Value Stream Mapping, along with tools like the Last Planner System and Daily Huddle Meetings. For defects, the Value Stream Mapping and Flow approaches, supported by tools such as Fail-Safe for Quality and First-Run Studies, are suggested. While not yet fully optimized, the use of lean construction tools positively impacts the reduction of non-physical waste, thereby enhancing project efficiency and quality.

Modifikasi Sudut Masuk Impeller Pompa Sentrifugal Untuk Mengurangi Efek Kavitasi

Nu Rhahida Arini, Desy Ramadhani, Lohdy Diana, Reihan Rizky Reivanda — Mon, 03 Mar 2025 00:00:00 +0000

A centrifugal pump utilizes pressure energy, which is generated by the kinetic energy of involute impeller rotation. A common issue in pump operation is cavitation, a physical phenomenon that occurs when the static pressure of the fluid drops below its saturation pressure, causing the fluid to boil. This phenomenon affects the pump, leading to problems such as shockwaves and erosion, which must be minimized. This research aimed to investigate the influence of pump impeller modifications in reducing the cavitation effect using the computational fluid dynamics (CFD) method. The modifications focused on adjusting the inlet and outlet angles of the pump impeller. A 3D CFD model was developed using OpenFOAM, a CFD software tool, and the cavitation number (Ca) was used as the primary parameter to measure cavitation levels. Additionally, Ca was compared to a reference cavitation number, calculated based on the saturated pressure, while cavitation points at the impeller inlet and outlet were visualized using Paraview software. The results showed that a pump impeller with a blade inlet angle (β₁) of 21,69° resulted in 39.157 cavitation points, whereas modifying β₁ to 38,66° reduced the cavitation points to 32.778, thus decreasing the cavitation points by 6.379. This confirmed that modifying β₁ significantly reduces the cavitation effect.

Analysis of Factors Influencing Contractor Performance in Supporting Infrastructure Sovereignty in North Sulawesi

Mon, 03 Mar 2025 00:00:00 +0000

This research analyzes the factors influencing contractor performance in supporting infrastructure sovereignty in North Sulawesi. The research method uses a quantitative descriptive approach by collecting primary data through questionnaires and structured interviews with contractors involved in infrastructure projects. A cluster sampling technique was used to select samples from various regions in North Sulawesi. Analysis shows that the main factors influencing contractor performance are the availability of capital, competition from similar projects, and the timeliness of client payments. The availability of adequate capital is considered crucial to ensure the smooth implementation of the project. Intense competition compels contractors to lower prices, impacting profit margins and work quality. Timeliness of payments is essential to maintain the contractor's cash flow and financial stability. Other factors, such as changes in government regulations and licensing bureaucracy, also influence performance, but with more variable effects. This research provides recommendations for contractors to strengthen financial management, adapt to competitive pressures, and improve collaboration with stakeholders to ensure the success of infrastructure projects.

Pengaruh Kombinasi Dua Aditif Terhadap Penundaan Waktu Pemadatan Pada Beton

Indriyani Puluhulawa, Muhammad Idham — Mon, 03 Mar 2025 00:00:00 +0000

The decrease in a slump due to the long distance between the batching plant and the casting site is a common issue. This also increases the likelihood of reducing concrete quality due to delays in compaction. To reduce the risks of slump loss and decrease concrete compressive strength, a combination of two admixtures was employed: Sika Plastocrete RT6 Plus, acting as a retarder, and Grolen Hp19R, serving as a superplasticizer. The dosages applied were 0.3% for Sika Plastocrete RT6 Plus and 0.4% for Grolen Hp19R. Compaction delays were tested at 0, 60, 90, and 120-minute intervals. The results demonstrated that combining these two admixtures could enhance the concrete's setting time, slump, and compressive strength compared to normal concrete. However, with the increasing delay in compaction time, there was a noted decrease in the concrete's slump and compressive strength.

Penilaian Efisiensi Aplikasi MPDM Calculator Dalam Pengukuran Produktivitas Method Productivity Delay Model

Redityo Januardi, Julian Pramudhita Dewangga, Muhammad Syaiful Aliim — Mon, 03 Mar 2025 00:00:00 +0000

Technology can assist human needs in various sectors, including the construction sector. Its application has the opportunity to increase technical practicality, time, and cost efficiency, help speed up decision-making, and reduce the risk of errors. One challenge in construction implementation is the inadequate measurement of labor productivity and the lack of well-documented root causes, which can lead to delayed performance improvement decisions and incorrect conclusions. One effective method for productivity analysis is the MPDM (Method Productivity Delay Model), which can measure, predict, and improve productivity by identifying factors that cause delays. Currently, efforts have been made to digitalize part of the productivity measurement process of the MPDM method under the name MPDM Calculator Version 1.0. This application can be used for the data collection and processing stages of the MPDM method productivity calculation and is considered effective based on the same results as conventional methods. This study aims to determine and assess the efficiency of using the application in the process of calculating the productivity of the MPDM method. The results show that this application shortens the productivity measurement process significantly, where the test results for 2 case studies, obtained efficiency values of 153.2% and 156.1%. This application has the potential to be developed again in the process of analyzing productivity and recommending performance improvements to increase productivity. It is hoped that this application can answer the problem of using the MPDM method as one of the construction project control instruments.

Implementasi BIM pada Struktur Gedung Laboratorium Terpadu Universitas Samudra Menggunakan Software Revit

Ahmad Anwar, Wan Alamsyah, Meilandy Purwandito — Mon, 03 Mar 2025 00:00:00 +0000

This research applied three working methods, namely 3D modeling, quantity take-off (QTO), and bar bending schedule (BBS). The main objective of this research was to compare the calculation results of the conventional method with the Building Information Modeling (BIM) method in the construction of the Samudra University Integrated Laboratory Building. The implementation of BIM showed significant differences compared to the conventional approach, especially in 3D visual output and cost estimation (5D). The application of BIM facilitated more accurate 3D modeling and faster and more efficient cost estimation. In addition, BIM also improved the construction inspection process as it allowed the checking of work items without the need for manual inspection one by one. The QTO results using BIM (Revit Student Version) show a difference in calculation volume compared to the conventional method. In the concrete work, there had been a difference of 23.27 m³ or 2.08%, while in the screw reinforcement work, there had been a difference of 9,597.69 kg or 10.33%. For plain reinforcement, there had been a difference of 3,497.28 kg or 3.86%, and the total weight of reinforcement had been 13,094.96 kg or 7.14%.

Analisis Laju Sedimen Berdasarkan Data Unsteady Flow Real Time Dengan HEC-RAS di DAS Bomo Banyuwangi

Mon, 03 Mar 2025 00:00:00 +0000

The 2018 flash flood in Banyuwangi Regency highlighted the role of sedimentation in increasing disaster risks. This study aims to analyze sedimentation rates based on real-time unsteady flow data during the rainy and dry seasons, understand the relationship between unsteady flow and sedimentation, and evaluate the role of HEC-RAS in mitigating sedimentation-related risks. Hydrometric measurements were conducted in real-time over seven days in both seasons. Data were analyzed using HEC-RAS and validated using the Mean Absolute Error (MAE) method of bathymetric measurements. The results show that sedimentation rates were higher during the rainy season (2.77 m³/day) compared to the dry season (1.33 m³/day) due to increased discharge and flow velocity. Flow velocity correlates more strongly with sedimentation than discharge, with regression values of 0.8257 in the dry season and 0.4072 in the rainy season. Flood modeling with HEC-RAS indicates that sedimentation increases flood risks, particularly in downstream areas. Therefore, mitigation measures such as river normalization, embankment construction, drainage optimization, and upstream soil conservation are necessary. These findings also support early warning systems to enhance community preparedness for sedimentation-induced floods.