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All Journal International Journal Of Science, Technology & Management (IJSTM) Journal Of World Science Makara Journal of Technology J-Sil (Jurnal Teknik Sipil dan Lingkungan)
Bastian Okto Bangkit Sentosa
Universitas Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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Risk Identification And Analysis In Engineering, Procurement, And Construction (EPC) Projects At Mining Facilities By PT. XYZ Syakieb Alkatiri, Mushab; Sagita Riantini, Leni; Okto Bangkit Sentosa, Bastian
International Journal of Science, Technology & Management Vol. 6 No. 4 (2025): July 2025
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v6i4.1323

Abstract

Risk management in Engineering, Procurement, and Construction (EPC) projects within the mining sector is critical to ensure project success and avoid potential disruptions. PT. XYZ, a company engaged in mining infrastructure development, faces a variety of risks ranging from technical and logistical challenges to external and environmental uncertainties. This study aims to identify and analyze the risks present in EPC projects carried out by PT. XYZ. The research begins with risk identification through expert interviews and document analysis, followed by a qualitative risk analysis based on the Project Management Body of Knowledge (PMBOK) framework to assess the probability and impact of each risk. The findings reveal several high-priority risk factors that require focused attention in future project planning. This study is expected to provide valuable insights into risk conditions in EPC projects and contribute to better risk-informed decision-making processes for PT. XYZ.
Crack Propagation Observation Using Digital Image Correlation (DIC) on Oil Palm Shell (OPS) Reinforced Concrete Beam Handika, Nuraziz; Astutiningsih, Sotya; Sentosa, Bastian Okto Bangkit; Gasti, Muhammad Daffa
Jurnal Teknik Sipil dan Lingkungan Vol. 9 No. 1: April 2024
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.9.1.1-10

Abstract

In terms of disaster risk management, crack opening and behaviour of structural elements should be predicted to prevent severe risk after the failure. To do so, structure responses, and crack propagation phenomena of concrete structural elements should be understood. Opening, re-closing, or re-opening of cracks in concrete may occur under some circumstances. Capturing the behaviour along the test, sometimes, becomes a problem. Measurement tools should be detached to prevent damage as the sample reaches failure point. A set of contactless devices, called Digital Image Correlation (DIC), has been developed in the Laboratory of Structural and Material Universitas Indonesia. In this research, experimental on Oil Palm Shell (OPS) concrete beam with 19 MPa of fc’, was conducted under four-point loading in the laboratory. OPS is a solid by-product obtained from palm oil production. This experiment uses a 300 x 15 x 250 cm3 beam under a semi-cyclic loading protocol. Load vs deflection, strain, and cracking behaviour are obtained by using the DIC system as its equipment. The conventional measurement (dial gauge) results were compared to the DIC results. The measurement from both tools has similar values. Also, this DIC system can capture deflection and measure crack opening evolution along the test.
Experimental and Numerical Studies on the Compressive Strength Test of Recycled Aggregate Concrete using Digital Image Correlation Sentosa, Bastian Okto Bangkit; Ferdinand, Joshua; Handika, Nuraziz
Makara Journal of Technology Vol. 28, No. 1
Publisher : UI Scholars Hub

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Abstract

The utilization of recycled aggregate (RA) as substitute of natural aggregate in concrete contributes to the research of sustainable building construction materials. Many applications of RA have been studied worldwide. However, the application of RA with a specific range of strength and specific damage behavior requires further study. This research aims to examine the mechanical characteristics of RA concrete, particularly its load–displacement response and crack pattern, through the experimental and numerical studies of compressive strength test. Laboratory concrete waste from cylindrical sample with 30–35 MPa strength was chosen as RA. The digital image correlation (DIC) method was applied throughout the compressive tests. In the post-processing step of the DIC method, vertical and horizontal displacement and the strains of the observed concrete surface were predicted to detect the crack patterns at the initial and maximum load stages. Numerical modeling was then performed on the same shape by applying the concrete damage model by Mazars. Numerical modeling gives close results to the experimental ones from the initial stage to the maximum load stage. These results can be useful for further studies to improve the accuracy of numerical models for alternative building material, specifically for large structures.
Transforming Adversity into Opportunity: Leveraging Sidoarjo's Volcanic Mud for Civil and Environmental Engineering Amalia Kusuma Dewi; Bastian Okto Bangkit Sentosa; Sandyanto Adityosulindro
Journal of World Science Vol. 4 No. 6 (2025): Journal of World Science
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jws.v4i6.1451

Abstract

The Sidoarjo volcanic mudflow disaster in East Java, which began in 2006, has caused ongoing environmental and socio-economic challenges. However, the volcanic mud’s unique composition, rich in silica (SiO?), alumina (Al?O?), and iron oxide (Fe?O?), presents significant potential for resource recovery. This review utilizes a Systematic Literature Review (SLR) approach, following the PRISMA 2020 guidelines, to analyze 49 relevant publications from 2013 to 2024. The findings indicate that treated Sidoarjo mud can be effectively utilized in various civil engineering applications, including ceramic tiles, concrete bricks, geopolymer binders, and road base stabilizers, fulfilling national performance standards while contributing to reduced carbon emissions and construction costs. Moreover, Sidoarjo mud demonstrates its value in environmental engineering, showing effectiveness as an adsorbent for heavy metals, dyes, and organic pollutants in water treatment, as well as serving as a catalyst support in biodiesel production. This review underscores the multidisciplinary value of Sidoarjo mud, positioning it as a key material in advancing circular economy practices and promoting environmentally sustainable innovations within the built environment.
Co-Authors Adityosulindro, Sandyanto Amalia Kusuma Dewi Ferdinand, Joshua Gasti, Muhammad Daffa Handika, Nuraziz Leni Sagita Riantini Sotya Astutiningsih Syakieb Alkatiri, Mushab