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All Journal Infotekmesin Indonesian Journal of Construction Engineering and Sustainable Development
Yurianto Yurianto
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering

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Identifikasi Faktor-Faktor Yang Mempengaruhi Keterlambatan Proyek Infrastruktur Kereta Cepat Jakarta-Bandung Yurianto Yurianto; Trihono Kadri
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD) Vol. 3 No. 1 (2020): INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CES
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (837.97 KB) | DOI: 10.25105/cesd.v3i1.8022

Abstract

High speed trains are designed with a speed of more than 350 km/ hour. High speed trains in Indonesia were built by PT Kereta Cepat Indonesia China (KCIC). The route served from Halim station in Jakarta to Tegal Luar Sation, which is located in Bandung district, has a length of 142.3 km. The construction of the fast train is divided into 4 (four) sections including sections 1, 2, 3 and 4. This fast train line consists of an elevated, tunnel and subgrade. Some construction works often experience delays due to complexity, land availability, design delays and availability of resources. Implementation time is an important factor in project management besides cost and quality. There are several factors that hinder the completion of the Jakarta-Bandung fast train project, so it is necessary to conduct a study on the inhibiting factors and solutions to minimize delays. The research method used is AHP weighting analysis. Based on the analysis and discussion, it can be concluded that from 61 potential aspects of the cause of the delay, there are 11 variables that affect the implementationtime of the Jakarta-Bandung fast train infrastructure development project based on the AHP ranking, including constraints in land acquisition for infrastructure buildings (63,144%), scheduling very strict projects by owners (61,771%), work order plans that are not well structured / integrated (61,570%), unavailability (materials, tools, labor) as needed (57,216%), shop drawings are not ready on time, no opportunity to learn (56,266%), changes in design / work details during implementation (56,170%), quite complicated project coordination (54,851%), negligence / delay by work sub contractors (53,081%), unclear technical specifications and less firm because it is too general (52,837%), there is a development permit procedure that is dip ery difficult for various parties (50,370%) and unfavorable weather conditions (49,680%)
Peranan Parameter Quench dan Temper Pada Ketangguhan Carbon-Manganese Steel Akhlis Rahman Sari Nurhidayat; Nur Akhlis Sarihidaya Laksana; Yurianto Yurianto
Infotekmesin Vol 14 No 1 (2023): Infotekmesin: Januari, 2023
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v14i1.1566

Abstract

The use of material that is specified as armor steel has a high resistant value. The quenching and tempering process is done to improve the toughness of the material. The process uses a temperature of 900oC on the quenching process with water medium and tempering temperatures of 125oC and 175oC holding time for 30 minutes. The tests include the impact test to determine the increase in the material and fractography to determine the ductility of the material. There is a decrease in the value of the impact that occurs after the quenching process. The impact value is increasing due to the tampering impact of 32 J during the quenching process to 50 J. The fractography shows brittle fractures with ridges as a feature of brittle fractures. Rapid cooling rate processes in the quenching process cause cracks in the quenching specimens.
Co-Authors Akhlis Rahman Sari Nurhidayat Nur Akhlis Sarihidaya Laksana Trihono Kadri