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All Journal Elkom: Jurnal Elektronika dan Komputer SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Jurnal Teknik Sipil Cendekia (JTSC) Jurnal Nasional Teknik Elektro dan Teknologi Informasi Jurnal Manajemen Informatika & Teknologi Engineering Science Letter Priviet Social Sciences Journal Journal of Innovative and Creativity JMI Jurnal Ekselenta - Jurnal Ilmiah Fakultas Teknik
Rahmat Rahmat
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Sains Indonesia, Bekasi, Jawa Barat 17530, Indonesia
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Journal : engineering science letter

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Analysis of the Effect of Damdex Addition to Concrete Mixture on Compressive Strength Endah Murtiana Sari; Probokusumo; Alfiya Rokhmah; Muhamad Dzaky Ashidqi; Rahmat; Thomas Junaedi
Engineering Science Letter Vol. 4 No. 03 (2025): Engineering Science Letter
Publisher : The Indonesian Institute of Science and Technology Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56741/IISTR.esl.001420

Abstract

This study aims to determine the compressive strength and modulus of elasticity of concrete with the addition of Damdex variables to obtain the best composition. This research method is classified as quantitative research conducted at PT. Fresh Beton Indonesia Batching Plan BSD. In this study, research was conducted using two different concrete mixtures, namely 1 Pc: 2 S: 3 Gr and 1 Pc: 3 S: 2 Gr, each of which was supplemented with Damdex at concentrations of 0.0%, 0.2%, 0.4%, and 0.6%. According to the study's results, the highest compressive strength and modulus of elasticity were achieved in a concrete mixture of 1 Pc: 2 S: 3 Gr, with a variable addition of Damdex at 0.2%, resulting in a compressive strength of Fc 15.11 MPa and a modulus of elasticity of 18975.061 MPa. Meanwhile, the lowest compressive strength and modulus of elasticity results were obtained in the concrete mixture of 1 Pc: 2 S: 3 Gr with the variable addition of Damdex 0.6%, with a compressive strength of Fc 12.90 MPa and a modulus of elasticity of 17049.89 MPa. In the concrete mixture of 1 Pc: 3 S: 2 Gr, the compressive strength and modulus of elasticity were smaller compared to the concrete mixture of 1 Pc: 2 S: 3 Gr, with the highest results in the variable addition of Damdex 0.2%, with a compressive strength of Fc 9.89 MPa and a modulus of elasticity of 13846.477 MPa. Compressive strength and elastic modulus were measured at 28 days in accordance with SNI 1974:1990/2847 procedures. Among the tested mixtures, the 0.20% Damdex addition achieved the highest average compressive strength and elastic modulus. Within the tested conditions, 0.20% Damdex provided the best average performance; however, further work with larger samples and additional durability metrics is needed to confirm this trend.
A Systematic Approach to Reducing Compressor Downtime by 95.3% Within Six Months Toward Industry 4.0 Implementation Rahmat; Yudha Witanto; Dimas Suryo Ajitomo; Budi Sunarto; Acim Maulana; Pedro da Silva
Engineering Science Letter Vol. 5 No. 02 (2026): In Press - Engineering Science Letter
Publisher : The Indonesian Institute of Science and Technology Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56741/IISTR.esl.002151

Abstract

Workshop is one of the sections in the company that is tasked with supporting the productivity process, from Welding fabrication work, motor rewinding, machine tool work, to punch procurement (Mold). Supported by various machines used to support the production process, both for punch repair and fabrication. For this reason, the workshop always tries to provide the best, namely by creating improvements to speed up the process of procuring punches, both lower and upper, as well as master motifs and plain, while the improvements made are making improvements in the Compressor area. Thus, this compressor machine is a vital supporter of the machine's running process and product water usage services to achieve the target results of punch repair in the workshop, the purpose of the research is to add an automatic remote control at the nearest location & can be operated with Wi-Fi, create an auto evaporator cleaning program, install a compressor alarm notification, create an auto drain program for the compressor tube, create a safe compressor room. By implementing several improvements, the results were achieved by reducing downtime by 95.3% to 96.7%. Downtime decreased from 2784 minutes per 3 months to 92 minutes per 3 months. The potential profit was Rp 159.962.422 per year. Therefore, the research results can be applied to all workshop and production machines.
Co-Authors Acim Maulana Alfiya Rokhmah Alfiya Rokhmah Budi Sunarto Dean Anggara Putra Dimas Suryo Ajitomo Galih Raspati Hery Sumardiyanto Hery Sumardiyanto Imron, Jefri Ivan Pratama Jefri Imron Jefri Imron Junaedi, Thomas Khairil Munawar Khairil Munawar Laksana, Rifo Nur Laksana Restu Marhaendra Natawibawa Marhaendra Natawibawa Marhanedra Natawibawa Muhamad Dzaky Ashidqi Muhamad Dzaky Ashidqi Muhammad Abi Jaffar Kamilin Muhammad Dzaky Ashidqi Muhammad Madjid Rubai Munawar, Khairil Natawibawa, Marhaendra Nur Fajrin Hanifah Nurohman Pedro Da Silva Probokusumo Probokusumo Probokusumo Probokusumo Probokusumo Probokusumo Probokusumo Putra, Dean Anggara Rifo Nur Laksana Rifo Nur Laksana Rifo Nur Laksana Restu Riki Fajri Maulana Sari, Endah Murtiana Silviana Windasari Sulaiman Sulaiman Sumardiyanto, Hery Thomas Junaedi Udin Sahrudin Wahyu Sutomo Yudha Witanto