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All Journal Indonesian Journal of Geography Jurnal Geosains dan Teknologi Jurnal Sains dan Teknologi
Hardiyanto, Dwi Wahyu
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Studi Eksperimental Pengaruh Variasi Parameter Perlakuan Panas terhadap Kekerasan Baja Tulangan Polos BJTP280 Imam Rudi Sugara; Hardiyanto, Dwi Wahyu; Ali, Faizah; Fanani, Elvira Wahyu Arum
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 5 (2025): Oktober 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i5.6485

Abstract

The construction and manufacturing industries require materials with optimal mechanical properties, particularly hardness and toughness. BJTP280 structural steel, classified as low-carbon steel, has the potential to enhance its mechanical properties through heat treatment. This study aims to analyze the effect of variations in austenitizing temperature, holding time, and cooling medium on the hardness and microstructure of the steel. Specimens measuring 10 × 8 mm were heated at temperatures of 750°C, 800°C, and 850°C with holding times of 60, 90, and 120 minutes, followed by cooling in air, oil, and water. Hardness tests were conducted using the Brinell method, while the microstructure was observed with an optical microscope. The results showed that the cooling medium had a significant effect. The highest hardness values were obtained with water quenching at 178 HB, oil quenching at 174 HB, and air cooling at 144 HB. Hardness tended to decrease with increasing holding time due to austenite grain growth. An austenitizing temperature of 800°C produced the optimum condition with the highest hardness value, while 850°C resulted in lower hardness because of excessively coarse grain structures. In conclusion, the best heat treatment was achieved at 800°C, water quenching, and a holding time of 60 minutes.
Analisis Batugamping Sebagai Bahan Baku Semen Di Desa Gombang Kabupaten Gunung Kidul Hardiyanto, Dwi Wahyu; Pandita, Hita
Jurnal Geosains dan Teknologi Vol 8, No 2 (2025)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.8.2.2025.124-130

Abstract

The Wonosari Formation is composed of reef limestone, which possesses excellent qualifications as raw material for cement production. However, the presence of the Gunung Sewu Geopark has limited the permissible mining areas, making it interesting to study its potential not only as cement raw material but also for other products. The quality and quantity levels of the limestone are of significant importance in both scientific and industrial contexts. The genesis of the limestone in the study area consists of muddy allochem limestone and muddy micrite. Porosity tests indicate that the limestone has a generally moderate to good porosity level, ranging from 15% to 20%, with dominant structures of vug and channel types. Chemically, it meets the standard requirements for economically viable cement raw material, with SiO₂, Al₂O₃, Fe₂O₃, MgO, and SO₃ contents below 5%, and CaO content above 50%.
The Knowledge Driven as Fundamental Analysis in The Geothermal Exploration Activity: Dieng Geothermal Field Study Area Hardiyanto, Dwi Wahyu; Setianto, Agung; Harijoko, Agung
Indonesian Journal of Geography Vol 57, No 3 (2025): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.102388

Abstract

Geothermal exploration activities involve a high degree of uncertainty and financial risk, thereby requiring exploration analyses that can support accurate decision-making. This study presents a geothermal exploration method for determining the Geothermal Potential Index (GPI) by integrating surface geological, geophysical, and geochemical data.  The main problem addressed in this study is the testing of a method for conducting geothermal exploration by integrating multiple parameters. Accordingly, this research applies a knowledge-driven approach through the Analytic Hierarchy Process (AHP) to develop a tentative Geothermal Potential Index (GPI) model. The Analytical Hierarchy Process (AHP) serves as a reliable methodological framework for assessing the Geothermal Potential Index by integrating newly obtained and pre-existing data. By incorporating suitability analysis, identifying prospective resources, and formulating geothermal resource criteria, this approach establishes a solid basis for systematic evaluation during the geothermal exploration phase. The tentative model of the geothermal potential index (GPI) for the Dieng volcanic complex has been identified into five zones: Pagerkandang Zone, Siglagah Zone, Pangonan-Merdada Zone, Campursari Zone, and Pakuwaja Zone.
Co-Authors Agung Harijoko Agung Setianto Ali, Faizah Fanani, Elvira Wahyu Arum Hita Pandita, Hita Imam Rudi Sugara