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All Journal JTTM: Jurnal Terapan Teknik Mesin
Zakir Husin
Universitas Teuku Umar, Indonesia
Aerospace Engineering Control & Systems Engineering Engineering Mechanical Engineering

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Transesterification reaction time impacts on oxidation stability and acid number of biodiesel production from waste cooking oil Randa Pratama; Muhammad Idris; Zakir Husin; Zainal Arif; Iskandar Yakoeb; Supriadi
JTTM : Jurnal Terapan Teknik Mesin Vol 5 No 2 (2024): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Sekolah Tinggi Teknologi Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v5i2.1220

Abstract

The scarcity of fossil fuels, environmental concerns, and the sharp rise in fossil fuel prices have driven scientists to search for alternative fuels. The characteristics of biodiesel have made the quest for high-quality biodiesel production particularly appealing. The use of waste cooking oil is a key component in reducing biodiesel production costs by 60-90%. Researchers have employed various types of transesterification reactions with both homogeneous and heterogeneous catalysts for biodiesel production; in this study, a 0.5% NaOH catalyst is used. The objectives of this study are to produce biodiesel fuel based on waste cooking oil, evaluate the impact of reaction time variation on the oxidation value and acid value of biodiesel produced from waste cooking oil, and statistically test the effects of reaction time on the oxidation value and acid value of biodiesel produced from waste cooking oil using analysis of variance (ANOVA). The optimum yield was obtained at a reaction time of 90 minutes, achieving 97%. The results for acid number and oxidation value for various reaction times complied with ASTM, EN, and SNI standards. Linear regression analysis of ANOVA for the acid number concluded that the P-value t3 is 0.399, which is greater than Alpha = 0.05, indicating that the variation in reaction time does not have a significant effect on the acid number. Linear regression analysis of ANOVA for the oxidation number concluded that the P-value t3 is less than Alpha (0.047 < 0.05), indicating that reaction time has a significant effect on the oxidation number.
Toughness analysis of jute laminate composites as wrapping for cylindrical concrete columns Achmad Jusuf Zulfikar; Yuhazri M.Y.; Siswo Pranoto; Din Aswan A. Ritonga; Zakir Husin
JTTM : Jurnal Terapan Teknik Mesin Vol 6 No 1 (2025): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v6i1.1467

Abstract

This study investigates the potential of laminated jute composites (LJC) as a sustainable reinforcement material for cylindrical concrete columns (CCCs) by analyzing the effects of varying the number of LJC layers on mechanical performance. Concrete, widely used in construction, is limited by its low tensile strength, prompting the need for effective reinforcement methods. While previous research has explored natural and hybrid fiber composites, the specific role of jute laminates in enhancing toughness energy (MTE) and split tensile strength (STS) remains underexplored. Specimens were prepared according to ASTM C496, with up to four LJC layers applied using a vacuum bagging method. Experimental results revealed a significant increase in MTE and STS with additional LJC layers. The four-layer configuration (J4) achieved the highest performance, with an MTE enhancement of 17,800% and an STS improvement of over 300% compared to the control specimen. These findings highlight the synergistic relationship between tensile strength and energy absorption in LJC-reinforced CCCs. The study also identified an optimal layer configuration, emphasizing the need for further exploration of durability and long-term performance. This research establishes LJC as a cost-effective and environmentally friendly material for enhancing the mechanical properties of concrete structures, offering valuable insights into sustainable construction practices.
Co-Authors Achmad Jusuf Zulfikar Din Aswan A. Ritonga Muhammad Idris Randa Pratama Siswo Pranoto Supriadi Yakob Iskandar Yuhazri M.Y. Zainal Arif