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All Journal International Journal of Engineering, Technology and Natural Sciences (IJETS) Indonesian Journal of Computing, Engineering, and Design
Nanang Fatchurrohman
Unknown Affiliation
Arts Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Experimental Study Compressive Strength of Concrete With Palm Shells as a Partial Replacement for Coarse Aggregate Deded Eka Sahputra; Rita Nasmirayanti; Rafki Imani; Nanang Fatchurrohman; Noto Dewantoro
Jurnal Internasional Teknik, Teknologi dan Ilmu Pengetahuan Alam Vol 5 No 2 (2023): International Journal of Engineering, Technology and Natural Sciences
Publisher : Universitas Teknologi Yogyakarta, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46923/ijets.v5i2.280

Abstract

This experimental study aims to evaluate the compressive strength of concrete using palm kernel shells as a substitution for coarse aggregates. The utilization of locally available materials in abundance, such as palm kernel shells, can serve as a sustainable alternative in construction. This research is conducted to measure the influence of palm kernel shell usage on the mechanical properties of concrete, particularly its compressive strength. The research methodology involves the preparation of concrete mixtures with various levels of substitution of coarse aggregates with palm kernel shells. Test specimens were prepared with substitution percentages of 0%, 25%, and 60% with planned ages of 7 days, 21 days, and 28 days. Three cube specimens were cast for each planned age. The test results were used to compare the compressive strength of concrete with and without palm kernel shells and to evaluate the potential of palm kernel shells as a substitute for coarse aggregates in structural concrete applications. The research findings indicate that the highest compressive strength was obtained in the concrete without any palm kernel shell mixture (0%), measuring 379.86 kg/cm2. The highest compressive strength with the substitution of coarse aggregates using palm kernel shells was found in the 25% mixture, with a value of 362.57 kg/cm2, while the lowest percentage was recorded in the 60% mixture, with a value of 270.65 kg/cm2. Palm kernel shells have the potential to be used as a substitute for coarse aggregates in concrete. However, their utilization needs to be carefully analyzed and tailored to the specific conditions and requirements of construction projects. This research provides initial insights into the use of palm kernel shells in concrete and can serve as a foundation for further research in the development of environmentally friendly concrete using sustainable local raw materials
Mechanical Properties of Sustainable Paving Blocks Using Fly Ash and Polypropylene Plastic Waste Sahputra, Deded Eka; Fakhrul Siddiq; Nanang Fatchurrohman
Indonesian Journal of Computing, Engineering, and Design (IJoCED) Vol. 8 No. 1 (2026): IJoCED
Publisher : Faculty of Engineering and Technology, Sampoerna University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35806/ijoced.v8i1.596

Abstract

The increasing generation of industrial and plastic waste has encouraged the development of sustainable construction materials. This study investigates the mechanical properties of zero-cement paving blocks utilizing Polypropylene (PP) plastic waste as the sole binder and fly ash as a sand substitute. A direct thermo-mechanical melting process at 180°C–200°C was employed without the use of water or chemical activators. To ensure sufficient binder volume, the PP ratio was fixed at 4 parts. Specimens were tested for compressive strength and water absorption according to the Indonesian National Standard (SNI 03-0691-1996). The results demonstrated a clear dependency between the filler ratio and mechanical performance; a 25% substitution of sand with fly ash achieved the optimal performance, yielding a maximum compressive strength of 11.59± 0.84 MPa and a remarkably low water absorption rate of 0.75 ± 0.31%, while the lowest water absorption of 0.62 ± 0.07% was achieved by the control mixture. However, increasing the fly ash substitution to 50% resulted in a strength reduction due to the inability of the fixed PP matrix to completely encapsulate the high surface area of the fine fly ash particles. Although classified as Quality D paving blocks, this purely waste-derived composite presents a highly viable, eco-friendly solution specifically targeted for light-duty infrastructure applications, such as pedestrian walkways and city parks.  
Co-Authors Deded Eka Sahputra Fakhrul Siddiq Imani, Rafki Noto Dewantoro Rita Nasmirayanti Sahputra, Deded Eka