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All Journal MACHINERY: Jurnal Teknologi Terapan SENTRI: Jurnal Riset Ilmiah
Harahap, Muhammad Rizki
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Aerospace Engineering Humanities Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Energy Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH VARIASI TEKANAN DAN PENAMBAHAN UNSUR MAGNESIUM TERHADAP PENGECORAN ALUMINIUM PADA KOPLING PERAHU MOTOR Harahap, Muhammad Rizki; Rizky Brillian Yuliandi; Taufikurahman; Ella Sundari; Dodi Tafrant
MACHINERY Jurnal Teknologi Terapan Vol. 5 No. 2 (2024): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.12736345

Abstract

The universal joint coupling or U-joint is the part of the motor boat that connects the engine to the propeller shaft. The U-joint of a motor boat made of aluminum often suffers damage such as breaking due to loads when operating. The purpose of this research is to improve the quality of this product with the squeeze casting method with the addition of magnesium 3% and 4% and pressure variations of 70, 85 and 100 MPa for casting universal joint coupling products. The casting process is carried out by melting aluminum and mixing it with magnesium and then pressing it using a hydraulic pressure tool. After the casting process is complete, the specimen is trimmed for hardness testing. The results of the hardness test obtained the highest value on the pressure parameter of 100 MPa. For 4% Al-Mg with an emphasis of 100 MPa, the average hardness value was 94.66 BHN. For Al-Mg 3% with an emphasis of 100 MPa, the average value was 90.06 BHN. While the raw material has a hardness value of 57.52. It can be seen that the hardness value has increased from before. It can be concluded that the squeeze casting casting method and the addition of magnesium can affect the hardness value of aluminum.
The Effect of Lime Addition on the Compressive Strength Improvement of Paving Blocks Write Harahap, Muhammad Rizki
SENTRI: Jurnal Riset Ilmiah Vol. 4 No. 10 (2025): SENTRI : Jurnal Riset Ilmiah, Oktober 2025
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/sentri.v4i10.4810

Abstract

Paving blocks are made by mixing the composition of cement, sand, water and or with other additives, then pressure is applied with a certain intensity. The use of paving blocks is becoming more widespread, causing alternative additives to be sought that can increase compressive strength. Lime is selected as an additional alternative material in the paving block mixture. Lime is relatively easy and cheap because this material is a potential in Indonesia which spreads to various islands, namely in Java, Sumatra and Irian Jaya, so the availability of this material is very much. This study aims to determine the effect of adding lime on the compressive strength of paving blocks. The composition of the mixture in this study is the quality of class D. The compressive strength of this class D is compared to the compressive strength of the paving block with the addition of lime. The percentage of lime addition is 2%, 4%, 6%, 8%, and 10% to the weight of cement. The cement used is PCC (Portland Cement Comcomposite) type and the test specimen is printed in a hexagonal shape using manual tools. The results of laboratory tests obtained that the sand sludge content and grain fineness modulus (MHB) were qualified. The maximum increase in compressive strength occurs with the addition of 8% lime. According to SNI-03-0691-1996, the compressive strength of 8% lime is classified as class C quality. Meanwhile, the addition of 10% lime at the age of 28 days resulted in a decrease of 17% in the compressive strength of the addition of 8% lime.
Co-Authors Dodi Tafrant Ella Sundari Rizky Brillian Yuliandi Taufikurahman