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All Journal Syntax Literate: Jurnal Ilmiah Indonesia Journal of Educational Chemistry (JEC) Jurnal Impresi Indonesia MACHINERY: Jurnal Teknologi Terapan SENTRI: Jurnal Riset Ilmiah
Muhammad Rizki Harahap
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Religion Aerospace Engineering Humanities Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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The Development of Lectora Inspire Learning Media and Its Effect on Student Learning Outcomes Muhammad Rizki Harahap; Albinus Silalahi; Zainuddin Muchtar; Nurfajriani Nurfajriani
Journal of Educational Chemistry (JEC) Vol 4, No 2 (2022)
Publisher : Chemistry Education Department

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jec.2022.4.2.11303

Abstract

This study aimed to determine the needs of learning media in schools, the feasibility of the media created following the National Education Standards Agency (BSNP) criteria, and the effectiveness of the learning media on student learning outcomes. This research employed the ADDIE method (Analysis, Development, Design, Implementation, and Evaluation) involving 30 class X (tenth-grade) students. According to the analysis results of the Lectora Inspire media, the mean score of the content feasibility aspects was 3.88 (highly feasible), and the mean score of the presentation feasibility aspects was 3.89 (highly feasible). Furthermore, the developed media was implemented in the teaching and learning process to determine its effect on student learning outcomes. The test incorporated multiple-choice questions. In the implementation phase, the mean score of the pretest was 46.83, while the mean score of the posttest was 81.66. Afterward, the evaluation stage compared the posttest results and the school's passing grade (81.66 70), revealing that the developed learning media significantly affected student learning outcomes.
Studies On Early Compressive Strength Of ECC Mortar Composed By Rice Husk Ash And Silica Fume Muhammad Rizki Harahap; Muhammad Aswin
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (450.52 KB) | DOI: 10.36418/syntax-literate.v7i10.9684

Abstract

In general, mortars have low characteristics and performance. Mortar technology is constantly evolving for better achievements. Meanwhile, there is a lot of waste or residual production materials that has not been used optimally. Related to that, in this research, the utilization of these waste materials, including silica fume and rice husk ash has been carried out. Cylindrical specimens with a diameter of 100 mm and a height of 200 mm were prepared in 16 variations of mixes proportion, where the addition percentage of silica fume (SF) and rice husk ash (RHA) were 0%, 5%, 10% and 15% respectively by weight of cement. In this study, mechanical properties only considered the early compressive strength at the age of 1 day, while flowability was conducted to check the consistency of the fresh mixes of engineered cementitious composites (ECC) mortar. The test results show that the workability of the ECC mortar is in accordance with the European Federation of National Associations Representing for Concrete (EFNARC) standard. Meanwhile, the optimum compressive strength of ECC mortar at the age of 1 day was achieved in ECC mortar with RHA proportion of 0% and 5% combined by SF of 15%. Higher percentage of RHA or SF, can lead to decrement the early compressive strength of ECC mortar.
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.
Study of The Addition of Palm Shall Ash on Increasing Compressive Strength of Paving Block Rizki Harahap, Muhammad
Jurnal Impresi Indonesia Vol. 4 No. 5 (2025): Indonesian Impression Journal (JII)
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jii.v4i5.6627

Abstract

Increasing development, the demand for building materials such as paving blocks is also increasing. With the many variations offered, the material for making paving blocks is not just a mixture of cement and sand. Crushed stone or gravel or other additives can also be used. In this study, palm shell ash was chosen as an additional material in making paving blocks, in order to increase the compressive strength of the paving blocks. This study was conducted by making 48 test specimens, then testing the compressive strength after the test specimens were soaked according to the predetermined planned age. This study refers to the implementation method of SNI 03-0691-1996 concerning concrete bricks (paving blocks). To obtain the optimal composition, various palm shell ash was added. Compressive strength testing was carried out when the test specimens reached the planned age. The results of the compressive strength test that had been carried out, it was found that the optimal addition of palm shell ash occurred at an addition of 8% at a soaking age of 28 days. So by referring to the regulations, concrete bricks (paving blocks) are included in the class C/IIIa quality category.
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 Albinus Silalahi Dodi Tafrant Ella Sundari Muhammad Aswin Nurfajriani Nurfajriani Rizky Brillian Yuliandi Taufikurahman Zainuddin Muchtar