Article Per Year (5 Year)
p-Index From 2021 - 2026
2.63
P-Index
This Author published in this journals
All Journal Rotasi Teknika: Jurnal Sains dan Teknologi Semesta Teknika E-Dimas: Jurnal Pengabdian kepada Masyarakat Emerging Science Journal Civil Engineering Journal Adimas : Jurnal Pengabdian Kepada Masyarakat Mekanika: Majalah Ilmiah Mekanika Jurnal Nasional Teknologi Terapan Abdi Masya Journal of Mechanical Engineering Automotive Experiences METAL : Jurnal Sistem Mekanik dan Termal Jurnal Foundry
Eko Surojo
Universitas Sebelas Maret Surakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

Published : 20 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search
Journal : civil engineering journal

 1 
Effects of Stir Casting Baffles on Hardness and Microstructure: Investigation of Designed Aluminum Composites Eko Surojo; Hammar Ilham Akbar; Dody Ariawan; Aditya Rio Prabowo; Teguh Triyono; Fahmi Imanullah
Civil Engineering Journal Vol 8, No 8 (2022): August
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-08-04

Abstract

The increasing demand for lightweight material specifications has forced researchers to develop lightweight materials that are inexpensive, can be produced on a large scale, and are environmentally friendly. One solution that has been developed is an aluminum composite reinforced with sea sand. Indonesia has the second longest coastline in the world, which means that the country is rich in maritime resources, one of which is sea sand. The ceramic contents of SiO2, SiC, and Al2O3allow sea sand to be used as a reinforcement in aluminum composites for engineering purposes. The most effective manufacturing method of AA6061–sea sand composites is stir casting, but the homogeneity and distribution of particles are the main disadvantages of the stir casting method. Various factors affect particle distribution and homogeneity, one of which is the flow during the stirring process. The increase in turbulent flow in the stirring process affects the homogeneity and distribution of the particles. One way to create a turbulent flow when stirring is to add baffles. This paper examines the effect of adding baffles during the stir casting process on the mechanical properties of AA6061–sea sand composites. The mechanical properties of AA6061–sea sand composites were characterized using the Brinell hardness test according to ASTM E-10. The test results show that the addition of baffles during the stir casting process decreases the hardness of the AA6061–sea sand composites due to the turbulent flow that occurs. This makes the material more porous, which makes the AA6061–sea sand composites less hard. Doi: 10.28991/CEJ-2022-08-08-04 Full Text: PDF
Enhancing AA6061–Bottom Ash Composites: Role of Heat Treatment on Properties and Dimensional Stability Seputro, Harjo; Bintoro, Sefrian R.; Ariawan, Dody; Surojo, Eko; Triyono
Civil Engineering Journal Vol. 11 No. 11 (2025): November
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-11-023

Abstract

Aluminum matrix composites (AMCs) reinforced with industrial by-products have attracted attention as lightweight, sustainable materials, yet most research has focused on fly ash. The higher density of bottom ash compared to fly ash makes bottom ash suitable for use as reinforcement in AMC. This study investigates the combined effect of BA reinforcement (0, 3, and 6 wt%) and T6 heat treatment (aging at 175, 200, and 225 °C) on the microstructure, mechanical performance, thermal expansion, and dimensional stability of AA6061 composites. Mechanical testing, thermomechanical analysis (TMA), and coordinate measuring machine (CMM) evaluations were conducted to establish correlations between microstructure and macroscopic reliability. The results show that aging plays a decisive role in strengthening and stabilizing the alloy. The unreinforced AA6061 achieved peak hardness (69.43 BHN) and tensile strength (274.60 MPa) at 200 °C, but exhibited the largest distortion due to high thermal expansion. BA addition significantly reduced the mean coefficient of thermal expansion, with the 3 wt% BA composite aged at 200 °C demonstrating the most balanced behavior: stable CTE response, minimal distortion (0.1–0.4 mm²), and improved mechanical reliability. In contrast, 6 wt% BA composites, despite their lowest mean CTE (≈25 ppm/K), suffered from local instabilities due to particle agglomeration and porosity, leading to reduced toughness and higher geometric irregularities. Overall, this work highlights the novelty of employing BA as a sustainable reinforcement distinct from fly ash, showing that moderate BA addition coupled with optimized heat treatment can enhance dimensional stability and mechanical performance. The findings provide new insights into the design of cost-effective, environmentally friendly AMCs for structural applications.
Effect of Cu and SiO₂ on a Remelted-Recycled Piston Alloy Under Vertical Centrifugal Casting Conditions Triyono, Teguh; Surojo, Eko; Prabowo, Aditya Rio; Triyono, Triyono; Djordjevic, Branislav; Carvalho, Hermes; Adie, Prayoga Wira; Sholehuddin, Muhammad Ilham
Civil Engineering Journal Vol. 12 No. 1 (2026): January
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2026-012-01-020

Abstract

Functionally graded aluminum matrices produced by means of centrifugal casting offer a route to location-specific properties, yet sustainable feedstocks and dual-density reinforcements are less well explored. In this work, we evaluate vertical centrifugal casting (VCC) of a remelted, recycled piston alloy reinforced with silica (SiO₂) and copper (Cu) particulates selected for their contrasting densities relative to the matrix. Castings were produced at 1000 rpm for 5 minutes using a 500 °C preheated mold and an 800 °C pour temperature. Cu was added at 1–4 wt.% and SiO₂ was added at 0–9 wt.%. Bulk density/porosity measurements, Vickers hardness testing, and optical/SEM microstructural analysis were employed to characterize the resulting gradients. The density increased with the radial distance from the rotation axis, accompanied by a monotonic decrease in porosity, consistent with centrifugal separation. Microstructurally, SiO₂ concentrated toward the inner region near the rotation center; in comparison, Cu was enriched at the outer periphery. Correspondingly, hardness exhibited a spatial gradient: SiO₂-reinforced zones were hardest near the inner region, whereas Cu-rich outer zones were hardest at the external rim. These results demonstrate that VCC of a recycled Al–Si feedstock can be used to reliably tailor its microstructure and properties through density-driven particle segregation, enabling controllable, bidirectional functional grading using environmentally friendly starting materials.
Co-Authors Adie, Prayoga Wira Aditya Rio Prabowo Aditya Rio Prabowo Agiel, Raiddin Muhamad Agus Suprihanto Akbar, Hammar Ilham Anwar Nurharyanto Bambang Kusharjananta Bambang Margono Bintoro, Sefrian R. Cahyo Hadi Wibowo Carvalho, Hermes Chamim, Moch. Didik Djoko Susilo Djordjevic, Branislav Dody Ariawan Fahmi Imanullah Hafidh Rawi Mufti Halim, Dimas Ardiansyah Hammar Ilham Akbar Hammar Ilham Akbar Hanif Rinaldi Harjo Seputro, Harjo Henri Fatih Wibowo Herru Santosa Budiono Ilham Habibi, Ilham Majid, Faishal M. Muhammad Ilham Arbi Atmaja Muhayat, Nurul Nugroho Fajar Wicaksono Nurul Muhayat Pramudi, Ganjar Raharjo, Wijang W. Reza Aldiansyah Fanani Rizal Akhmad Bukhori Rizki Dwi Ardika Saifudin Sholehuddin, Muhammad Ilham Sukmaji Indro cahyono Sukmaji Indro cahyono Sukmaji Indro Cahyono, Sukmaji Indro Sunardi Sunardi Taufik, Ikhwan Teguh Triyono Teguh Triyono Teguh Triyono Teguh Triyono Teguh Triyono Tohid Ghanbari-Ghazijahani Triyono Triyono Triyono Triyono Triyono Triyono Triyono Triyono Triyono Triyono Wibowo Wibowo Yupiter HP Manurung