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All Journal Jurnal Mechanical Jurnal Riset Teknologi Pencegahan Pencemaran Industri
Yusup Hendronursito
Research Unit For Mineral Processing
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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SAND CASTING MANUFACTURER WITH MATERIAL ADDITIVE TO PERMEABILITY AND GREEN COMPRESSIVE STRENGTH CHARACTERISTIC Yusup Hendronursito; Muhammad Amin; Kusno Isnugroho; David Candra Birawidha
JURNAL MECHANICAL Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v10.i2.201907

Abstract

Sand casting as a main material in the casting process. To result from the product in good quality sand casting must be standardized such as high-temperature resistance, good permeability to gas flow, high strength to enough to hold the loading press, and high shear strength to accept shear force. This study to aims effect of material added on green sand as sand casting to find the best composition on permeability, green compressive strength, and green shear strength. Glass powder in sample A and feldspar in sample B used to material binder selected an alternative beside bentonite because have high Silica (SiO) and Alumina (Al2O3) to optimizing the sand casting characteristic. The binder material meshing in < 80 Mesh with 10%, 20%, 30%, 40%, and 50% composition respectively with 10% constant addition of water. Every sample three times testing included clay content, Grain Fine Number based on SNI 19-0312-1989 while permeability, green compressive strength, and green shear strength. The result shows the permeability directly proportional with glass powder addition has a maximum of 63.67, while the addition of feldspar affected decrease the permeability value with a minimum of 51.67. The higher green compressive strength obtained from 10% w/t glass powder with value 96.87  kN/m2 inversely proportional with green shear strength with value 76.27 kN/m2 in 10% w/t addition.
Synthesis of Silica Nanoparticle Made from Lampung Pumice Modified with Sonication Parameters for Size and Purity Siti Rahmadianti; Yusup Hendronursito
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 14 (2023): special issue
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2023.v14.no3.p33-40

Abstract

This study aims to determine the effect of sonication process parameters on the formation of the size and purity of silica from the synthesis of pumice. Pumice reflux process using NaOH for 24 hrs. Titrate using 5M H2SO4 solution to pH 7 and a white gel is formed. The residue was washed using distilled water and dried at 100 oC for 24 hrs. The residue was then stirred with 1M HCl solution for 4 hrs. After the synthesis process, the silica powder was then subjected to a sonication process with temperature variations of 30, 60, and 80 oC for 1, 2, and 3 hrs. The purity of silica was evaluated from the results of x-ray fluorescence, x-ray defragment, and SEM test results. The results of the analysis of variance showed that the independent variable temperature contributed 67.25% and had a significant effect on the SiO2 concentration. The two sonication variables, temperature and time, contributed 50.31% and 46.24%, respectively. The variables significant effect on particle size. Other independent variables affect the SiO2 concentration by 10.36%. The sonication process can increassed concentration and reduced particle size of silica synthesized by selecting the appropriate independent variable.
The Effect of Bentonite and Palm Shell Ash on The Mechanical and Physical Properties of Geopolymer Concrete Yusup Hendronursito; Muhammad Amin; Yugo Chambioso; Suharto; Roniyus Marjunus
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 13 No. 2 (2022): November
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2022.v13.no2.p21-27

Abstract

Geopolymer concrete is an alternative to obtaining environmentally friendly mortar by synthesizing materials that contain a lot of aluminum silicate. This study aims to determine the effect of bentonite and palm shell ash composition on geopolymers' physical and mechanical characteristics. All materials are mashed, mixed, and molded with a 5x5x5 cm3 cube. Ten specimens were prepared with bentonite - palm shell ash compositions are 40/45, 45/40, 50/35, 55/30, and 60/25 wt%. Meanwhile, the composition of NaOH, Na2SiO3, superplasticizer and water remained at 1.3, 7.7, 2, and 5 wt%, respectively. Then the samples were dried at room temperature for 24 hrs and heated at 60 °C or 80 °C for 12 hrs. The geopolymer concrete with the best characteristics was obtained with a composition of 40 wt% bentonites and 45 wt% palm shell ash by heating at 80 °C. This specimen has a compressive strength of 11.94 MPa with a density of 2.42 g/cm3, porosity of 8.43%, and absorption of 3.48%. The results have a chemical composition of 55.59% SiO₂, 9.45% Al2O3, and 8.22 Fe2O3 with a dominant quartz phase. Scanning electron microscope photo shows good bonding between particles, and there are no pores formed.
Co-Authors David Candra Birawidha Kusno Isnugroho Marjunus, Roniyus Muhammad Amin Muhammad Amin Siti Rahmadianti Suharto Yugo Chambioso