Article Per Year (5 Year)
p-Index From 2021 - 2026
0.61
P-Index
This Author published in this journals
All Journal VALENSI Dental Journal (Majalah Kedokteran Gigi)
Jabrail, Fawzi H.
Unknown Affiliation
Chemistry Dentistry

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Improvement of Rheological Properties of Modified Asphalt Treated with Residues of Recycled Rubber from Waste Tires and Oxidized by Air Al-Ojar, Roua’a K.; Mahmood, Mahmood E.; Marzena, Salam J.; Jabrail, Fawzi H.
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.41928

Abstract

Asphalt materials loaded with polymer additives have gained particular importance in recent years due to their close association with modification processes and the creation of a clean environment, mainly from plastic wastes in paving and other areas, and they have also caused significant improvement in asphalt properties. It was observed through the research that the rheological properties of the asphalt were improved significantly as added residues of recycled rubber (RRR) from waste tire percentages increased. The observations are apparent from the decrease in permeability of the asphalt and enhance its ductility and elongation. The study focused on modifying the rheological properties of asphalt materials using the residues of the recycled process of rubber (RRR) from waste tires (mainly carbon black, containing residues of rubber extracted from waste tires). The asphalt materials were oxidized in the open system under various conditions of temperature and oxidation time in the presence of a 0.25% (w/w) anhydrous aluminum chloride (AlCl3) catalyst. After determining the optimal conditions for the oxidation process, the added anhydrous AlCl3 catalyst was adjusted to determine its optimal ratio. The modified asphalt samples after oxidation at optimal conditions in the presence of anhydrous AlCl3 catalyst and the recycled rubber (RRR) residues were tested using appropriate measurements. The following measurements of ductility, permeability, softening point, Marshall stability and flow, aging resistance (thin film oven test (TFOT)) and the asphalt content percentages were done, and their results show that the modified asphalt exhibits completely different rheological properties from the original asphalt. The studied N19 and N20 models show availability in paving applications.
Impact of chitosan modification on the material properties of acrylic resin base Al-Takai, Ihssan F.; Al-Nema , Luma; Jabrail, Fawzi H.
Dental Journal (Majalah Kedokteran Gigi) Vol. 58 No. 2 (2025): June
Publisher : Faculty of Dental Medicine, Universitas Airlangga https://fkg.unair.ac.id/en

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/j.djmkg.v58.i2.p107-112

Abstract

Background: 3D-printed polymethyl methacrylate is a light-cured commercial resin used in the 3D printing sector due to its affordability, good adaptability, minimal odor, and low irritation. Purpose: To investigate the impact of modified chitosan on the surface hardness and flexural strength of printed dental resin. Methods: A modified chitosan solution was cross-linked with adipic acid at concentrations of 0.1, 0.05, and 0.01 wt.% and then added to 3D-printable acrylic resin at 2, 5, and 10 wt.%. After addition, samples were prepared to test surface hardness and flexural strength. A total of 100 specimens were used in the research, grouped into 10 sets. Five specimens were prepared for each additive percentage, and five specimens served as a control group (3D-printable resin without modification) for each test. Results: The results showed that the (adipic acid/chitosan) 0.1/2 wt.% group had the highest flexural strength (134.370 MPa) and surface hardness (32.46 VHN), while the lowest flexural strength (49.198 MPa) and surface hardness (21.22 VHN) were observed in the (adipic acid/chitosan) 0.01/10 wt.% group. Conclusion: Modification of chitosan with adipic acid positively influences the flexural strength and surface hardness of 3D-printed denture bases. However, increasing the chitosan content beyond 2 wt.% reduces both surface hardness and flexural strength in modified 3D-printed polymers.
Improvement of Rheological Properties of Modified Asphalt Treated with Residues of Recycled Rubber from Waste Tires and Oxidized by Air Al-Ojar, Roua’a K.; Mahmood, Mahmood E.; Marzena, Salam J.; Jabrail, Fawzi H.
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.41928

Abstract

Asphalt materials loaded with polymer additives have gained particular importance in recent years due to their close association with modification processes and the creation of a clean environment, mainly from plastic wastes in paving and other areas, and they have also caused significant improvement in asphalt properties. It was observed through the research that the rheological properties of the asphalt were improved significantly as added residues of recycled rubber (RRR) from waste tire percentages increased. The observations are apparent from the decrease in permeability of the asphalt and enhance its ductility and elongation. The study focused on modifying the rheological properties of asphalt materials using the residues of the recycled process of rubber (RRR) from waste tires (mainly carbon black, containing residues of rubber extracted from waste tires). The asphalt materials were oxidized in the open system under various conditions of temperature and oxidation time in the presence of a 0.25% (w/w) anhydrous aluminum chloride (AlCl3) catalyst. After determining the optimal conditions for the oxidation process, the added anhydrous AlCl3 catalyst was adjusted to determine its optimal ratio. The modified asphalt samples after oxidation at optimal conditions in the presence of anhydrous AlCl3 catalyst and the recycled rubber (RRR) residues were tested using appropriate measurements. The following measurements of ductility, permeability, softening point, Marshall stability and flow, aging resistance (thin film oven test (TFOT)) and the asphalt content percentages were done, and their results show that the modified asphalt exhibits completely different rheological properties from the original asphalt. The studied N19 and N20 models show availability in paving applications.
Co-Authors Al-Nema , Luma Al-Ojar, Roua’a K. Al-Takai, Ihssan F. Mahmood, Mahmood E. Marzena, Salam J.