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Abstract

Modification of Road Bitumen with Partial Desulfurized Crumb Rubber †

by
Simona-Bianca Ghimiș
1,
Gabriel Vasilievici
1,*,
Andreea-Luiza Mîrț
1,2,
Emilian Zaharia
3 and
Dorin Bomboș
3,4
1
National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM Bucharest, 202 Spl. Independentei, 060021 Bucharest, Romania
2
Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology Politehnica Bucharest, 313 Spl. Independenței, 060042 Bucharest, Romania
3
ATICA Chemicals SRL, 202 Căzănești str., Vâlcea, 240414 Râmnicu Vâlcea, Romania
4
Faculty of Petroleum Technology and Petrochemistry, Petroleum-Gas University of Ploieşti, 39 Bucuresti Blvd., 100680 Ploieşti, Romania
*
Author to whom correspondence should be addressed.
†
Presented at the 19th International Symposium “Priorities of Chemistry for a Sustainable Development”, Bucharest, Romania, 11–13 October 2023.
Proceedings 2023, 90(1), 34; https://doi.org/10.3390/proceedings2023090034
Published: 14 December 2023
(This article belongs to the Proceedings of 19th International Symposium “Priorities of Chemistry for a Sustainable Development”)
Versions Notes

Abstract

:
Incorporating crumb rubber into road bitumen represents a fundamental advancement in enhancing pavement performance and managing tire waste. While poly(styrene-butadiene-styrene) is a common choice for enhancing elasticity, its inherent limitations and environmental implications necessitate the exploration of alternatives. This study introduces the development of a novel crumb rubber derivative with superior elastic properties. The resulting modified bitumen exhibited a 58.3% reduction in crumb rubber sulfur content and a consistent asphaltene content of 18.7 ± 0.2%, ensuring its homogeneity. This research marks an advancement in producing elastic bitumen for specialized applications, contributing to sustainable road construction practices.

1. Introduction

The utilization of crumb rubber (CR) for modified road bitumen enhances the overall performance of pavement and offers a safe and green solution for the utilization of waste tires [1]. The modification of road bitumen involves the utilization of an elastomer to improve elastic behavior. The most utilized copolymer for the modification of road bitumen is poly(styrene-butadiene-styrene) (SBS), but the elastic component of this copolymer is a maximum of 30%. In our previous research [2], desulfurized crumb rubber was obtained in the presence of metallic oxides, and the conversion in the desulfurization process of vulcanized rubber was influenced both by the size of the adsorbent particles and also by the nature of the adsorbent.
This paper presents the development of a new component from the processing of crumb rubber, which has improved elastic properties necessary for modified road bitumen.

2. Materials and Methods

Crumb rubber utilized in the present research was made from waste tires. For obtaining the elastomer for modified bitumen, a step of partial desulfurization of the crumb rubber in the presence of iron oxides at 260 °C was needed. The experimental studies of modification of road bitumen type D50/70 with desulfurized crumb rubber were performed in a semi-continuous installation provided with automatic temperature control at 160 °C, mechanical stirring at 220 rpm and a controlled dosing system of the desulfurized powder solution. The stability and homogeneity tests were performed by determining the asphaltene content, using the classical method of separation with solvent, of the upper area and the lower area of a tube of 25.4 mm diameter and 100 mm length containing the modified bitumen with desulfurized crumb rubber.

3. Results

The validation of the desulfurized crumb rubber was made by determining the sulfur content and testing the modified road bitumen’s physical properties, stability and homogeneity. After desulfurization, the sulfur concentration of crumb rubber decreased by 58.3%. The asphaltene content of modified road bitumen determined in the upper and lower areas was 18.7 ± 0.2%, demonstrating the homogeneity of the mixture.

4. Conclusions

To study the modification of road pavement bitumen with partial desulfurized crumb rubber, firstly we obtained a partial desulfurized crumb rubber, followed by the conditioning of bitumen to obtain modified bitumen with improved elastic properties for applications in sensitive areas such as bridges and runways.

Author Contributions

Conceptualization, S.-B.G. and G.V.; methodology, D.B.; formal analysis, E.Z.; resources, E.Z. and G.V.; data curation, A.-L.M.; writing—original draft preparation, S.-B.G. and A.-L.M.; writing—review and editing, G.V.; visualization, E.Z.; supervision, G.V. and D.B.; project administration, E.Z. and G.V.; funding acquisition, E.Z. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by a grant from the Ministry of Research, Innovation and Digitization, CCCDI-UEFISCDI, project number PN-III-P2- 2.1-PTE-2021-0552, within PNCDI III.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

References

  1. Li, J.; Wang, J.; Xiao, F.; Amirkhanian, S.N. Characterizing Compatibility of Crumb Rubber Modified Asphalt by Customized Drainage Method. J. Test. Eval. 2020, 49, 20190856. [Google Scholar] [CrossRef]
  2. Mîrţ, L.-A.; Bomboş, D.; Ghimiş, S.; Bomboş, M.M.; Vasilievici, G. Partial Desulfurization of Crumb Rubber in the Presence of Metallic Oxides. Stud. UBB Chem. 2023, 68, 225–238. [Google Scholar] [CrossRef]
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Share and Cite

MDPI and ACS Style

Ghimiș, S.-B.; Vasilievici, G.; Mîrț, A.-L.; Zaharia, E.; Bomboș, D. Modification of Road Bitumen with Partial Desulfurized Crumb Rubber. Proceedings 2023, 90, 34. https://doi.org/10.3390/proceedings2023090034

AMA Style

Ghimiș S-B, Vasilievici G, Mîrț A-L, Zaharia E, Bomboș D. Modification of Road Bitumen with Partial Desulfurized Crumb Rubber. Proceedings. 2023; 90(1):34. https://doi.org/10.3390/proceedings2023090034

Chicago/Turabian Style

Ghimiș, Simona-Bianca, Gabriel Vasilievici, Andreea-Luiza Mîrț, Emilian Zaharia, and Dorin Bomboș. 2023. "Modification of Road Bitumen with Partial Desulfurized Crumb Rubber" Proceedings 90, no. 1: 34. https://doi.org/10.3390/proceedings2023090034

APA Style

Ghimiș, S. -B., Vasilievici, G., Mîrț, A. -L., Zaharia, E., & Bomboș, D. (2023). Modification of Road Bitumen with Partial Desulfurized Crumb Rubber. Proceedings, 90(1), 34. https://doi.org/10.3390/proceedings2023090034

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