Determination of percent working binder in recycled asphalt pavement materials

I. L. Al-Qadi; S. H. Carpenter; G. L. Roberts; H. Ozer

doi:10.1201/9780203881200.ch47

Determination of percent working binder in recycled asphalt pavement materials

I. L. Al-Qadi, S. H. Carpenter, G. L. Roberts, H. Ozer

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The amount of working binder available in RAP materials is unknown. A research plan was developed to determine the amount of working binder using complex modulus measurements of mixes containing stockpile RAP and the aggregate and binder recovered from the original RAP. The mixtures made from the recovered RAP materials were used as a basis of comparison to determine the amount of working binder. The testing was not able to determine an amount of working binder. However, when investigating the mix design method, it was found that the RAP mixes were behaving as if 100% of the binder was working. It was also determined that double bumping the asphalt grade softened the mix. Future use of RAP in mixes should not require special considerations in mix design, but the new binder should be modified to offset an increased stiffness produced with the use of RAP.

Original language	English (US)
Title of host publication	Efficient Transportation and Pavement Systems
Subtitle of host publication	Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads
Publisher	CRC Press
Pages	505-516
Number of pages	12
ISBN (Print)	9780415489799
DOIs	https://doi.org/10.1201/9780203881200.ch47
State	Published - 2008
Externally published	Yes

Publication series

Name	Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Transportation

Access to Document

10.1201/9780203881200.ch47

Cite this

Al-Qadi, I. L., Carpenter, S. H., Roberts, G. L., & Ozer, H. (2008). Determination of percent working binder in recycled asphalt pavement materials. In Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads (pp. 505-516). (Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads). CRC Press. https://doi.org/10.1201/9780203881200.ch47

Determination of percent working binder in recycled asphalt pavement materials. / Al-Qadi, I. L.; Carpenter, S. H.; Roberts, G. L. et al.
Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads. CRC Press, 2008. p. 505-516 (Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Al-Qadi, IL, Carpenter, SH, Roberts, GL & Ozer, H 2008, Determination of percent working binder in recycled asphalt pavement materials. in Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads. Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads, CRC Press, pp. 505-516. https://doi.org/10.1201/9780203881200.ch47

Al-Qadi IL, Carpenter SH, Roberts GL, Ozer H. Determination of percent working binder in recycled asphalt pavement materials. In Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads. CRC Press. 2008. p. 505-516. (Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads). doi: 10.1201/9780203881200.ch47

Al-Qadi, I. L. ; Carpenter, S. H. ; Roberts, G. L. et al. / Determination of percent working binder in recycled asphalt pavement materials. Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads. CRC Press, 2008. pp. 505-516 (Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads).

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abstract = "The amount of working binder available in RAP materials is unknown. A research plan was developed to determine the amount of working binder using complex modulus measurements of mixes containing stockpile RAP and the aggregate and binder recovered from the original RAP. The mixtures made from the recovered RAP materials were used as a basis of comparison to determine the amount of working binder. The testing was not able to determine an amount of working binder. However, when investigating the mix design method, it was found that the RAP mixes were behaving as if 100% of the binder was working. It was also determined that double bumping the asphalt grade softened the mix. Future use of RAP in mixes should not require special considerations in mix design, but the new binder should be modified to offset an increased stiffness produced with the use of RAP.",

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Determination of percent working binder in recycled asphalt pavement materials

Abstract

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