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Utilization of citric acid in bituminous paving mixtures

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Abstract

Citric acid (CA) has not been used yet by the researchers for asphalt binder/mix modification, so it is potentially available worldwide at much lower cost (on the order of 1.25 USD/kg) compared to other common modifiers. In this study, binder properties for various amounts of CA were tested. Furthermore, the mechanical response of stone mastic asphalt (SMA) was also studied. The test results of CA/asphalt binders and mixes were compared with those of control binders and mixes and found to be better than SMA mixes in terms of rutting, moisture and temperature susceptibility. Although flexural strength properties of CA/SMA mixes are lower than SMA mixes, they considered to be acceptable. 2% of CA by weight of asphalt is recommended for enhancement of CA/SMA performance.

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Acknowledgments

The writer wishes to extend his appreciation to the Materials Laboratory, Harbin Institute of Technology (HIT), China, for technical assistance, as well as to the various companies that provided the materials used in this study.

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Authors and Affiliations

  1. Dept. of Civil Eng., Mosul Univ., Mosul, Iraq

    Al-Hadidy A. Ibrahim

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  1. Al-Hadidy A. Ibrahim
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Correspondence to Al-Hadidy A. Ibrahim.

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Peer review under responsibility of Chinese Society of Pavement Engineering.

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Ibrahim, AH.A. Utilization of citric acid in bituminous paving mixtures. Int. J. Pavement Res. Technol. 13, 361–365 (2020). https://doi.org/10.1007/s42947-020-0198-6

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  • DOI: https://doi.org/10.1007/s42947-020-0198-6

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