Evaluation of rutting resistance of asphalt binders and asphalt mixtures modified with polyphosphoric acid |
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Authors: | Mohammad Jafari Aliasghar Akbari Nasrekani Mostafa Nakhaei Abbas Babazadeh |
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Affiliation: | School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran |
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Abstract: | In this research, a polyphosphoric acid (PPA) additive was used to modify a performance graded binder (PG 58-22). Experimental program included use of three PPA contents (0.5%, 1%, and 1.5%) by weight of bitumen and use of antistripping limestone aggregates. High-temperature rheological properties of asphalt binders were evaluated through the frequency sweep test. Complex modulus test was also used to evaluate rutting characteristics of asphalt mixtures. Results showed that PPA significantly improved rutting resistance of both unmodified asphalt binder and unmodified asphalt mixture, especially for the asphalt binder. |
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Keywords: | Asphalt binder asphalt mixture complex modulus frequency sweep polyphosphoric acid rutting resistance |
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