The Effect of Using Acid-Modified Mixes on Performance of Asphalt Concrete

Globalization has paved its path for an increase in commercial vehicular traffic. Conventional bitumen used in the preparation of hot mix asphalt (HMA) layers is unable to cope up with the increased traffic load characteristics. Alternatively, asphalt modification with additives has proven its role in improving binder characteristics. In the present study, an attempt is made to evaluate the performance characteristics of conventional and acid-modified mixes when prepared using polyphosphoric acid (PPA). Resilient modulus, stripping and rutting characteristics are used for evaluation of performance characteristics of above-modified mixes. PPA was added to conventional bitumen (VG-30) at regular intervals in the laboratory. Marshall parameters were improved with acid modification when added in a conventional binder. It is observed from the test results that tensile strength has increased for acid-modified mixes. Rutting and stripping properties were enhanced for acid-modified mixes than conventional mixes. The addition of acid to conventional mix has also improved the stiffness of modified mix and has resulted in enhancement resilient modulus value. 3% PPA was arrived as optimum content for modification in conventional binders.

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  • English

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  • Accession Number: 01902435
  • Record Type: Publication
  • ISBN: 9789813290419
  • Files: TRIS
  • Created Date: Dec 16 2023 12:02PM