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Laboratory and Field Performance of PGXX-28 and PGXX-34 Binders and New Binder Type Selection Catalog
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2025-02-01
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[PDF-7.64 MB]
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Edition:September 2018–August 2022
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Abstract:Asphalt binder is one of the most expensive and critical materials used in the construction and maintenance of asphalt pavements. A key step toward a long-lasting asphalt pavement is selecting a proper binder performance grade (PG). The Texas Department of Transportation’s current binder PG selection catalog serves its purpose well for new pavement constructions but not for overlays. The most significant difference between new constructions and asphalt overlays is preexisting cracks underlying the asphalt overlays. The preexisting cracks significantly impact asphalt overlay performance in terms of early reflective cracking, which was not considered in the current PG binder selection catalogs. This project evaluated many softer but polymer-modified asphalt binders in laboratory and field performance. These soft, highly modified binders (PGxx-28 or PGxx-34) proved to have better cracking resistance and are recommended to be used in the colder areas of Texas. A new statewide binder selection catalog was developed and validated based on the laboratory test results, field observations, and overlay performance simulations. In addition, an IDEAL cracking test was performed to evaluate binder quality through aging and mix cracking resistance.
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