Abstract
This study was conducted to quantitatively and statistically evaluate the effects of material source on the ductility of asphalt-binders, measured in terms of the elastic recovery (ER) property. The ER data used in the study were excerpted from the Texas flexible pavements and overlays database, namely, the Texas Data Storage System (DSS), covering plant-mix extracted PG XX-22 asphalt-binders (i.e., rolling thin film oven (RTFO) residues) from 20 different sources and measured using the Ductilometer test at 10°C. The findings of the study indicated that material source has an impact on the ER property of asphalt-binders. Statistically significant differences were observed among some sources and suppliers that reported the same low-temperature asphalt-binder type/grade (i.e., PG XX-22). Overall, the study contributes to enriching the literature on the material-source effects on asphalt-binders’ ER properties, consistency, variability, and data quality. In particular, the study highlights the sensitivity nature of the asphalt-binder ER parameter to material-source effects.
Highlights
Among many other influencing factors, the quality consistency and properties of asphalt-binders are dependent on the production process and, subsequently, the corresponding asphalt-binder sources and suppliers [1,2,3]
Laboratory Test Results and Analysis e following section presents an analysis of the results for 20 plant-mix extracted asphalt-binders (PG XX-22), treated as rolling thin film oven (RTFO) residue, from 20 different sources and suppliers
All the hot-mix asphalt (HMA) mixes associated with Performance Grading (PG) 64-22 asphalt-binders were comprised of recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS) additives; see Table 1. erefore, it is possible that these additives contributed to the low elastic recovery (ER) values of some PG 64-22 asphalt-binders such as Source04, which may not have been the case for Source12, Source16, and Source17 that exhibit ER values around 50% and ranked in the 3th, 4rd, and 5th positions in terms of performance superiority (Table 2)
Summary
Among many other influencing factors, the quality consistency and properties of asphalt-binders are dependent on the production process and, subsequently, the corresponding asphalt-binder sources and suppliers [1,2,3]. Different asphalt-binders from different sources and suppliers, even those classified with the same type/grade, may exhibit different rheological and viscoelastic properties that have an inherent impact on the resultant hot-mix asphalt (HMA) properties and the overall field performance [3,4,5]. As mentioned above, asphalt-binders classified with the same types/grades but obtained from different sources and suppliers could exhibit different viscoelastic properties with different performance impacts on both the resultant HMA mixes and pavements in the field [3], the need to study the material-source effects on the asphalt-binders’ ductility and ER properties. Advances in Civil Engineering e ductility of asphalt-binders, as measured based on the ASTM D113-17 test standard [14], provides a good indicator for the long-term durability performance of asphalt-binders, allowing for the mitigation against cracking [15]. The ductility parameter continues to be used in many countries and is still used to provide a quantitative estimation and approximation of the asphaltbinder’s elastic properties, potential to recover after elongation or when subjected to tensile loading, and the resultant HMA’s cracking resistance potential [3, 20]
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