United States Department of Transportation
ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners.
As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
i
Effect of Aggregate-Binder Compatibility on Performance of Asphalt Mixtures in Arkansas
-
2023-08-01
[PDF-8.26 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Final Report
-
Corporate Publisher:
-
Abstract:The main objectives of this study were to assess compatibility among different types of binders and aggregates and to determine the maximum amount of sandstone aggregates in asphalt concrete surface mix (ACHM). To this end, three Performance Grade (PG) binders (PG 64-22, PG 70-22, and PG 76-22), each from six different sources were evaluated in the laboratory. Four types of aggregates (limestone, sandstone, novaculite, and dolomite), each from two different sources, were evaluated for their physical and mechanical properties. A total of 144 loose mixtures were subjected to the Texas Boiling Test (TBT). Five ACHM plant mixtures were evaluated by conducting performance tests such as dynamic modulus, Hamburg Wheel Tracking, Illinois Flexibility Index Test, Indirect Tensile Cracking Test (IDEAL-CT), and Tensile Strength Ratio. Furthermore, six ACHM mixtures with varying amounts of sandstone were prepared and tested in the laboratory. Sandstone aggregates were more absorptive than the others. Hard binders (e.g., PG 70-22) binders were found to possess higher adhesion energy than soft binders (PG 64-22). However, the performance properties of the binders were found to be crude-source dependent. The ACHM mixtures with high sandstone were found to be more susceptible to moisture damage and cracking. The tested binders, aggregates, and binder-aggregate systems were ranked based on their performance properties. t is recommended to set a maximum absorption of aggregates to 2%. The pH measurements of aggregates and binders can be incorporated into the QC/QA protocols to understand their compatibility, and the TBT can be followed to determine the moisture resistance of asphalt mixtures. Asphalt producers are suggested to use the most compatible aggregates and binders, based on the compatibility database provided in this report. It is also recommended to set the maximum level of sandstone in surface ACHM at 60%.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
