Correlating Aggregate Friction Test Results Under Accelerated Laboratory Polishing and Aggregate Crushing

The frictional properties of the coarse aggregate used in asphalt concrete are a major contributor to the friction of the surface mixes. Selecting an aggregate that is not only polish and crush resistant to withstand the mechanical degradation and grinding under traffic loading, but also has a low f...

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Bibliographic Details
Published in:International journal of pavement research & technology 2024-03, Vol.17 (2), p.423-434
Main Authors: Saghafi, Mahdi, Abdallah, Imad N., Ahmad, Mohiuddin, Nazarian, Soheil, Herrera, Carlos
Format: Article
Language:English
Subjects:
Accelerated tests
Asphalt
Building Construction and Design
Civil Engineering
Compressive strength
Concrete aggregates
Correlation analysis
Engineering
Friction
Original Research Paper
Parameters
Polishes
Polishing
Structural Materials
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Summary:The frictional properties of the coarse aggregate used in asphalt concrete are a major contributor to the friction of the surface mixes. Selecting an aggregate that is not only polish and crush resistant to withstand the mechanical degradation and grinding under traffic loading, but also has a low friction loss rate and reasonable friction life is vital. A laboratory aggregate test program was carried out to evaluate the polishing/friction and crushing performance of 25 different aggregate sources from different locations. Two widely used friction test methods, i.e., British pendulum testing (BPT) and dynamic friction testing (DFT) in conjunction with the three-wheel polishing testing (TWPD) and the aggregate crushing value test (ACV) were used to quantify the polishing and crushing resistance of aggregates, respectively. Several frictional and crushing test parameters were introduced, analyzed, and finally, a correlation analysis was performed to relate different aggregate friction, polishing, and crushing test parameters. All three tests showed low variability when replicate samples were compared. A strong correlation ( R value of 0.92) was found between the friction loss rate and the ACV test parameters and a linear correlation with R 2 of greater than 0.80 was observed between the final friction life of the aggregate and the BPT test parameters. The ACV and TWPD/BPT tests can be potentially considered as an alternative test for friction evaluation of the coarse aggregates in case the DFT device is not available, with some loss in the sensitivity in characterizing marginal materials.
ISSN:1996-6814
1997-1400
DOI:10.1007/s42947-022-00245-z