A new laboratory method to evaluate the influence of aggregate temperature on the binder-aggregate bonding: first results

In this paper, the effects of aggregates temperature reduction in asphalt mix manufacturing process have been analyzed in terms of complex modulus, fatigue and stripping resistance according to standard tests. The limits of these conventional standardized tests have been analyzed and a new method ha...

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Bibliographic Details
Published in:Materials and structures 2014-06, Vol.47 (6), p.963-976
Main Authors: Somé, Saannibe Ciryle, Gaudefroy, Vincent, Delaunay, Didier
Format: Article
Language:English
Subjects:
Aggregates
Applied sciences
Asphalt
Assessments
Bitumen. Tars. Bituminous binders and bituminous concretes
Bonding
Building construction
Building Materials
Buildings. Public works
Civil Engineering
Contact
Engineering
Engineering Sciences
Exact sciences and technology
Fatigue tests
Machines
Manufacturing
Materials
Materials Science
Original Article
Processes
Solid Mechanics
Strength of materials (elasticity, plasticity, buckling, etc.)
Stripping
Structural analysis. Stresses
Theoretical and Applied Mechanics
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Summary:In this paper, the effects of aggregates temperature reduction in asphalt mix manufacturing process have been analyzed in terms of complex modulus, fatigue and stripping resistance according to standard tests. The limits of these conventional standardized tests have been analyzed and a new method has been developed to estimate the bitumen-aggregate bonding quality when aggregate temperature is reduced. This method is based on the thermal contact resistance (TCR) assessment at the bitumen-substrate interface which reflects the contact imperfection at the microscopic scale. The study has shown that the TCR decreases when the aggregate temperature increases. Consequently, the TCR could be used as a bonding quality criterion in asphalt manufacturing condition when aggregates temperature is reduced. The results have been well correlated with a modified mechanical stripping test developed. It has been proved that when aggregates temperature decreases, the TCR increases and the stripping resistance decreases due to the poor bitumen-aggregates bonding.
ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-013-0106-5