Abstract
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.
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Abbreviations
- |E*|:
-
Complex modulus, MPa
- P :
-
Wölher curve slope
- C p :
-
Specific heat capacity, Jkg−1K−1
- T :
-
Time, s
- X :
-
Abscissa, m
- l :
-
Bitumen thickness, m
- L :
-
Distance between interface and TC5, m
- T :
-
Average estimated temperature, °C
- Tbs:
-
Bitumen surface temperature, °C
- Tss:
-
Substrate surface temperature, °C
- TCi :
-
Temperature measured by sensor i
- TCR:
-
Thermal contact resistance Km²W−1
- R a :
-
Arithmetic average of the absolute values of surface roughness
- R q :
-
Quadratic roughness of surface profile
- N EN :
-
Number of cycles
- R, r :
-
Compression strength, MPa of the measured profile height deviation, μm
- λ :
-
Thermal conductivity, Wm−1K−1
- ρ :
-
Density, kgm−3
- φ :
-
Heat flux density Wm−2
- ε 6 :
-
Strain at 106 cycles
- ε :
-
Strain
- s :
-
Granular substrate
- b :
-
Bitumen
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Somé, S.C., Gaudefroy, V. & Delaunay, D. A new laboratory method to evaluate the influence of aggregate temperature on the binder-aggregate bonding: first results. Mater Struct 47, 963–976 (2014). https://doi.org/10.1617/s11527-013-0106-5
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DOI: https://doi.org/10.1617/s11527-013-0106-5