Laboratorial evaluation of the bond condition between granular base and asphalt concrete
DOI:
https://doi.org/10.14295/transportes.v30i3.2725Keywords:
Bonding between layers, Interface shear, PavingAbstract
The bond condition between the aggregate base and the asphalt concrete is a factor that has significantly influence on the calculation of stresses, strains and displacements in its interior, therefore impacting its dimensioning. This article aims to experimentally evaluate the bond condition between these layers, by means of tests that investigated the interface shear, also verifying the influence of temperature, normal stress and different treatments of this interface. For this, the test presented in Scherer et al. (2020) was used, with which it is possible to evaluate the shear strength at the interface with normal stress actuation using a test apparatus coupled to a universal testing machine. The results obtained demonstrated that the temperature, the normal stress, and the treatment performed at the interface are correlated with shear strength and shear reaction modulus. Also, that the values of these are higher when applying of prime coat plus tack coat, at low temperatures and with high normal stress. For the conditions studied in this research, considering the reference values for the shear reaction modulus found in the international literature, the indication that the unbonded interface condition is the one that best represents the possible field condition was obtained.
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