Calculation and prediction possibility of the dynamic viscosity of a mixture comprising road bitumen and reclaimed bitumen
Abstract
The reuse of reclaimed asphalt pavement in large quantities in new hot and warm asphalt mixtures has significant economic and environmental benefits. In this case, however, in order to achieve satisfactory performance of the final product scientific planning of the mixture and thorough control of production are essential. Before using the reclaimed asphalt pavement, a number of tests have to be performed to verify that the material meets the relevant requirements and can be used in hot or warm asphalt mixtures. It is essential to know the characteristics of the binder in the reclaimed asphalt pavement and the expected properties of the binder blend in the new asphalt mixture. For the prediction and calculation of the latter, the relevant European standard offers the calculation of the penetration or softening point of the binder blend in the mixture with reclaimed asphalt content.
The article deals with the measurement of the dynamic viscosity of bitumen blends of asphalt mixtures made using reclaimed asphalts, determined with a dynamic shear rheometer at a loading frequency of 1 rad/s. Furthermore, the relationships between the different composition ratios of national paving grade bitumens classified on the bases of penetration level and bitumens from reclaimed asphalt pavement are examined.
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