Abstract
The article presents the results of research on temperature sensitivity of ground rubber modified asphalt binders. The tests were performed for 50/70 penetration grade road bitumen and two kinds of granulated rubber: activated and inactivated. Such parameters of asphalt binders as: penetration, softening point, dynamic shear modulus and phase angle have been determined and on this basis the temperature susceptibility of the reference bitumen and asphalt binders modified by activated and inactivated rubber have been determined. All the tests were carried out for three observation levels: without aging and after aging simulations carried out by RTFOT and PAV methods. The tests revealed that addition of granulated rubber has a positive influence on asphalt binder properties, even after the aging process, causing an increase in the softening point and a decrease in penetration and the phase angle of asphalt binder. Asphalt binders obtained in result of modification by addition of rubber show smaller temperature susceptibility than the reference bitumen (without addition of rubber). Also, a positive impact of aging on the temperature susceptibility was observed for the investigated binders.
Highlights
Nowadays, more and more attention is being paid to ecological solutions
The test in Dynamic Shear Rheometer was carried out according to the standard PN-EN 14770:2012 Bitumen and bituminous binders - Determination of complex shear modulus and phase angle using a Dynamic Shear Rheometer (DSR)
Temperature susceptibility of a binder is commonly defined by means of penetration index which is determined on the basis of the asphalt binder softening point and penetration
Summary
More and more attention is being paid to ecological solutions (protecting the environment). By using modifying additives in asphalt binder it is possible to obtain the following effects: decreasing temperature susceptibility [1÷8], increasing viscosity [6,9], increasing dynamic shear modulus at high temperatures and its decreasing at low temperatures [2,4,5,8], reduction of Fraass breaking point [7], raising the softening point [6,8,9], penetration value change [6,9]. The influence depends on the degree of fineness and the amount of used granulated rubber which affect the bitumen viscosity, its rheological properties, softening point change, the binder penetration and values of dynamic shear modulus [15,16,17,18]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
