RESISTANCE OF ASPHALT COURSES TO PERMANENT DEFORMATIONS IN THE FORM OF RUTS
Last modified: 2017-02-28
Abstract
The carriageway driving surface must have all the properties which guarantee safe and comfortable drive. One very significant property of the operating level of asphalt carriageways is the occurrence of permanent deformations in the form of ruts. The resistance of asphalt courses to rutting depends on several factors such as the properties of component materials of asphalt, composition of asphalt mix, properties and position of placed asphalt course in the pavement structure.
Measurements of the asphalt resistance to rutting were done using the small size Wheel Tracker measuring device, procedure B (in the air) in accordance with the standard HRN EN 12697- 22. The work also included analyzing the dependence of the rut depth and the rutting speed on the composition of asphalt specimen, as well as the relative depth of rut in relation to the asphalt base in an optimal asphalt composition. The interdependence between the composition of asphalt specimen (three-component system) and composition of asphalt mix (twocomponent system) was also analyzed. The method of determining the resistance to rutting is described, as well as the testing requirements, testing stages and the complete procedure for determination of set parameters. The quality of asphalt mix components was previously laboratory tested, thus giving the input properties for designing the optimal asphalt composition. The confirmed optimal asphalt composition from the aspect of resistance to deformation was tested on varying thickness of courses and different combinations of asphalt courses. The influence of waterproofing and concrete carriageway slab as base on bridges was also tested for rutting. The degree of influence of bitumen as binder on the level of asphalt resistance to rutting was also tested on a series of asphalt courses, i.e. carriageway systems.
The determined dependence between parameters of asphalt courses tested by rutting and the asphalt components and asphalt mix components define the guidelines for pavement structure design. Asphalt pavement with a higher level of resistance to rutting shall fulfill the main road serviceability requirements over a longer period of exploitation.
Measurements of the asphalt resistance to rutting were done using the small size Wheel Tracker measuring device, procedure B (in the air) in accordance with the standard HRN EN 12697- 22. The work also included analyzing the dependence of the rut depth and the rutting speed on the composition of asphalt specimen, as well as the relative depth of rut in relation to the asphalt base in an optimal asphalt composition. The interdependence between the composition of asphalt specimen (three-component system) and composition of asphalt mix (twocomponent system) was also analyzed. The method of determining the resistance to rutting is described, as well as the testing requirements, testing stages and the complete procedure for determination of set parameters. The quality of asphalt mix components was previously laboratory tested, thus giving the input properties for designing the optimal asphalt composition. The confirmed optimal asphalt composition from the aspect of resistance to deformation was tested on varying thickness of courses and different combinations of asphalt courses. The influence of waterproofing and concrete carriageway slab as base on bridges was also tested for rutting. The degree of influence of bitumen as binder on the level of asphalt resistance to rutting was also tested on a series of asphalt courses, i.e. carriageway systems.
The determined dependence between parameters of asphalt courses tested by rutting and the asphalt components and asphalt mix components define the guidelines for pavement structure design. Asphalt pavement with a higher level of resistance to rutting shall fulfill the main road serviceability requirements over a longer period of exploitation.
Keywords
driving surface, ruts, asphalt mix, pavement, waterproofing
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