Evaluation of the resistance of modified bitumen to low-temperature cracking based on the colloidal index
[ 1 ] Instytut Budownictwa, Wydział Inżynierii Lądowej i Transportu, Politechnika Poznańska | [ P ] employee
PL Ocena odporności asfaltu modyfikowanego na spękania niskotemperaturowe na podstawie wskaźnika koloidalnego
2024
scientific article
english
- bitumen
- asphalt mixtures
- fracture resistance
- low-temperature cracking
- colloidal index
EN One of the causes of damage to bitumen pavements in regions of the world with sub-zero temperatures is low-temperature cracking. To counter this phenomenon, asphalt mixtures (MMA) are being designed to resist the occurrence of such cracks. The choice of bitumen binder is crucial to the service life of a road pavement and its resistance to cracking. In this paper, the authors evaluated the influence of binder type on the low-temperature resistance of asphalt mixtures. Several modified bitumens, both medium and high-modified (HiMA), were used in the study. The basic parameters of the bitumens (softening point, penetration) as well as the group composition (SARA) were determined. The colloidal index was used as a criterion for the correct choice of binder. Low-temperature cracking resistance tests were also carried out on asphalt mixtures. The study was conducted using the TSRST method. The results showed that the use of modified bitumen improves the performance of MMA at low temperatures. It was also noted that the assessment of low-temperature cracking resistance using the colloidal index is not effective for modified bitumens; a different test methodology needs to be developed for their assessment.
03.10.2024
267 - 282
CC BY (attribution alone)
open journal
final published version
at the time of publication
70
0,5 [List 2023]