Comparison of skid resistance of EAC pavement with different maximum aggregate grain size

ABSTRACT

The paper presents a comparison of friction coefficients and MPD (Mean Profile Depth) parameters of EAC (Exposed Aggregate Concrete) pavements with a maximum aggregate size of 8, 11 and 14 mm. In order to obtain for all tested EAC pavements the same conditions that simulate the phenomenon of polishing, tests were performed using a FAP (Friction After Polishing) machine in laboratory conditions. Macrotexture measurements were made on the surface of each sample using an Elatexure laser profile. In addition, three types of coarse aggregates were selected based on their resistance to polishing, which was determined on the basis of PSV (Polished Stone Value). Based on ANOVA, a significant influence of maximum aggregate size on both the friction coefficient and the MPD parameter was demonstrated. Along with the increase in the aggregate maximum grain size in EAC, the increase in MPD value was recorded. Despite of this fact, no effect of resistance to the polishing of aggregates with PSV from 48 to 52 on skid resistance was demonstrated. However, the decision to apply individual solutions should take into account road classification in the road network system, traffic volume and speed limits.

KEYWORDS:

• Friction coefficient
• macrotexture
• FAP machine
• polished stone value

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Ministry of Science and Higher Education [grant number WZ/WB-IIL/1/2020].