Effect of aggregate graining compositions on skid resistance of Exposed Aggregate Concrete pavement

Resilient and Safe Road Infrastructure

土木建筑工程

Wasilewska, Marta^1 ; Gardziejczyk, Wladyslaw^1 ; Gierasimiuk, Pawel^1

Bialystok University of Technology, Wiejska 45A, Bialystok

15-351, Poland^1

关键词: Aggregate concrete;    Coefficient of frictions;    Friction coefficients;    Laboratory methods;    Macrotexture measurement;    Maximum aggregate sizes;    Polishing processs;    Significance levels;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/356/1/012001/pdf
DOI  :  10.1088/1757-899X/356/1/012001

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The paper presents the evaluation of skid resistance of EAC (Exposed Aggregate Concrete) pavements which differ in aggregate graining compositions. The tests were carried out on concrete mixes with a maximum aggregate size of 8 mm. Three types of coarse aggregates were selected depending on their resistance to polishing which was determined on the basis of the PSV (Polished Stone Value). Basalt (PSV 48), gabbro (PSV 50) and trachybasalt (PSV 52) aggregates were chosen. For each type of aggregate three graining compositions were designed, which differed in the content of coarse aggregate > 4mm. Their content for each series was as follows: A - 38%, B - 50% and C - 68%. Evaluation of the skid resistance has been performed using the FAP (Friction After Polishing) test equipment also known as the Wehner/Schulze machine. Laboratory method enables to compare the skid resistance of different types of wearing course under specified conditions simulating polishing processes. In addition, macrotexture measurements were made on the surface of each specimen using the Elatexure laser profile. Analysis of variance showed that at significance level α = 0.05, aggregate graining compositions as well as the PSV have a significant influence on the obtained values of the friction coefficient μm of the tested EAC pavements. The highest values of the μm have been obtained for EAC with the lowest amount of coarse aggregates (compositions A). In these cases the resistance to polishing of the aggregate does not significantly affect the friction coefficients. This is related to the large areas of cement mortar between the exposed coarse grains. Based on the analysis of microscope images, it was observed that the coarse aggregates were not sufficiently exposed. It has been proved that PSV significantly affected the coefficient of friction in the case of compositions B and C. This is caused by large areas of exposed coarse aggregate. The best parameters were achieved for the EAC pavements with graining composition B and C and trachybasalt aggregate.