Aggregate properties affecting adhesive quality in asphalt mixtures

Abstract:

Asphalt-aggregate adhesion is a complex phenomenon influenced by properties from both materials. Thiswork aims at stablishing the influence of aggregate's chemistry, mixing temperature and surface texture over the quality of the asphalt-aggregate interface. To accomplish this goal, different asphalt-aggregates combinations were tested with a pull-off debonding test in which these properties of aggregates were changed accordingly. It was found out that SiO2 content within aggregates promote moisture damage, whereas Fe2O3 and CaO contents seems to inhibit it. Low mixing temperatures when performing the initial asphalt-aggregate bonding were also related to low adhesive performance. Finally, aggregate surface texture did not seem to have an effect over the dry quality of the asphalt-aggregate interface but does seem to have a positive effect over its performance under moisture conditions.

Año de publicación:

2020

Keywords:

Fuente:

scopus