Tire-track resistance performance of acrylic resin emulsion coatings for colored asphalt pavements

In this work, the tire-track resistance performance of thermosetting acrylic resin polymers was studied thoroughly for the purpose of removing tire tracks and improving the colour durability of coloured asphalt pavement. The Wilhelmy plate method and sessile drop technique were applied to measure the surface energy of three types of acrylic resin emulsions as well as rubber tires. On the other hand, both physical and chemical methods were implemented to study the resistance of tire tracks and the degree of difficulty in removing the track on coloured asphalt pavement with different coatings. Through the experiments, it was found that the smaller the adhesion work between the resin emulsion and the tire residue was, the easier it was to clean the surface tire track. Furthermore, the smaller the adhesion work between the resin emulsion and the tire residue was, the less likely it was for tire marks to remain. Although spraying resin emulsion will reduce the friction resistance of the coloured asphalt pavement to a certain extent, it can still achieve the requirements of the specification. Therefore, through these analyses, the use of L4600-type resin emulsion as a coating layer is suggested to increase the colour durability of asphalt pavements as well as prevent the occurrence of ‘early failure’.