Influence of use of polymer-modified bitumen on the service life of asphalt pavements, with special emphasis to hot climates

Abstract

It is claimed that polymer-modified bituminous materials can bring real benefits to asphalt pavement construction and maintenance, in terms of better and longer lasting pavements, and savings in total road life costing. However, the choices of what materials to choose and how they perform is still a bit of a minefield at present, with little truly independent advice available. This dissertation aims to analyse the research carried out on this material and determine what may be achievable by the addition of various polymer modifiers. The problems that can be encountered in the storage of modified binders, the production of bituminous material, and the storage of the mixed material prior to laying will also be looked into. It has to be said at the outset that almost all modified bituminous materials are proprietary materials. This causes some problems in determining the benefits of the different materials on offer, and the ability to directly compare one material with another. It is unrealistic, and is not what an engineer should do, to just believe the claims of sales representatives. It has to be seen whether the higher price of polymer-modified bituminous asphalt and the possible changes to the production and laying systems are justified by an improved performance throughout the service life of roads and airport pavements. Special emphasis will be put to the benefits or detriments of the use of this material in hot climates.