Maximizing the envelope in asphalt research projects: a case study on the tendering process for test tracks using thin noise reducing asphalt layers

Abstract

For the development of new asphalt mixtures or determination of “real-life” properties in many research projects, the construction of test tracks is included. As in most cases a fixed budget is available for these test tracks, it is necessary to achieve the best value for money. Ideally, this means selecting the contractor with the most (proven) experience, constructing the test tracks as needed for the project (with the best possible quality), while still respecting the available budget and obeying any restrictions imposed by existing laws on public procurement. As a case study, the tendering process for the construction of different test tracks with so-called thin noise reducing asphalt layers in the city of Antwerp is described in detail. A tendering process in two steps was developed, where only experienced contractors, based on a reference list, were allowed to submit an offer in the second step. By utilizing several selection criteria, like overall comprehensiveness of the offer (and not just the price), technical quality of the proposed asphalt mixtures, and quality of the proposed work plan, a ranking was made of the remaining contractors. Only then, decisions had to be made regarding the actual size of the different test tracks, taking into account the overall budget. In this case, the purchaser had the opportunity to wait until the very last moment with making certain decisions (number and size of test tracks, number of different mixtures …), making it possible to maximize the envelope.