Comparison of Two Rehabilitation Worksites of Motorways Single Versus Double Layered CRCP

The technique of continuously reinforced concrete is used in Belgium for the construction or rehabilitation of heavily trafficked motorway sections. Since a few years, double layered CRCP is being considered in order to improve the rolling noise characteristics of the surface. In this paper, two worksites where CRCP was used, will be compared, one with a single layer design, the other one with the double layer concept. The first one is the renewal of a part of motorway E17 south of the city of Ghent, built in 2011; the second worksite is located on the motorway from the east of Belgium towards Antwerp, construction took place in 2012. Attention will be paid to the benefits and challenges of both techniques in terms of design (thickness, position of the steel reinforcement, base layers), concrete mixes (specifications and results for the single layer concrete, for the bottom and the top layer of the double layer concrete) and construction aspects (concrete plants, supply, compaction). Finally the surface characteristics of both new motorway sections will be compared and the choice for one or the other technique will be evaluated.