Geogrid Interlayer Performance in Pavements: Tensile-Bending Test for Crack Propagation

The roads durability is an objective that gains more and more importance because of the economical – environmental factors. A durable road surface should be provided in the course of repair operations. Geogrids (carbon, glass or steel fibbers) are used for increasing the durability of overlaid asphalt surfaces. They reduce fatigue cracks as well as thermal cracking and prevent structural deformation. This article presents experimental results based on the thermal shrinkage-bending test. The mechanical performances of two double layers complexes (unreinforced or reinforced by grids) are discussed and analysed. In terms of durability, ecology and economical reasons, the three solutions presented in this article, wants to expose the behaviour of a mixture that is reinforced (in three ways) to improve the consumption of eco-elements (like stone and bitumen) and also to improve the life time of the future work. After analyse the three solutions UN, FP and CF we can conclude that a weak mixture (in eco-elements) can be very well improved in using the two reinforcing solution, presented below.