Compaction and shearing behaviour study of recycled aggregates

The aggregates resulting from the recycling of the products of demolition lie within the scope of local materials replacement and this study contributes to their valorisation in the field of the civil engineering, particularly in roads. After having sorted and selected the recycled aggregates, their characterization will bear on the comparison of the physical and mechanical behaviour of the recycled aggregates and natural materials (sand and gravel). In order to study their mechanical response and determine their mechanical characteristics the proctor test, the CBR test and the shearing test have been carried out. The result obtained showed that their characteristics are lower than those of the natural aggregates. Then, we tried to improve them by the following additions (sand, cement and brick). The combination of these materials two to two enabled us to improve some of their physical and mechanical characteristics and bring them near to the natural aggregates. Moreover, repeated shearing of the same sample, in each initial state of stress, highlighted the durability of the aggregates, and particularly their crushing phenomenon.