Abstract
In Morocco, significant quantities of phosphogypsum are produced yearly, as a result of the industrial process of producing phosphoric acid from phosphate sedimentary rocks. Different methods of valorization are being developed and it seems that using phosphogypsum in road construction is a promising path, either as a backfill, in the sub-base or the base layer. This solution, which inscribes within the framework of circular economy, will also help with construction material shortage problems. To implement this concept in its industrial complexes in Safi and Jorf Lasfar, OCP group built different partnerships. The purpose of this paper is to maximize phosphogypsum use in replacement to fine sand, by treating it with granular corrector and addition of cement. There are several road pavements structures, but so as to determine which type best suits to phosphogypsum recycling, a parametric study has been conducted on three types of pavement: mixed structure, reverse structure, and with hydraulic binder-treated base, by varying three essential factors, namely soil bearing capacity, traffic and phosphogypsum performances.
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