Use of concrete formulations based on dredging sand in the fabrication of tetrapods for protection of harbour dykes

Abstract

The construction and realization of port structures (quays and dykes) require a huge consumption of materials, especially concrete, this material consumes a large amount of materials including large quantities of sand, and to overcome the shortage of materials used in the formulation of concrete, We have considered the development of alternative solutions including the replacement of ordinary sand by dredged sand from the port of Agadir in the formulations of concrete, each year millions of cubic meters of dredged sand are dredged from Moroccan ports, without ever trying to valorize them.After having demonstrated in a previous work the possibility of using the dredged sand of the port of Agadir in concrete formulations [4], the present work consists in showing the possibility of using this dredged sand of the port of Agadir in concrete formulations able to be used in the construction of tetrapods and this to play the role of concrete port protection works, The concrete formulation studied for the realization of the tetrapods will be based on dredging sand, more precisely 50% of the sand entering in the formulation is dredging sand extracted from the port of Agadir. The possible use of dredging sand in the concrete of the tetrapods will allow to realize enormous gains on the quantities of sand entering in the concrete formulations and thus a lesser consumption of construction materials, and it will also play a more important role in the preservation of the marine environment by avoiding the trapping of the dredging materials.