Dual circular use of dredged sediments as sand and binder replacement in mortars and Controlled Low-Strength Materials (CLSM)

This project aims to turn dredged sediments into a useful resource for the construction sector, rather than treating them as waste. The approach is based on a dual reuse strategy: sediments are used as a partial replacement for natural sand and, after appropriate activation, as a partial replacement for cement in mortars and Controlled Low-Strength Materials (CLSM).

The project focuses on non-structural and infrastructure applications, including masonry and repair mortars, as well as flowable materials for trench backfilling and underground works. These applications are well suited to real construction conditions and allow large volumes of material to be reused. Pilot and pre-industrial demonstrations will be carried out in Normandy using locally sourced dredged sediments and existing industrial practices.

By reducing the use of virgin sand and clinker, the project contributes to lower environmental impact, supports regional circular value chains, and develops solutions that can be replicated across other ECIV regions.