Valorisation of marine sediments with novel eco-friendly OPC-CSA composite binder
As an eco-friendly binder, ordinary Portland and calcium sulfoaluminate (OPC-CSA) composite binder are innovatively introduced in the Stabilization/solidification (S/S) of dredged marine sediments waste from Dunkirk harbour in France. This study scrutinizes the feasibility of using OPC-CSA composite binder for the S/S treatment of marine sediments waste as road construction materials, in terms of a series of modified Proctor compaction, immediate Californian Bearing Ratio (I-CBR) index, unconfined compressive strength, splitting tensile strength, and elastic modulus tests. The obtained experimental results show that the compaction, bearing capacity and mechanical performance of the OPC-CSA composite binder solidified sediments is significantly improved, as compared with the raw sediments and OPC/CSA single binder treated sediments. These parameters are highly dependent on the ratio of OPC/CSA, binder content and curing time. Especially, OPC played a significant role in developing the final mechanic performance, while CSA mainly promotes early- mechanical properties development. Therefore, the lab-scale experiment demonstrates that OPC-CSA composite binder could be considered as a green and high-performance binder for the S/S treatment of marine sediments waste in comparison to OPC.