Microstructure and Durability Properties of Concretes Based on Oyster Shell Co-products

One of the solutions to reduce the environmental impact of the construction sector is the use of alternative materials, more sustainable and with tailored or new properties. This paper proposes the valorization of oyster shell co-products within cementitious materials. These co-products from oyster farm could be used to produce composites with interesting properties. Shell co-products are used in this study to produce load-bearing concretes. These concretes show good durability properties with a lower chloride diffusion coefficient and a higher resistivity compared to references concretes. The optimum mix is composed of CEM III and 50%vol of oyster shell as aggregate. A good cohesion between the particles of oyster shell and the binding matrix is observed, which explains the feasibility to get concretes of mechanical resistance such as the references.