Use of oyster shell (Crassostrea gigas) as aggregate replacement for producing environmentally-friendly concrete

• Main Author: Pinto Dabés Guimarães, Ana
• Other Authors: Pau, Grégoire, David, Perlot, Céline
• Format: Thesis
• Language: English
• Published: 2022
• Subjects: Coquille d'huître; Analyse de cycle de vie; Durabilité; Béton; Oyster shell; Life cycle assessment; Durability; Concrete; 624; Crassostrea gigas
• Online Access: http://www.theses.fr/2022PAUU3009/document

Ce projet vise à formuler un béton avec des coquilles d'huîtres en substitution des granulats pour diminuer l'impact environnemental. Dans un premier temps, l'optimisation du squelette granulaire a été menée et validée sur des mortiers. Puis, une large campagne expérimentale est conduite sur le matériau béton selon l'approche performantielle pour justifier de son utilisation: essais mécaniques et de durabilité. Pour finir, une analyse de cycle de vie évalue la diminution des impacts environnementaux de la solution proposée. Due to the depletion of resources, by-products claim attention to be reused or reincorporated in other materials. Cementitious materials are on the top of the list of the most consumed materials which traditionally leads to a high demand for raw materials. In the actual context of net zero emissions target and circularity economy, building materials must be reinvented through a more sustainable approach. Based on this, bio-based materials have been attracting attention to be incorporated into building materials, improving materials properties and providing lower environmental burdens. Within this context, the Nouvelle-Aquitaine region (France), the Arcachon bay shellfish farming Comittee and France University Institute funded the BECCoH project, which aims to assess the potential use of crushed oyster shells (OS) in concrete. The oyster farming activity is largely developed in this region and generates a high amount of waste (shells) due to the maintenance and cleaning process in the farming area on top of food consumption. In general, the shells represent over 70% of the oyster weight, leading to over 700 kilograms of waste per ton of production. Therefore, the BECCoH project has been built to evaluate the reuse of crushed oyster shells as aggregate replacement in cementitious materials, raising awareness in the local community about alternative sustainable solutions for local by-products. In this context, this PhD thesis aims to investigate the use of crushed oyster shells to fully ...