Alkali-Activated Red Mud and Construction and Demolition Waste-Based Components: Characterization and Environmental Assessment

Materials

Alessio Occhicone¹  Claudio Ferone¹  Ivana Bosković²  Mira Vukčević²  Serena Mingione³ 

[1] Department of Engineering, University of Naples ‘Parthenope’, Centro Direzionale, Isola C4, 80143 Napoli, Italy;Faculty of Metallurgy and Technology, University of Montenegro, Džordža Vašingtona bb, 81000 Podgorica, Montenegro;Laboratory for Concrete and Asphalt Chemistry, Empa Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland;

关键词: red mud;    blast-furnace slag;    construction and demolition wastes;    geopolymer-based materials;    pavement blocks;    LCA;   

DOI  :  10.3390/ma15041617

来源: DOAJ

【 摘 要 】

The aluminum Bayer production process is the most diffused process in the world, but it creates a high amount of basic waste material known as red mud (RM). The use of RM as a precursor of alkali-activated materials is one of the best opportunities for both the ecosystem and the economy. In the present work, mortar samples were obtained by alkali activation of RM with various percentages of blast-furnace slag (BFS) and inert construction and demolition sands. This process creates samples that have a low environmental impact and that can be used as an alternative in the construction industry to cement materials or ceramic ones. The development of these new materials could also represent a way to reduce the CO₂ emissions linked to cement and ceramic brick production. In the present study, cubic 40 mm samples reported very interesting values in compressive strength, with a maximum of about 70 MPa for low environmental impact mortars. With such a material, it is possible to create solid bricks for structural use and concrete tiles for road paving or use it for other purposes. Mortar specimens were prepared and characterized, and an LCA analysis with a “cradle-to-gate” approach was carried out for a comparison of the environmental impact of the studied mortars with other materials currently marketed.

【 授权许可】

Unknown