Eco-efficient steel slag concrete for precast industry

• Autor(a) principal: Martins, Ana Carolina Pereira
• Data de Publicação: 2021
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: https://locus.ufv.br//handle/123456789/28085
• topic: Aço - Indústria - Reaproveitamento; Indústria de construção civil - Subprodutos; Compósitos de cimento; Materiais e Componentes de Construção

The construction industry is one of the greatest consumers of natural resources, besides being responsible for about 25% of the solid waste generated worldwide. Sustainability actions have been discussed since the 1990s to save increasingly scarce natural resources. The search for industrial by-products that can perform as binders and as recyclable aggregates, replacing Portland cement and natural aggregates in cement matrices, are important mitigation routes, providing a destination for environmental liabilities in a circular economy structure. Within this context, the steel industry represents a high generation of industrial waste and by-products, about 90% of which are slag. Thus, powder and aggregates from steel slag were produced, and these materials were incorporated into cement-based composites such as pastes, mortars, and no-slump concrete for the precast industry. A characterization program was conducted to evaluate hydration kinetics, mineralogical phase formation, physical, morphological and mechanical performance. It was verified the great potential for using these by-products, especially in no-slump concrete, improving the physical and mechanical properties and the eco- efficiency of the matrices with the incorporation of waste. Keywords: Industrial by-products. Steel slag. Cement-based composites. Eco-efficiency. No- slump concrete.