Characterization of demolished concretes with three different strengths for recycling as coarse aggregate

• Autor(a) principal: Sampaio, Carlos Hoffmann
• Data de Publicação: 2021
• Outros Autores: Cazacliu, Bogdan, Ambrós, Weslei Monteiro, Kronbauer, Márcio André, Tubino, Rejane Maria Candiota, Dal Molin, Denise Carpena Coitinho, Oliva Moncunill, Josep, Miltzarek, Gerson Luis, Waskow, Régis Pereira, Santos, Viviane Lopes Gschwenter dos, Silva, Luis Felipe Oliveira
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/230189
• topic: Resíduos da construção civil; Agregados para construção civil; Concreto; Concrete; Recycling; Density distribution; Liberation; Gravity concentration

This paper presents a physical characterization for the recycling into new concretes of three comminuted concretes: C16/20 (“ordinary concrete”), C50/60 (“high strength concrete”), and C70/85 (“very high strength concrete”). The top size of the crushed concretes was 19.1 mm and the size range was 4.75 to 19.1 mm. The characterization was carried out with coarse aggregate liberation, to be prepared and concentrated in a gravity concentration process. The density distribution of the coarse aggregate, cement paste, and sand was carried out in different size ranges (4.75/19.1 mm; 4.75/8.0 mm; 8.0/12.5 mm; and 12.5/19.1 mm) for the three concretes studied. The form factor of the samples, as well as the porosity determination of particles in different density ranges, are presented. The obtained results indicate that the coarse aggregate liberation was more intensive for the low resistance concrete (C16/20), but a reasonable coarse aggregate recovery is possible for all concretes.