Hydraulic binder obtained from recycled cement and sand powder

  • Raquel Oliveira Federal University of Minas Gerais
  • Roberto Silva Federal University of Minas Gerais
  • Enio Figueiredo Federal University of Goiás
  • Augusto Bezerra Federal Center of Technological Education of Minas Gerais
  • Maria Aguilar Federal University of Minas Gerais
  • Paulo Roberto Cetlin Federal University of Minas Gerais

Resumo

Currently, we have sought to obtain eco-efficient concretes through the recycling of concrete residues. Literature studies have shown that pulp heating can remove water from hydration and that quartz sand can act as supplementary cementitious material when appropriate granulometry. However, there are virtually no reports of reuse of these materials as alternative binders. This work evaluates the phases present in cementitious compounds made with binder obtained from the thermomechanical treatment of slurries with 15% quartz sand powder (RCQ) and without substitution (RC) with a specific surface area of 37.4 m²/g. Thermogravimetric analyzes were performed with the analysis of stripped gases, X - ray diffraction and scanning electron microscopy with phase identification. The obtained data show that the RC paste has a predominant microstructure of ettringite whereas in the RCQ paste the presence of calcium hydroxide and hydrated calcium silicate predominates.

Biografia do Autor

Raquel Oliveira, Federal University of Minas Gerais
Doctor student,Department of Engineering of Structures.
Roberto Silva, Federal University of Minas Gerais
Teacher, Department of Engineering of Structures
Enio Figueiredo, Federal University of Goiás
Teacher, School of Civil and Environmental Engineering
Augusto Bezerra, Federal Center of Technological Education of Minas Gerais
Teacher, Department of Transport Engineering.
Maria Aguilar, Federal University of Minas Gerais
Teacher, Department of Engineering of Materials and Construction
Paulo Roberto Cetlin, Federal University of Minas Gerais
Teacher, Department of Mechanical Engineering
Publicado
2018-11-23
Seção
Articles