Fabrication, microstructure, and properties offired clay bricks usingconstruction and demolition waste sludge as the main additive

• Autor(a) principal: Reis, Glaydson Simões dos
• Data de Publicação: 2020
• Outros Autores: Cazacliu, Bogdan, Cothenet, Alexis, Poullain, Philippe, Wilhelm, Michaela, Sampaio, Carlos Hoffmann, Lima, Éder Cláudio, Ambrós, Weslei Monteiro, Torrenti, Jean-Michel
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/223351
• topic: Tijolos; Reciclagem do lodo; Resíduos da construção civil; Recycling and valorization; Construction and demolition waste sludge; Bricks production; Mechanical properties; Insulation properties

Green routes to prepare or manufacture sustainable building materials have been attracting muchattention over the years targeting sustainability issues. In this investigation, for thefirst time, sludgefrom the inert mineral part of the construction and demolition waste (RA-S) is used as a primary rawmaterial in the fabrication offired bricks for building purposes. Fired bricks fabricated with differentdosages of RA-S and earth material (i.e., 0%, 30%, 50%, 70%, and 100% by weight) were prepared andevaluated in terms of their physical-chemical properties. The RA-S was characterized, and the resultsshowed that it could be classified as a clayey material and richly graded silty sand according to the FrenchStandards. XRD analysis revealed that the addition of the RA sludge into raw earth material provokedchanges slightly in thefired bricks. The compressive strength (CS) results indicated that the CS of thefired bricks increased with the addition of the RA-S from 30% to 70%. The highest CS was attained at thefiring temperature of 800 C. The density of thefired brick slightly reduced with the RA-S addition. Thethermal conductivity results suggest that RA-S has better insulation properties compared to earth ma-terial. The RA-S sludge can be used in combination with earth material to fabricatefired bricks, which canmeet the requirements of many Standards all over the World.In the light of these results, it is possible to say that the RA-S generated from recycling inert mineralpart of construction and demolition waste plant is an excellent raw material to prepare efficientfiredbricks that can be successfully employed in the real construction sector. Also, the highlighted resultssuggest that brickwork factories have the opportunity to improve production quality while significantlyreducing manufacturing time, energy consumption, resource depletion, and environmental impact.