Data/hora: 07/06/2024 13:57:49

Biblioteca(s): 	Embrapa Instrumentação.	
Data corrente: 	26/09/2023	
Data da última atualização: 	15/01/2024	
Autoria: 	TERRA, I. C. C.; BATISTA, F. G.; SILVA, D. W.; SCATOLINO, M. V.; ALVES JÚNIOR, F. T.; MARTINS, M. A.; MENDES, L. M.	
Afiliação: 	Department of Forest Science, Federal University of Lavras (UFLA); Department of Forest Science, Federal University of Lavras (UFLA); Department of Production Engineering, State University of Amapá (UEAP); Graduate Program in Development and Environment, Federal University of the Semiarid Region (UFERSA); Department of Production Engineering, State University of Amapá (UEAP); MARIA ALICE MARTINS, CNPDIA; Department of Forest Science, Federal University of Lavras (UFLA).	
Título: 	Mining waste and coconut fibers as an eco-friendly reinforcement for the production of concrete blocks.	
Ano de publicação: 	2023	
Fonte/Imprenta: 	Environmental Science and Pollution Research, v. 30, 2023. 62641?62652	
Páginas: 	62641-62652	
DOI: 	https://doi.org/10.1007/s11356-023-26493-5	
Idioma: 	Inglês	
Conteúdo: 	Using mineral and agro-industrial wastes associated with the cement matrix can add value and guarantee suitable properties for reinforced composites. This research aimed to evaluate the effect of the incorporation of quartzite and coconut fibers on masonry blocks' physical, mechanical, and thermal properties. Quartzite was evaluated replacing 0%, 25%, 50%, 75%, and 100% of the sand, whereas the coconut fibers were added in a proportion of 2.5% of the volume of gravel. Quartzite residues were analyzed regarding their granulometry, chemical composition, and pozzolanicity. The block initial formulation (control) was: 8.2% cement, 45.9% sand, and 45.9% gravel. The cement was cured at room temperature for 28 days. Subsequently, the blocks were subjected to the characterization of physical, mechanical, and thermal properties. Coconut fibers presented a low percentage of extractives, with a low inhibition index (1.93%), reducing their effect on cement hardening. The increase in the content of quartzite incorporated provided a reduction in bulk density and an increase in porosity (from 11.7 to 16.0%) and water absorption after 24 h (from 7.0 to 8.5%). The compressive strength was reduced from 50% with the insertion of the quartzite. The quartzite and coconut fibers reduced the concrete's thermal conductivity, providing essential reflections for the performance of the blocks in terms of thermal comfort in built environments. Further, incorporating these materials provided the potential to obtain blocks with characteristics of resistance and offering possible thermal comfort, besides contributing as an option for a destination for these mineral and agro-industrial wastes.	
Palavras-Chave: 	Block characterization; Composite; Lignocellulosic fibers; Mining wastes; Quartzite.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Instrumentação (CNPDIA)	
Exemplares: 	CNPDIA - (18284-1) - UPC - AP - DD - PROCI.23/91 -  - 2023/96 - DIS