An investigation on the physical properties of cementitious pastes modified with low dosage of waste glass powder and silica fume.

Autor:	Patriota ALS; Instituto Federal de Educação, Ciência e Tecnologia do Sertão Pernambucano, Departamento de Construção Civil, Campus Salgueiro, BR-232, Km 508, s/n, Zona Rural, 56000-000 Salgueiro, PE, Brazil.; Programa de Pós-Graduação em Engenharia Civil, Universidade Federal de Pernambuco, Avenida da Arquitetura, s/n, Cidade Universitária, 50740-550 Recife, PE, Brazil., Barros FBM; Programa de Pós-Graduação em Engenharia Civil, Universidade Federal de Pernambuco, Avenida da Arquitetura, s/n, Cidade Universitária, 50740-550 Recife, PE, Brazil.; Universidade Federal de Pernambuco, Departamento de Engenharia de Minas, Avenida da Arquitetura, s/n, Cidade Universitária, 50740-550 Recife, PE, Brazil., Carneiro AMP; Programa de Pós-Graduação em Engenharia Civil, Universidade Federal de Pernambuco, Avenida da Arquitetura, s/n, Cidade Universitária, 50740-550 Recife, PE, Brazil.; Universidade Federal de Pernambuco, Departamento de Engenharia Civil, Avenida da Arquitetura, s/n, Cidade Universitária, 50740-550 Recife, PE, Brazil., Guzzo PL; Universidade Federal de Pernambuco, Departamento de Engenharia de Minas, Avenida da Arquitetura, s/n, Cidade Universitária, 50740-550 Recife, PE, Brazil.
Jazyk:	angličtina
Zdroj:	Anais da Academia Brasileira de Ciencias [An Acad Bras Cienc] 2024 Aug 23; Vol. 96 (3), pp. e20231153. Date of Electronic Publication: 2024 Aug 23 (Print Publication: 2024).
DOI:	10.1590/0001-3765202420231153
Abstrakt:	Portland cement (PC) production is among the industrial activities that most emit harmful gases. Its replacement to green binders turns into a timely issue to face the global restrictions due to climate changes. In this study, some properties of cementitious pastes prepared with waste packing glass powder (GP) and silica fume (SF) were characterized in line with a prefixed alkaline equivalent limit. These materials were obtained in Northeastern Brazil. Grinding operations used to produce GP into four size ranges ([45-75] µm, < 45 µm; [25-45] µm, < 25 µm) were disclosed. X ray diffraction showed that GP and SF substitutions did not change the hydration products commonly observed in PC pastes. The portlandite content measured with thermogravimetry was affected by GP size in both unitary and binary substitutions. The compressive strength measured after 56 days of curing was dependent on portlandite and void index contents measured in hardened pastes. Scanning electron microscopy coupled to energy dispersive spectroscopy were useful to show the effect of the particle size on the pozzolanic activity. It was found that 5% of PC replacement for GP < 25 µm was enough to raise the compressive strength by ~5%. For binary substitution, the strength increasing was ~ 20 %. The collectors of solid residues are the main players of waste glass recycling in Brazil. It is expected that the results of this study contribute to take out these workers from the fringes of the citizenship.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu