Sericitic Phyllite as Addition in Portland Cement

Abstract:

Pozzolans are materials that when milled are able to react with the cement, forming compounds with binder properties. Seeking to reduce costs and improve Portland cement performance, the cement industry has used mineral additions such as pozzolans, partially replacing clinker in Portland cement. Sericitic Phyllite is a metamorphic rock, considered sterile by iron mining. It is extracted from the pit to enable the extraction of iron ore and is disposed in sterile piles, representing an environmental liability. The present work evaluated the possibility of the Sericitic Phyllite acquires pozzolanic properties from thermal treatment, to be used as mineral addition in the partial substitution of Portland cement in mortars. The material was processed by milling in its natural moisture of 8% using a high performance planetary mill, and calcination in an electric resistance furnace at different temperatures (350, 550 and 850oC) for thirty minutes each. It was characterized by laser granulometry, X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential thermal and thermogravimetric analysis (DTA/TGA). After characterization, specimens were prepared with 25% substitution by weight of the Portland cement by the Sericitic Phyllite. The calcined material in 350, 550 and 850oC reached, respectively, 70%, 76% and 82% of the resistance of the control mortar. The results indicate the feasibility of using the Sericitic Phyllite as mineral addition in Portland cements as the mortars with the calcined material in all temperatures reached 32MPa.

• Periodical: Materials Science Forum (Volume 930)
• Pages: 131-136
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.930.131
• Online since: September 2018
• Authors: Isabella de Souza Morais, Luciano Fernandes de Magalhães, Luis Felipe dos Santos Lara, Elaine Carballo Siqueira Corrêa, Raquel Maria Rocha Oliveira Menezes, Maria Teresa Paulino de Aguilar, Augusto Cesar da Silva Bezerra*
• Keywords: Carbon Footprint, Mineral Addition, Non-Conventional Materials, Portland Cement, Sustainability

References

[1] P.M. Metha, P.J.M. Monteiro: Concreto: Microestrutura, Propriedades e Materiais. (2ª. ed. São Paulo, 2014).

[2] G.C. Isaia: Concreto: Ciência e Tecnologia. (Ibracon São Paulo, 2011).

[3] Associação Brasileira De Normas Técnicas. Materiais Pozolânicos – Requisitos. Rio de Janeiro: ABNT (2014). (NBR 12653).

[4] J.A.G. Matteo: Aplicação como pozolanas artificiais de alteritas e argilas sedimentares do município de Itaú de Minas, MG. Mestrado (Dissertação). São Paulo, 2005. Universidade de São Paulo (USP). (SP).

DOI: 10.11606/d.44.2005.tde-05102015-104819

[5] J.A. Matos Neto et al.:Mat. Res. Vol. 18 (2) (2015), p.230. [online], http://dx.doi.org/10.1590/1516-1439.367014.

[6] Associação Brasileira de Normas Técnicas. Cimento Portland de alta resistência inicial. Rio de Janeiro: ABNT 1991. (NBR 5733).

[7] Associação Brasileira de Normas Técnicas. Materiais Pozolânicos – Determinação do índice de desempenho com cimento Portland. Rio de Janeiro: ABNT 2014. (NBR 5752).

[8] Associação Brasileira de Normas Técnicas. Cimento Portland – Determinação da resistência à compressão – Método de ensaio. Rio de Janeiro: ABNT 1996. (NBR 7215).

[9] A.C.S. Bezerra et al.: Matéria Vol. 22 (1) (2017).

[10] ASTM C618-12a Standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete (2012).

DOI: 10.1520/c0618-99

[11] Associação Brasileira de Normas Técnicas. Cimento Portland pozolanico. Rio de Janeiro: ABNT 1991. (NBR 5736).