Physicochemical evaluation of Portland cement produced in Brazil via X-ray fluorescence and mechanical strength

Dawilson Menna Junior, Victor Manuel Cardoso Figueiredo Balcão, Marco Vinicius Chaud, Marta Maria Duarte Carvalho Vila, Norberto Aranha, Valquiria Miwa Hanai Yoshida, Jose Martins de Oliveira Junior

Abstract


Portland cement is the basic component of concrete. X-ray fluorescence spectroscopy is an established analytical technique used in cement plants throughout the world. A comparative study of the elemental constituents presents in Portland cements produced in Brazil was carried out via EDXRF analyses. The main elements identified and quantified in cement samples were Al, Ca, Fe, K, Si, S, Ti, Mn, Zn and Sr. The main components of cement are lime (CaO), silica (SiO2), alumina (Al2O3), iron oxide (Fe2O3), magnesia (MgO), alkalis (Na2O and K2O ) and sulfates (SO3). The components C3S, C2S, C3A and C4AF were calculated via Bogue’s formula. Mortar with water, cement and sand was produced for each cement brand, and analyses were performed in order to evaluate the mechanical compressive strength. The bodies were broken after curing over the following timeframes: 1, 3, 7, 28 and 91 days. The results from mechanical tests were correlated with the components found in the different cement brands. Our results indicate that initial compressive strength can vary greatly from one brand to another and the values for the Bogue’s potentials show large differences for C3S and C2S. It was showed by strength tests, how it is possible to predict the behavior of mortars made with these cements. Cements proved to be good for the manufacture of mortars and meet the Brazilian’s specifications.


Keywords


EDXRF. Portland Cement. Mechanical resistance. Bogue’s potential.

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DOI: http://dx.doi.org/10.5433/1679-0375.2020v41n1p3

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Semin., Ciênc. Exatas Tecnol.
Londrina - PR - Brazil
E-ISSN: 16790375
DOI: 10.5433/1679-0375
Email: seminaexatas@uel.br
 
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