Pozzolanicity identification in mortars by computational analysis of micrographs

Rafael G.D. Molin Filho , Jaciele M. Rosso , Eduardo A. Volnistem , Romel D. Vanderlei , Daniel A. Longhi , Rodrigo C.T. de Souza , Paulo R. Paraíso , Luiz M. de M. Jorge

Abstract

The incorporation of pozzolans to Portland cement pastes adds value in the development of new materials for the construction industry. This study presents a new computational method, complementary to the pozzolanic identification by compressive strength at 28 days method, for supporting the validation of pozzolanic mortars for non-structural purposes. An algorithm capable of classifying the pixels of micrographs of specimens fragments was developed. Therefore, comparative analyses were generated from fractional Gaussian representations in four intervals of the same amplitude that indicated the predispositions to form larger void indices (intervals 1 and 2). The results showed that the computational method indicators are in accordance with the physical and chemical indicators.

Key Words

pozzolan; mortars microstructure; micrographs computational analysis; algorithm of image analysis; new pozzolanic method

Address

Rafael G.D. Molin Filho — Department of Chemical Engineering, State University of Maringa, Av. Colombo, 5,790, D - 90, CEP 87020-900, Brazil; Advanced Campus in Jandaia do Sul, Federal University of Parana, Rua Joao Maximiano, 426, Vila Operaria, CEP 86900-000, Brazil
Jaciele M. Rosso — Department of Physics, State University of Maringa, Av. Colombo, 5790, G - 56, CEP 87020-900, Brazil
Eduardo A. Volnistem — Department of Physics, State University of Maringa, Av. Colombo, 5790, G - 56, CEP 87020-900, Brazil
Romel D. Vanderlei — Department of Civil Engineering, State University of Maringa, Av. Colombo, 5790, C - 67, CEP 87020-900, Brazil
Daniel A. Longhi — Advanced Campus in Jandaia do Sul, Federal University of Parana, Rua João Maximiano, 426, Vila Operaria, CEP 86900-000, Brazil
Rodrigo C.T. de Souza — Advanced Campus in Jandaia do Sul, Federal University of Parana, Rua João Maximiano, 426, Vila Operaria, CEP 86900-000, Brazil
Paulo R. Paraíso — Department of Chemical Engineering, State University of Maringa, Av. Colombo, 5,790, D - 90, CEP 87020-900, Brazil
Luiz M. de M. Jorge — Department of Chemical Engineering, State University of Maringa, Av. Colombo, 5,790, D - 90, CEP 87020-900, Brazil

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