Evaluation of rheological properties of mortar with TiO2 addition

Autores

Palavras-chave:

Photocatalytic mortar, TiO2, squeeze flow, rheology, yield.

Resumo

Adding TiO2 to coating mortars is carried out to promote self-cleaning through photocatalytic activity. However, this addition influences the workability of the mortar and, consequently, the application stage as the TiO2 used can present a large number of fine particles and a high surface area, increasing the demand for mixing water, requiring consistency adjustments before coating. In this work, three mortars (two with the addition of different types of TiO2 and one reference) were developed on a laboratory scale to maintain similar workability, using the flow table test. The amount of kneading water was changed to maintain a spread of 220 ± 10 mm and the content of air-entrained was kept constant, around 25%. The mortars were evaluated using the squeeze flow method. Then, a blind test was performed to assess the mason sensitivity during handling and application of the coating, and all mortars were considered similar. However, the yield of the compositions with TiO2 addition was lower compared to the reference composition, making it possible to explain the results based on the physical parameters of the formulations and with a more in-depth analysis of the rheological indices obtained by the squeeze flow test.

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Biografia do Autor

Sérgio Roberto Andrade Dantas, Instituto de Pesquisas Tecnológicas do Estado de São Paulo - IPT

Arquiteto e Urbanista

Especialista em Excelência Construtiva e Anomalias

Especialista em História da Arte

Mestre em Habitação - Gestão e Tecnologia

Francisco Jordão Nunes de Lima, Escola Politécnica da Universidade de São Paulo

Mestrando no programa Engenharia Civil, área de concentração Engenharia de Construção Civil e Urbana.

Roberto Cesar de Oliveira Romano, Escola Politécnica da Universidade de São Paulo

Pesquisador no programa Engenharia Civil

Rafael Pileggi, Escola Politécnica da Universidade de São Paulo

Professor/Pesquisador no programa Engenharia Civil

Kai Loh, Escola Politécnica da Universidade de São Paulo

Pesquisadora no programa Engenharia Civil

Publicado

2021-08-09

Edição

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