Influence of polypropylene microfibre (PPMF) dispersion procedure on fresh and hardened rendering mortar properties

Authors

  • Sérgio Roberto Andrade Dantas Escola Politécnica da Universidade de São Paulo http://orcid.org/0000-0001-8942-7884
  • Ramoel Serafini Escola Politécnica da Universidade de São Paulo
  • Roberto Cesar de Oliveira Romano Escola Politécnica da Universidade de São Paulo
  • Fúlvio Vittorino Instituto de Pesquisas Tecnológicas do Estado de São Paulo - IPT
  • Kai Loh Escola Politécnica da Universidade de São Paulo

Keywords:

Engenharia Civil, Fachadas de edifícios, Argamassas de revestimento, Microfibra de Polipropileno, Retração de secagem, Processo de dispersão

Abstract

This study was carried out to evaluate the influence of a polypropylene microfibre (PPMF) dispersion procedure on fresh and hardened state properties of rendering mortars. Specimens prepared with two different PPMF dispersion procedures were evaluated comparatively with reference specimens prepared without adding PPMF. Changes in the fresh properties were monitored using flow table, squeeze flow, and air-entrainment tests. The hardened state was characterized by capillary water absorption, air-permeability, dynamic elastic modulus (E), tensile strength according to the Brazilian test, and porosity by the Archimedes immersion method. Results show that the fresh mortar properties were not affected by dispersion procedure and all hardened mortar properties were statistically similar, except for the dimensional variation of the specimens. The study also shows that adding polypropylene microfibres in a dispersed form was more effective in terms of controlling total drying shrinkage than directly adding fibres to the cementitious matrix (as recommended by the manufacturer) or the reference mortar.

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Author Biographies

Sérgio Roberto Andrade Dantas, Escola Politécnica da Universidade de São Paulo

Departamento de Engenharia Civil, área de concentração Engenharia de Construção Civil e Urbana.

Ramoel Serafini, Escola Politécnica da Universidade de São Paulo

Departamento de Engenharia Civil, área de concentração Engenharia de Construção Civil e Urbana.

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

Departamento de Engenharia Civil, área de concentração Engenharia de Construção Civil e Urbana.

Fúlvio Vittorino, Instituto de Pesquisas Tecnológicas do Estado de São Paulo - IPT

Centro Tecnológico do Ambiente Construído, Diretoria de Operações e Negócios

Kai Loh, Escola Politécnica da Universidade de São Paulo

Departamento de Engenharia Civil, área de concentração Engenharia de Construção Civil e Urbana.

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Published

2020-05-08

How to Cite

DANTAS, S. R. A.; SERAFINI, R.; ROMANO, R. C. de O.; VITTORINO, F.; LOH, K. Influence of polypropylene microfibre (PPMF) dispersion procedure on fresh and hardened rendering mortar properties. Ambiente Construído, [S. l.], v. 20, n. 2, p. 7–23, 2020. Disponível em: https://seer.ufrgs.br/index.php/ambienteconstruido/article/view/90644. Acesso em: 25 jun. 2025.

Issue

Vol. 20 No. 2 (2020)

Section

Artigos

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ISSN 1678-8621

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