Macroporous Mortars for Laying and Coating

Authors

  • Júlia Castro Mendes
  • Paloma Bárbara Pinto
  • Henrique Emanuel Américo da Silva
  • Rodrigo Rony Barreto
  • Taís  Kuster Moro
  • Ricardo André Fiorotti Peixoto

DOI:

https://doi.org/10.7764/RDLC.18.1.29

Keywords:

Air-entraining admixture, Mortars, Macroporus cement-based composites, Capillarity, Built environment

Abstract

The envelope of a building is responsible for its physical protection against external agents, including humidity and temperature. Thus, the present work seeks to evaluate the effect of air entraining admixtures (AEA) in mortars for laying and coating to improve their physical and thermal performances. The AEA generates macropores, interrupting the system of canaliculi that allows the capillary absorption of water. The AEA used is based on biodegradable surfactant molecules of Linear Alkyl Benzene Sodium Sulfonate. Results compare physical tests (water absorption, capillary coefficient, specific gravity, and mechanical strength), and thermal evaluation (thermal conductivity and specific heat) from two mortars mixtures with varying levels of AEA. Scanning electron microscopy (SEM) of the pore system were also analysed. All mixtures studied presented higher workability and cohesion, reduced thermal conductivity, decreased specific heat, and a reduction in the effects of water absorption, capillary elevation and specific gravity (density). In this sense, the durability of mortars to humidity effect is potentially improved, along with several other properties. Therefore, this work seeks to contribute to the quality of built environments, as well as to promote the technological development of cement-based composites.

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Author Biographies

Júlia Castro Mendes

Laboratório de Materiais de Construção Civil, Escola de Minas, Universidade Federal de Ouro Preto – Campus Morro do Cruzeiro
Ouro Preto - MG, 35400-000 (Brasil)

Paloma Bárbara Pinto

Departamento de Engenharia Civil, Faculdade Santa Rita (FaSaR)
KM 2 da Estrada Real, Conselheiro Lafaiete - MG, 36400-000 (Brasil)

Henrique Emanuel Américo da Silva

Laboratório de Materiais de Construção Civil, Escola de Minas, Universidade Federal de Ouro Preto – Campus Morro do Cruzeiro
Ouro Preto – MG, 35400-000 (Brasil)

Rodrigo Rony Barreto

Laboratório de Materiais de Construção Civil, Escola de Minas, Universidade Federal de Ouro Preto – Campus Morro do Cruzeiro
Ouro Preto – MG, 35400-000 (Brasil)

Taís  Kuster Moro

Laboratório de Materiais de Construção Civil, Escola de Minas, Universidade Federal de Ouro Preto – Campus Morro do Cruzeiro
Ouro Preto – MG, 35400-000 (Brasil)

Ricardo André Fiorotti Peixoto

 Laboratório de Materiais de Construção Civil, Escola de Minas, Universidade Federal de Ouro Preto – Campus Morro do Cruzeiro
Ouro Preto – MG, 35400-000 (Brasil)

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Published

2019-04-30

How to Cite

Castro Mendes, J., Pinto, P. B., da Silva, H. E. A., Barreto, R. R., Kuster Moro, T., & Fiorotti Peixoto, R. A. (2019). Macroporous Mortars for Laying and Coating. Revista De La Construcción. Journal of Construction, 18(1), 29–41. https://doi.org/10.7764/RDLC.18.1.29