Alkali-Activated Fly Ashes: Influence of Curing Conditions on Mechanical Strength

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Filipe Almeida
Nuno Cristelo
Tiago Miranda
Castorina S. Vieira
Maria de Lurdes Lopes
Fernando Castro

Abstract

Alkaline activation of fly ashes is a procedure that enables an alternative binder which has been receiving much interest by several research groups particularly on the manufacturing of mortars and concretes. The properties of the materials that are developed during the alkaline activation are influenced by the curing conditions (temperature and relative humidity). Another relevant facet related to the curing procedures is the possibility of carbonation occur, which may have an impact on the mechanical strength of the alkaline cements. In this research, several sets of curing conditions were tested to understand which one results in a higher strength and reveals carbonation. Uniaxial compressive strength tests were conducted to assess mechanical behavior. The outcome suggests that higher temperature and low relative humidity yields higher mechanical strength.

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Author Biographies

Filipe Almeida, Universidade do Porto

Departamento de Engenharia Civil

Faculdade de Engenharia

Universidade do Porto

Rua Dr. Roberto Frias

4200-465 PORTO

Portugal

Nuno Cristelo, Universidade de Trás-os-Montes e Alto Douro

Departamento de Engenharias

Escola de Ciências e Tecnologia

Universidade de Trás-os-Montes e Alto Douro

Quinta de Prados - Pólo I da ECT

5000-801 VILA REAL

Portugal

Tiago Miranda, Universidade do Minho

Departamento de Engenharia Civil

Universidade do Minho

Campus de Azurém

4800-058 GUIMARÃES

Portugal

Castorina S. Vieira, Universidade do Porto

CONSTRUCT-GEO

Departamento de Engenharia Civil

Faculdade de Engenharia

Universidade do Porto

Rua Dr. Roberto Frias

4200-465 PORTO

Portugal

Maria de Lurdes Lopes, Universidade do Porto

CONSTRUCT-GEO

Departamento de Engenharia Civil

Faculdade de Engenharia

Universidade do Porto

Rua Dr. Roberto Frias

4200-465 PORTO

Portugal

Fernando Castro, Universidade do Minho

Departamento de Engenharia Mecânica

Universidade do Minho

Campus de Azurém

4800-058 GUIMARÃES

Portugal