Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation


  • Patrícia Guillante Universidade do Vale do Rio dos Sinos - Unisinos
  • Aguida Gomes de Abreu Unisinos
  • Marlova Piva Kulakowski UNISINOS
  • Maurício Mancio Unisinos
  • Claudio de Souza Kazmierczak Unisinos


Rice Husk Ash, Fired Clay Brick Waste, Alkali-Aggregate Reaction


Pozzolans rich in silica, such as Rice Husk Ash (RHA), contribute to compressive strength gain but at the same time might increase alkali-aggregate reaction (AAR) in mortar mixtures. Pozzolans that have aluminates, such as Fired Clay Brick Waste (FCW), can be efficient to mitigate AAR but tend to lead to a slower compressive strength development. The association of different types of pozzolans, however, may result in a synergistic effect, compensating individual deficiencies. This paper presents a study of mixtures containing RHA, FCW and these two materials combined, aiming to obtain benefits in the mechanical behavior and in the durability regarding AAR. A substitution rate of 20% Portland cement by pozzolanic material was used. Through accelerated AAR tests and compressive strength measurements, it was found that while RHA is considered harmful to AAR – even when using an innocuous aggregate – FCW presents benefits, also avoiding this deleterious effect when combined with RHA. The same occurs in the compressive strength development, where RHA compensates a small loss of compressive strength associated with the use of FWC alone.


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Biografia do Autor

Patrícia Guillante, Universidade do Vale do Rio dos Sinos - Unisinos

Mestranda da PPGEC-Unisinos.

Aguida Gomes de Abreu, Unisinos

Pesquisadora PPGEC - Unisinos.

Marlova Piva Kulakowski, UNISINOS

Professora Adjunta dos cursos de Engenharia Civil, Arquitetura e Urbanismo, e do Programa de Pós-graduação em Engenharia Civil.

Maurício Mancio, Unisinos

Professor do PPGEC-Unisinos

Claudio de Souza Kazmierczak, Unisinos

Professor do PPGEC - Unisinos.





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