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Revista IBRACON de Estruturas e Materiais

On-line version ISSN 1983-4195

Rev. IBRACON Estrut. Mater. vol.4 no.4 São Paulo Oct. 2011

http://dx.doi.org/10.1590/S1983-41952011000400004 

Using the accelerated Brazilian concrete prism test (ABCPT) to evaluate alkali aggregate reaction (AAR)

 

Uso do método acelerado brasileiro de prismas de concreto (ABCPT) para avaliação da reação álcali-agregado (RAA)

 

 

L. SanchezI; S. C. KupermanII; P. HeleneIII

IU. LAVAL – Doutorando da Université Laval
IIDesek – Desek Ltda.
IIIUSP – University of São Paulo
IIIPhD – PhD Engenharia e Consultoria Ltda

 

 


RESUMO

Existem muitos métodos de ensaio de laboratório utilizados na prevenção da reação álcali-agregado, entretanto, até o momento não existe consenso no que tange confiabilidade e eficiência destes. Este trabalho apresenta a tentativa de desenvolvimento de um novo método de ensaio acelerado denominado ABCPT (método acelerado brasileiro de prismas de concreto), com o intuito de que este possa, de maneira rápida e confiável, analisar e classificar agregados mediante a sua potencial reatividade em laboratório. Para o desenvolvimento desta pesquisa, foram utilizados seis litotipos diferentes de agregados. Os métodos CPT (método de prismas de concreto), ACPT (método acelerado de prismas de concreto) e ABCPT foram realizados com todos os agregados e após, uma análise comparativa foi realizada. Os resultados indicam que o ABCPT demonstra grande potencial para utilização na análise e classificação de agregados em obras correntes de engenharia. No entanto, para a sua real comprovação, torna-se muito importante a realização do ensaio com um maior número de amostras de diferentes litotipos.

Palavras-chave: reação álcali-agregado, métodos de ensaio, método de prismas de concreto (CPT), método acelerado brasileiro de prismas de concreto (ABCPT).


ABSTRACT

There are many test methods used in the laboratory to detect potential alkali-aggregate reactions (AAR). However, up to now, there is no consensus if they are reliable and efficient. This work presents the development of a new and accelerated concrete prism test called ABCPT (accelerate Brazilian concrete prism test) as an attempt to create a reliable and fast test that can analyze and classify the potential reactivity of aggregates in the laboratory. For this research, six aggregates from different lithotypes were used. The methods CPT, ACPT and ABCPT were carried out with all the aggregates and a comparative analysis among all tests was performed. ABCPT seems to have a great potential to analyze and classify aggregates in the laboratory, although it needs further testing with other lithotypes to be confirmed as feasible.

Keywords: alkali-aggregate reaction, test methods, concrete prism test (CPT), accelerated Brazilian concrete prism test (ABCPT).


 

 

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REFERÊNCIAS BIBLIOGRÁFICAS

01 SWAMY, R. N. The alkali-silica reaction in concrete. Book. 1992, London, England.         [ Links ]

02 OBERHOLSTER, R.E.; DAVIES, G. An Accelerated Method for testing The Potential Alkali Reactivity of Siliceous Aggregates. Cement and Concrete Research, vol. 16, pp. 181-189, 1986.         [ Links ]

03 SANCHEZ, L.F.M., KUPERMAN, S.C., HELENE, P.R.L., KIHARA, Y. Trials to correlate the accelerated mortar bar test, the standard and the accelerated concrete prism tests. 13th Internacional conference on alkali-aggregate reaction (ICAAR), Norway, June, 2008.         [ Links ]

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11 ANDRADE, T. Historical AAR cases occurred on buildings from the metropolitan area of Recife. AAR 2006 - II Symposium on Alkali-Aggregate Reaction in Concrete Structures . Rio de Janeiro, September 2006 (Ibracon).         [ Links ]

12 Gitahy, H. S. O problema dos agregados para os concretos da barragem de Jupiá. IPT - Instituto de Pesquisas Tecnológicas do Estado de Sao Paulo, Março, 1963.         [ Links ]

 

 

Received: 09 Apr 2010
Accepted: 29 May 2011
Available Online: 07 Oct 2011

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