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.
Highlights
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
There are many test methods used in the laboratory to detect potential alkali-aggregate reactions (AAR)
In Brazil, the main test methods used are the petrographic analysis, the accelerated mortar bar test (AMBT - according to NBR 15577-4), and the concrete prism test (CPT - according to NBR 15577-6)
Summary
It is already known that the best solution to face AAR in concrete structures is the prevention. Several researchers around the world have developed test methods to classify the potential reactivity of aggregates in the laboratory, before their use in the field. After many years of study and development, most of the available test methods have not consistently produced reliable results and some distortions between laboratory and field behavior are often found [1]. In Brazil, the main test methods used are the petrographic analysis (according to NBR 15577-3), the accelerated mortar bar test (AMBT - according to NBR 15577-4), and the concrete prism test (CPT - according to NBR 15577-6)
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