Evaluation of Alkali-Silica Reactivity Using Aggregate Geology, Expansion Limits of Mortar Bars and Concrete Prisms, and Kinetic Model

Mohammad S. Islam, Nader Ghafoori

Abstract


The main objective of this study was to evaluate and classify the alkali-silica reactivity of thirteen aggregate groups using aggregate geology, and early and extended expansion limits of mortar bars and concrete prisms submerged in the 1N NaOH for 4, 8 and 13 weeks. The previously suggested ASR kinetic model, known as Kolmogorov-Avrami-Mehl-Johnson (K-A-M-J) model, was fitted with the prism expansion data over the test durations of 4, 8 and 13 weeks, and a new failure criteria was developed to better predict the degree of reactivity of the trial aggregates. The ASR classifications of the investigated aggregates evaluated by the failure criteria of alkali-cured prisms and ASR kinetic model were in good agreement with the results generated from the failure limits of mortar bars and from aggregate potential reactivity based on aggregate type.


Full Text: PDF DOI: 10.5539/jmsr.v2n2p103

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Journal of Materials Science Research   ISSN 1927-0585 (Print)   ISSN 1927-0593 (Online)

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