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    Kinetics comparison of alkali-reactivity tests for aggregates

    TitleKinetics comparison of alkali-reactivity tests for aggregates
    Publication TypePapers in International Journals
    Year of Publication2015
    AuthorsGonzalez L. M., Santos Silva A., and Jalali S.
    Abstract

    Among the test-methods for evaluation of aggregates reactivity towards alkali-silica
    reaction (ASR), linear dilatation of mortar bars or concrete prisms is often used in several tests
    under various conditions, criteria and procedures of measuring and accelerating the reaction. As
    reactivity is an essentially kinetic property, the expansion limits in such tests, or even tests results
    for the same aggregate, should be kinetically inter-related.
    This paper presents a proposal of a kinetic relationship for critical reaction rates, evaluated from
    criteria of standard test-methods NF P 18-590, ASTM C 1260 and ASTM C 1293 . To do so, the
    critical expansion rate of these tests were corrected for a reference 1M alkalinity and depicted as
    Arrhenius plot. The high correlation of the regression line shows linearity of the plotted data, which
    was assumed as a criterion of kinetic compatibility between the said tests.
    The discussion includes a comparison with other tests and literature comments on their evaluation.
    The main interest of this study concernong the potential for ASR, is to discuss and compare
    methods aiming to improve the service life of concrete structures, by:
    i) selection of good materials;
    ii) decisions on the appropriate concrete formulation;
    iii) foreseeing possible problems allowing to plan monitoring and/or the need for adequate
    intervention as well as the possibility of test improvements.
    The extension of service life allows savings in raw materials and energy, improvement of the
    investment economics and, in the long term, lower investment requirements.

    JournalKey Engineering Materials
    Volume634
    Pagination506-516
    Date Published2015-02-01
    PublisherTrans Tech Publications Ltd
    ISSN10139826
    DOIdoi:10.4028/www.scientific.net/KEM.634.506
    KeywordsAggregates, alkali-silica reaction, Expansion tests, reactivity
    RightsopenAccess
    Peer reviewedyes
    Statuspublished
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    About CTAC

    The Centre for Territory, Environment and Construction (CTAC) is a research unit of the School of Engineering of University of Minho (UMinho), recognised by the “FCT – Fundação para a Ciência e Tecnologia” (Foundation for Science and Technology), associated to the Department of Civil Engineering (DEC), with whom it shares resources and namely human resources.

    Currently CTAC aggregates 37 researchers holding a PhD of which 27 are faculty professors of the Civil Engineering Department. Read more


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