Volume 16, Issue 1 (June 1994)

    Limits of Application of the ASTM C 2274 Mortar Bar Test. Comparison with Two Other Standards on Alkali Aggregate Reactivity

    CODEN: CCAOAD

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    Abstract

    Mortar bar expansion tests sometimes provide unreliable data concerning the potential reactivity of aggregates in an alkaline medium. The most widely used mortar bar test, known as the Test Method for Potential Alkali Reactivity of Cement-Aggregate Combinations (Mortar Bar Method) (ASTM C 227) is a case in point. The alkali-carbonate reaction, which is outside the scope of this standard, will not be discussed in this paper. The procedure related to the storage conditions and the leaching of the alkalies from the bars have been the subject of several recent papers. The investigation presented in this paper covers six deleteriously expansive coarse aggregates, which were correctly evaluated when tested in concrete prisms, but not in mortar bars. The Test Method for Potential Reactivity of Aggregates (Chemical Method) (ASTM C 289) has also been used but was not found to be reliable. Based on data developed from the above tests and a complete petrographic examination, it is concluded that reducing the particle size of the materials as required in the mortar bar test contributes to a decrease in expansion.


    Author Information:

    Sorrentino, D
    Research engineer and senior research scientist, Lafarge Coppée Recherche, Viviers,

    Isabelle, H
    Consultant, Corporate Technical Services, Lafarge Canada, Inc., Montréal, Quebec

    Yves Clément, J
    Research engineer and senior research scientist, Lafarge Coppée Recherche, Viviers,

    Ranc, R
    Manager, Quality and Products, Direction des Performances Cimentières, Lafarge Coppée, La Verpillière Cedex,


    Stock #: CCA10564J

    ISSN: 0149-6123

    DOI: 10.1520/CCA10564J

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    Author
    Title Limits of Application of the ASTM C 2274 Mortar Bar Test. Comparison with Two Other Standards on Alkali Aggregate Reactivity
    Symposium , 0000-00-00
    Committee C01