STP930: Influence of Alkali-Silica Reaction on the Engineering Properties of Concrete

    Swamy, RN
    Reader and Research Student, University of Sheffield, Sheffield,

    Al-Asali, MM
    Reader and Research Student, University of Sheffield, Sheffield,

    Pages: 18    Published: Jan 1986


    Abstract

    Tests were conducted to quantify the effect of alkali-silica reaction on the properties of concrete. Two reactive aggregates, Beltane opal and an amorphous fused silica, were used to simulate the reaction in the laboratory. At 0.1% expansion, concrete containing 5.2 kg/m3 equivalent sodium oxide showed a loss of 12% compressive strength but 50% tensile strength. The compressive strength was not found to be a good indicator of alkali-silica reaction, but the modulus of rupture test proved to be a sensitive and reliable test to identify the progress of the reaction. Dynamic modulus and pulse velocity also appear to be good indicators of alkali-silica reaction. The tests suggest that fused silica is an ideal reactive aggregate to simulate expansion due to alkali-silica reaction, and that it provides an effective means of determining the deterioration in concrete properties and in evaluating mineral admixtures to control expansion.

    Keywords:

    durability, alkali-silica reaction, concrete, physical properties, expansion, compressive strength, tensile strength, elastic modulus, reactive aggregates, long-term strength


    Paper ID: STP18465S

    Committee/Subcommittee: C09.23

    DOI: 10.1520/STP18465S


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