Effectiveness of in situ moisture preconditioning methods for concrete

Muhammed Basheer, E.A. Nolan, W.J. McCarter, Adrian Long

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    With greater emphasis now being placed on the durability of concrete and the need for on-site characterization of concrete for durability, there is an increasing dependence on the measurement of the permeation properties of concrete. Such properties can be measured in the laboratory under controlled ambient conditions, namely, temperature and relative humidity, and comparisons made between samples not affected by testing conditions. An important factor that influences permeation measurements is the moisture state of the concrete prior to testing. Moisture gradients are known to exist in exposed concretes; therefore, all laboratory tests are generally carried out after preconditioning to a reference moisture state. This is reasonably easy to achieve in the laboratory, but more difficult to carry out on-site. Different methods of surface preconditioning in situ concrete are available; however, there is no general agreement on the suitability of any one method. Therefore, a comprehensive set of experiments was carried out with four different preconditioning methods. Results from these investigations indicated that only superficial drying could be achieved by using any of the preconditioning methods investigated and that significant moisture movement below a depth of 15 mm was not evident.
    Original languageEnglish
    Pages (from-to)131-138
    Number of pages8
    JournalJournal of Materials in Civil Engineering
    Volume12
    Issue number2
    Publication statusPublished - 2000

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Building and Construction
    • Materials Science(all)

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