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    Expanded study on the effects of aggregate coating and films on concrete performance

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    File(s)
    Final report (1.981Mb)
    Date
    2007-09
    Author
    Cramer, Steven
    Munoz, Jose F.
    Tejedor, M. Isabel
    Publisher
    Wisconsin Highway Research Program
    Metadata
    Show full item record
    Abstract
    The WisDOT sponsored study entitled: "Effects of Aggregate Coatings and Films on Concrete Performance", ID: 0092-00-07, found that clay coatings showed a deleterious impact in concrete compared with other microfine mineralogy such as dust or carbonates. The principal aim of this research was to complement the previous project by identifying the primary variables that govern the effects of clay microfine coatings on concrete pavements and to use this knowledge to improve the present aggregate monitoring situation in Wisconsin. The materials selected for this research were two naturally-coated igneous aggregates located near Eau Claire and an igneous clean coarse aggregate from Black River Falls which was lab-coated with four different clay suspensions (kaolin, illite, sodium montmorillonite and calcium montmorillonite). A total of ten batches: a control, two containing natural coatings and 4 containing each one of the select clays as coarse aggregate coatings at a 0.45 w/c ratio were prepared along with 3 additional batches with extra water to maintain workability. The major findings are that the effects of microfines in concrete are not only dependent on the amount of microfines but also on their nature. The methylene blue test together with P200 to calculate the modified methylene blue value is the best predictor of the influence of coatings on concrete performance, but the methylene blue test presents practical difficulties for WisDOT implementation and a new test is needed.
    Subject
    Coatings
    Montmorillonite
    Wisconsin
    Aggregates
    Performance
    Igneous rocks
    Concrete pavements
    Films (Coatings)
    Illites
    Kaolin
    Coarse aggregates
    Sodium compounds
    Calcium compounds
    Clay minerals
    Permanent Link
    http://digital.library.wisc.edu/1793/53314
    Type
    Technical Report
    Description
    83 p.
    Part of
    • Wisconsin Highway Research Program

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