The grout-like material called flowable fill has experienced new popularity, particularly the controlled low-strength material variety, which is easily excavated. The properties ordinarily desired of the mix are: (a) flow under gravity; (b) hardening for early walkability and cover; and (c) ultimate strength low enough to allow ready excavation. Flowability of fresh material is evaluated in a simple spread test. Hardening is measured by a mortar penetrometer, and these values are correlated with unconfined compressive strength. It is desirable to keep the ultimate strength to less than 1 035 kPa (150 lbf/in.2); somewhat less target strength is selected for the 28-day value. Mix design is empirical, but the time and expense required may be reduced by following a rational and logical procedure, which is described. The materials emphasized in this paper are Class F coal combustion fly ash and waste sands from greensand ferrous castings.


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    Title :

    Mix Design for Flowable Fill


    Additional title:

    Transportation Research Record


    Contributors:
    Bhat, S. T. (author) / Lovell, C. W. (author)


    Publication date :

    1997-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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