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Poor concrete ontop of monoliths

  • 28-09-2007 8:23am
    #1
    togster
    Closed Accounts Posts: 2,931 ✭✭✭


    Does anyone know what might cause spots of poor dis-coloured concrete on the top surface of monoliths.

    Heres the recipe

    Cement
    Silica
    Water
    Glenium
    Micro-air


    The same mix was used for all 18 monoliths but 15-17 displayed poor spots.

    Any suggestions welcome


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