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    Albert Pietersm's Avatar
    Albert Pietersm Posts: 1, Reputation: 1
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    #1

    Jul 31, 2012, 09:34 AM
    Join new concrete to old concrete
    To join new concrete to old concrete, will it work to use a paste of pure Portland as a join?
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
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    #2

    Jul 31, 2012, 07:47 PM
    Concrete what? Slab? Wall? Sidewalk? How thick?

    Sidewalk can use an expansion joist.

    On slab can be pinned together with rebar.

    Chuck
    smearcase's Avatar
    smearcase Posts: 2,392, Reputation: 316
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    #3

    Aug 1, 2012, 04:23 AM
    No. Portland cement paste cannot be used to bond old concrete to new concrete. There are bonding agents available for that purpose, under the right conditions. Cement paste has one basic purpose where it excels, and that is it's capacity to bond the individual components of a concrete mix together.
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