There are two basic methods for bonding a portland cement based product to existing concrete.
Bond cement to concrete.
1 chemically and 2 mechanically.
Make sure all of the old concrete has a layer of slurry on top of it before you move on.
48 1 kb today it is possible to bond any material including concrete itself firmly and permanently to a hardened concrete surface.
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Such bonding using epoxy based glues becomes as strong and frequently stronger than can be achieved by any mechanical means of connection.
The sand should pass the no.
The cement present in a concrete mix does not have any bonding agent within it.
When a layer of fresh concrete is added over an existing or old concrete layer they exist as two separate layers without any bond.
So a bonding agent must be introduced between the layers.
Let s discuss the mechanical approach first since it is really used in both approaches.
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Brush a thin layer of the slurry mixture onto the old concrete.
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Brush the slurry over the damp concrete to form an even layer.
The bonding sand cement grouts usually consist of 1 part cement 1 part sand and enough water about 1 2 part to form a creamy consistency.
Aci 503 details the use and specification of epoxies for bonding fresh to hardened concrete.
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