To get this stucco to bond permanently to the spalled concrete the old concrete must be.
Does cement bond to concrete.
After the concrete is cured using just the cement and sand mixture won t keep things like iron aluminum or wood on the surface.
Well you may have thought why not we use cement mixture to adhere to different elements to the concrete surface.
Contact cement is not sticky.
The cement within a concrete mix doesn t contain any natural bonding agents so when fresh concrete is added on top of an existing layer of concrete the two won t join together.
In many cases freshly poured concrete will not bind to the other material but be separate.
When it does you either have to patch it or replace it.
These glues or bonding agents are made up of two liquids a base resin and a curing agent or hardener which are mixed immediately prior to use.
Aci 503 details the use and specification of epoxies for bonding fresh to hardened concrete.
Concrete would have gotten an f.
Cement which is part of the concrete mix does not have any natural bonding agents.
Use portland or mortar cement mix for the most effective bonding slurry.
For example if you ve mixed together 1 2 gallon 1 9 l of water and glue you ll need to add 1 gallon 3 8 l of cement mix.
This will not produce a strong serviceable floor.
The sand should pass the no.
Assuming that it is structurally sound the least expensive alternative is to patch it.
For surfaces that are weight bearing such as floors and foundations this issue means lack of a sound structure.
There are certain reasons but primarily the composition of the concrete and the porous nature of the stone create an almost impossible environment to bond stone to concrete.
Contact cement is different from other adhesives because it needs to air dry for 15 to 20 minutes before assembling.
Today it is possible to bond any material including concrete itself firmly and permanently to a hardened concrete surface.
You just mix up some sand a little hydrated lime and portland cement and trowel this onto the concrete.
If you add too much concrete add more water and glue to loosen the paste and make it softer.
There is nothing in basic portland cement that will act as a bonding agent.
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.
Once cured the new concrete will simply sit on top as a separate layer.
Even the ones that are available are barely fit for the job.
Yes you can do that but only when you are making the concrete block.
Such bonding using epoxy based glues becomes as strong and frequently stronger than can be achieved by any mechanical means of connection.
The products available on the market for stone and concrete bonding are sparse.
Concrete is marvelous stuff but in time it will deteriorate.
