Concrete Bonding Agent
Concrete Bonding Agent
(OP)
We are investigating the bond of a thin high strength concrete screed 2" to existing concrete floor using an SBR. Prep includes saturating the floor and grit balsting to expose aggregate.
using pull off testing, can anyone tell me what bond strengths should be achieved?
Also, at what strength would concrete (original slab) failure be expected? The original slab is 35N, 10 years old and in relatively good condition.
Thanks
MH
using pull off testing, can anyone tell me what bond strengths should be achieved?
Also, at what strength would concrete (original slab) failure be expected? The original slab is 35N, 10 years old and in relatively good condition.
Thanks
MH





RE: Concrete Bonding Agent
RE: Concrete Bonding Agent
RE: Concrete Bonding Agent
RE: Concrete Bonding Agent
what i have been told is that for an epoxy agent the concrete will fail first but not necessarily so for an sbr.
we are doing QA pull off tests and only achieving 150 psi. i'm looking for vales of pull off where we should expect the original slab to break.
any ideas? is it just the tensile strength of the slab? if so that is approx 3-4 times stronger than the SBR bond.
Confused!
RE: Concrete Bonding Agent
Yes, it is just a simple tensile failure consideration. 150 psi is no bad, but it likely won't withstand the stress if you are have the need for a high strength topping.
You might consider a full polymer modified topping such as SikaTop or similar.