Tensile Bond Strength Between Grout and Concrete

[Ussuri]

We are currently looking at doing some trials to test the bond strength in tension between 50MPa concrete with a wood float finish and a high flow non shrink cementitious grout.

The test involves pouring the grout into a test assembly made of steel. We then have a series of hydraulic cylinders around the perimeter which are manifolded together so the stroke out at the same rate. The idea is to force the concrete and grout apart.

I am trying to design the cylinder attachments. The problem is, we have no idea how much force the cylinders will need to exert. We dont want the attachments failing before the bond.

So I am trying to get a handle on how strong the bond might be to allow me to make a stab at the forces involved.

Does anyone have any suggestions? The tensile strength of the grout may be 1-5 MPa, but what about the bond? Ideas anyone?

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[civilperson]

A good first approximation would be fifty pounds per square inch, (order of magnitude estimation from research using smooth dowels cast in concrete).