Concrete Protector & Restorer Testimony

"It [CP&R] goes into the concrete. It gets into the tiniest spaces. Many products claim to do this and don't. I know for a fact that 3M CP&R product does."

"What I like best about CP&R product is it really does penetrate the concrete. It gets into the tiniest spaces, fills the tiniest pores and binds them and heals them. In over 20 years of expereince I've never seen a product work so well."

Dick Stehly, P.E. Principal, American Engineering Testing

Field Experience Using CP&R

A floor topping had delaminated from the base concrete slab. So it was necessary to restore the bond.

Previous to using CP&R, a bonding agent had been used but failed.

When CP&R was applied to this area, it was able to get into the very, very finest pores and cracks within the concrete and mend it. There was evidence of CP&R penetrating as small a crack as a thousandth of an inch (1 mil). (See photo on right.)

Laboratory Testing

The following is a comparison between high modulus products and 3M's low modulus CP&R product. 3M CP&R products were evaluated by American Engineering Testing against a battery of other products in several different tests. The slant shear test revealed some striking advantages to 3M low modulus product compared to other high modulus products, such as HMWM, epoxy or urethane repair materials, which are typically high modulus

High Modulus Products

The slant shear test is used to show the bond capability of a repair material. The test specimen you see has been repaired with a high modulus material. The horizontal line has been added to help detect movement. The high modulus repair fails suddenly, without warning. High modulus repairs are strong, but inflexible. High modulus materials cannot accommodate much movement. This can lead to future cracking.

3M CP&R Low Modulus

This test specimen has been repaired with 3M's low modulus CP&R product. The horizontal line has been added for reference. The repair material stretches during the test. The total movement of this repair was about three-fourths of an inch. While the ultimate load was about 60% of the high modulus repair, the movement was over 10 times greater. Where movement is expected, the low modulus product is preferred. Movement must be accomodated in most non-structural repairs. Accomodating movement can help reduce future cracking.