Problem: Low Adhesive Strength To Concrete
Solution: Direct-To-Aggregte Bonding Method
Top: Smooth Concrete
Bottom: Exposed Aggregate
HISTORY: Adhesion to deteriorated concrete surfaces is a surface preparation problem. Typical preparation applies a smooth with a fresh layer of rapid setting concrete and then overcoat with epoxy. This method has proven unreliable.
WHY IS IT UNRELIABLE? After a new concrete surface is cured it must be cleaned to remove laitence. Laitence is easily removed, but if not removed cannot reliably hold a coating. Cement also has poor tensile strength compared to epoxy.
NEW LINING METHOD: Direct-To-Aggregate method eliminates the need for cement underlayment by bonding directly to the original, well cured concrete structure. By this method, no laitence is present to interfere with the bond. Flooding the surface with epoxy creates a massive bond to aggregate, the most corrosion resistant component of concrete, and which is deeply buried in the host structure.
Test Results: These photos demonstrate the effect of back-side forces on cement and PureEpoxy. Cement easily fractures and disbonds from the surfaces (top right), whereas the PureEpoxy has massively improved bond . In the Direct-To-Aggregate (lower left) the entire concrete surface pulled apart without damaging the PureEpoxy. The cement (lower right) fractures and fails at a much lower force.