Experimental Study on Interfacial Bond behavior between Concrete to Concrete by using Different Epoxy

Abstract

Concrete is the most extensively used construction material globally, so its demand grows. But the concrete
life span is decreased due to overloading or hazardous environmental condition. So, the restoration of concrete is
required after some duration. However, the new construction every time is uneconomical. This type of problem can
be avoided by repairing/strengthening the structural members made of concrete. Repair materials help in
extending the life and durability of concrete structures, reducing costs, and improving safety. However, the
interference layer i.e., the weakest part between substrate concrete and overlay concrete bahaviour needs to be
understood clearly. Various materials are often used in construction to repair large cracks, defective components,
and holes in damaged concrete surfaces with the bonding agent. However, bonding agents are not beneficial
because the bond coat creates an extra plane, which reduces the effective interlocking of new and old concrete and
leads to cohesiveness failure due to micro-cracks.
The cohesiveness failure can be reduced by suitable surface treatment. Several methods for measuring the bond
strength between substrate concrete and overlay concrete are available we used bonding admixtures are Lapox
Hardener, Lapox Lacrete, Cera Bond EP. Being simple, the Cylindrical SST is used with a 45º angle. In this study,
various types of surface treatment like Lapox Resin, Lapox Hardener, and Cera Bond EP are considered because
the repair fails due to poor surface preparation more frequently than any other reason. In this regard,
experimental investigation has been carried out and concludes that Lapox Hardener shows better bonding
behavior as compared to.