How do the polymers compare with the epoxy and polyurethane system?
Epoxies and polyurethane are sufficiently strong and expensive products. Their mortars and coatings generally tend to be more rigid hence has a tendency to crack during movement/deflection, which the beams and roof slabs constantly face. Non-uniformity of coefficient of thermal expansion of concrete and these products also creates the possibility of creep or lateral movement at the repair interface. Moreover general grades of epoxy and polyurethane are not compatible with cement concrete system hence rarely used in structural rehabilitation works.
