The conventional injection method for waterproofing the cracks emerging underneath a concrete structure is problematic. Therefore, the authors developed a hybrid type waterproofing using two substances consisting of polyurethane resin and aqueous emulsion. This method reliably stops water leakage by thorough curing. This method performed excellently in testing, demonstrating rapid curability, stability of configuration, the elongation property. It also facilitates the injection of chemicals into fine cracks. In application to a structure, this method was demonstrated excellent durability and performance.
