POLYMERIC CONCRETE COMPOSITION, PROCESSES FOR TUBE COATING AND FOR FILLING CONCRETE SEAM CUTTINGS USING COMPOSITION AND A REUSABLE TEMPLATE FOR FILLING CONCRETE SEAM CUTS

摘要

This invention relates to a polymer concrete composition; to methods for lining pipes and for filling girthweld concrete cutbacks using the composition, and to a reusable mold for preparing filled girthweld concrete cutbacks. The polymer concrete composition contains no transition metal compounds and comprises a vinyl ester resin or an unsaturated polyester resin, a free radical initiator; a transition metal free, an accelerator which does not contain a transition metal. The reusable mold comprises a separable sheath (10) having a means (21) for introducing a filler composition to the girthweld concrete cutback (40). The sheath is capable of conforming generally to the shape of the coated pipe (1, 2) or other coated conduit and circumscribing the entire circumference or perimeter of at least a portion of the pipe or other conduit. The mold further comprises a closure means (20) mounted on the separable sheath. The combination of closure means and the separable sheath operate in a manner such that, in one position, the pipe is free to move through the mold and, in a second position, the combination of the closure means and the sheath are such that the filler composition can be introduced to fill the cavity defined by the sheath and the concrete cutback of the two pipe sections being joined.