A method for repairing a composite containment casing comprising: providing a composite containment casing having an integrated, cured, resin-infused abradable system, wherein the abradable system comprises: a sandwich structure; and at least one abradable layer applied over the sandwich structure, the at least one abradable layer forming a radially innermost layer of the abradable system; wherein the abradable system has at least one damaged portion; the method of repair comprising: removing the damaged portion of the abradable system to leave a hole in the abradable system of the containment casing; shaping a sandwich structure segment to produce a shaped sandwich structure; placing the shaped sandwich structure into the hole in the abradable system and infusing a resin into the shaped sandwich structrure; and curing the containment casing having the shaped sandwich structure to thereby bond the shaped sandwich structure in the hole to the containment casing; and applying at least one abradable layer to the shaped sandwich structure to produce the containment casing having a repaired integrated abradable system. providing a composite containment casing having an integrated, cured, resin-infused abradable system, wherein the abradable system comprises: a sandwich structure; and at least one abradable layer applied over the sandwich structure, the at least one abradable layer forming a radially innermost layer of the abradable system; wherein the abradable system has at least one damaged portion; the method of repair comprising: removing the damaged portion of the abradable system to leave a hole in the abradable system of the containment casing; shaping a sandwich structure segment to produce a shaped sandwich structure; placing the shaped sandwich structure into the hole in the abradable system and infusing a resin into the shaped sandwich structrure; and curing the containment casing having the shaped sandwich structure to thereby bond the shaped sandwich structure in the hole to the containment casing; and applying at least one abradable layer to the shaped sandwich structure to produce the containment casing having a repaired integrated abradable system. a sandwich structure; and at least one abradable layer applied over the sandwich structure, the at least one abradable layer forming a radially innermost layer of the abradable system; wherein the abradable system has at least one damaged portion; the method of repair comprising: removing the damaged portion of the abradable system to leave a hole in the abradable system of the containment casing; shaping a sandwich structure segment to produce a shaped sandwich structure; placing the shaped sandwich structure into the hole in the abradable system and infusing a resin into the shaped sandwich structrure; and curing the containment casing having the shaped sandwich structure to thereby bond the shaped sandwich structure in the hole to the containment casing; and applying at least one abradable layer to the shaped sandwich structure to produce the containment casing having a repaired integrated abradable system. removing the damaged portion of the abradable system to leave a hole in the abradable system of the containment casing; shaping a sandwich structure segment to produce a shaped sandwich structure; placing the shaped sandwich structure into the hole in the abradable system and infusing a resin into the shaped sandwich structrure; and curing the containment casing having the shaped sandwich structure to thereby bond the shaped sandwich structure in the hole to the containment casing; and applying at least one abradable layer to the shaped sandwich structure to produce the containment casing having a repaired integrated abradable system.