Patent ID: 8578670

Claim:
A construction structure comprising: (a) a substrate made of a concrete material and providing an external surface; and (b) a reinforcement attachment made of a metallic material and defining an outwardly facing surface and an inwardly facing surface; and wherein said attachment is secured to said substrate with the inwardly facing surface bonded to the external surface of said substrate, said attachment having at least a first portion and a second portion, one or both of the surfaces of the attachment are pre-treated such that yield strength of the first portion(s) is higher than yield strength of the second portion(s) whereby when said construction structure is under loading the first portion(s) block(s) yielding or reduce(s) spreading of longitudinal strain sustained by said attachment along said attachment and yielding of the attachment is localized to the second portion(s) for avoiding or minimizing debonding of said reinforcement attachment from said substrate; wherein the surfaces of said attachment are divided into a first zone and a second zone corresponding to the first portion(s) and the second portion(s) of said attachment, the first zone is pre-treated with surface nanocrystalization by using surface mechanical attrition treatment, and the second zone is either not pre-treated with nanocrystalization or pre-treated with less surface nanocrystallization using surface mechanical attrition treatment when compared with the first zone, whereby when said attachment is subject to longitudinal stress larger yield strain is confined between two adjacent first portions of said attachment for avoiding or minimizing debonding of said reinforcement attachment from said substrate.