Repair of Concrete Surfaces Subjected to Abrasion Erosion Damage.

摘要

A survey of Corps Divisions and District offices identified 54 structures that have experienced concrete damage due to erosion. Depths of erosion ranged from a few inches to approximately 10 ft. In general, this erosion damage resulted from the abrasive effects of waterborne rocks and other debris being circulated over the concrete surface during construction and operation of the structure. A variety of materials including armored concrete, conventional concrete, epoxy resins, fiber-reinforced concrete, and polymer-impregnated concrete have been used in the repairs reported herein with varying degrees of success, the degree of success generally being inversely proportional to the degree of exposure to those conditions conducive to erosion damage. These materials have been used with various construction procedures including dewatering and underwater repairs. It appears that given appropriate flow conditions in the presence of debris, all of the materials described are susceptible to some degree of erosion. No one material has demonstrated a consistently superior performance advantage over alternate materials. While improvements in materials should reduce the rate of concrete damage due to erosion, this alone will not solve the problem. Until the adverse hydraulic conditions which caused the original damage are minimized or eliminated, it will be extremely difficult for any of the materials currently being used in repair to perform in the desired manner. (Author)