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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />to the American Concrete Institute (ACi) "Building Code Requirements for Reinforced <br />Concrete" (ACI 318-77 or latest revision). <br /> <br />Recommended concrete repairs follow the "Standard Specifications for Repair of <br />Concrete" (M-47) as prepared by the Bureau of Reclamation, U. S. Department of the <br />Interior and can generally be placed in one of the following three categories: <br />I. Repair depths greater than 6 inches and covering appreciable areas; <br />2. Repair depths between 11'2 inches and 6 inches; <br />3. Repair depths less than 11'2 inches or covering small areas. <br /> <br />For repair depths greater than 6 inches and covering appreciable areas, the <br />recommended repairs consist of removing any bad (spoiling, loose, or otherwise <br />deteriorating) concrete, thoroughly cleaning the surface, and placing standard concrete <br />to the original or desired dimensions. No bonding agents are required for this type of <br />repair. <br /> <br />For depths between 11'2 inches and 6 inches, the recommended procedure is the same <br />as above, except that the surfaces being repaired should be treated with an epoxy-resin <br />bonding agent immediately prior to placement of the concrete. <br /> <br />For repair depths less than 11'2 inches, the surface should be cleaned and coated with <br />an epoxy-bond coat and repairs made with an epoxy mortar. <br /> <br />Painting. In order to assure a maximum possible useful life, all steel and timber <br />gates, as well as any other exposed metalwork, should be thoroughly cleaned and <br />painted. The following preliminary recommendations are made concerning typical <br />painting systems. <br /> <br />All steel surfaces should be cleaned of loose rust and dirt, sandblasted with a <br />minimum SSPL-SP6 Commercial Blast, I and primed with an Epoxy-Polyamide coating. <br />The top coat on the steel gates should be an Epoxy-Polyamide, and the top coat on the <br />exposed metalwork (handrails, etc.) should be an Aliphatic Polyurethane Enamel. The <br />timber gates should receive an Epoxy-Polyamide top coat. <br /> <br />Handrails and Grating. A number of structures on the canals were observed to have <br />potential safety hazards which could be reduced by installing and repairing handrails and <br />safety grating. <br /> <br />I As defined by the Steel Structures Pointing Council (SSPC). <br /> <br />16 <br />