Technical Manual: Conduits through Embankment Dams (FEMA 484)

Chapter 14—Repair and Abandonment of ConduitsFigure 192.—Injection of urethane grout to stop leakage.repairs could result in continued deterioration and/or failure. A successful concreterepair depends on quality of workmanship, procedures followed, and materials used.A systematic approach to repair should be followed. Sources, such as the Bureau ofReclamation, U.S. Army Corps of Engineers, American Concrete Institute, PortlandCement Association, the International Concrete Repair Institute, and private authorshave developed good systems and methodologies. A summary of Reclamation’sconcrete repair system is presented here as an example (see Reclamation’s Guide toConcrete Repair [1997] for a detailed discussion on concrete repair):• Determine the cause(s) of damage.—The cause ofdamage or deterioration (e.g., abrasion,cavitation, poor design and construction, etc.)to the original concrete must be assessed(figure 193), or else the repair of concrete mayalso become subject to the same damage ordeterioration. A determination must be madeas to whether the damage is the result of aone-time or a recurring event. The damagecould also be the result of multiple causes,such as improper design, low quality materials,or poor construction technique.• Evaluate the extent of the damage.—The extentand severity of the damage and the effects onthe serviceability of the existing conduit mustFigure 193.—Determine the causeof the damage to determine theproper repair method.349