. Construction materials for coastal structures. Coastal engineering; Building materials. (5) inject the epoxy resin adhesive under pressure through the first nipple (lowest in the case of a vertical or diagonal crack] until the level of adhesive reaches the next nipple (see Fig. 20];. Figure 20. Concrete structure showing nipples through which epoxy resin is injected. (6) using an inert gas, maintain a pressure of 620 kilopascals (90 pounds per square inch] for about 1 minute to force the adhesive into any interior microcracks adjoining the crack under repair; (7) release the pressure and the
. Construction materials for coastal structures. Coastal engineering; Building materials. (5) inject the epoxy resin adhesive under pressure through the first nipple (lowest in the case of a vertical or diagonal crack] until the level of adhesive reaches the next nipple (see Fig. 20];. Figure 20. Concrete structure showing nipples through which epoxy resin is injected. (6) using an inert gas, maintain a pressure of 620 kilopascals (90 pounds per square inch] for about 1 minute to force the adhesive into any interior microcracks adjoining the crack under repair; (7) release the pressure and then pump more adhesive through the same nipple until the next nipple overflows, then disconnect the hose and cap the nipple; (8) follow the procedure until the entire crack is filled and all nipples are capped; and (9] cut off the protruding ends of the capped nipples flush with the concrete surface, plugging the resultant exposed openings with epoxy resin sealant. g. Repair of Joints. Much experience of poor sealant performance and resulting damage to a wide variety of structures exists. Concern with such problems spurred the development and introduction in the last decade of higher class sealants, both field-molded and preformed. Failures have continued to occur, however, often within days and weeks rather than months or years, for five, main reasons: (1) The joint as designed was of an impossible width, shape or potential movement to seal successfully, yet an attempt was made to seal it; 136. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Moffatt & Nichol, Engineers; Coastal Engineering Research Center (U. S. ). Fort Belvoir, Va. : The Center
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