. Design for implosion of concrete cylinder structures under hydrostatic loading. Underwater concrete construction; Hydraulic structures. Figure B-1. Cylinder specimen being removed from mold. Figure B-2. Specimen partly assembled inside polyethy- lene tent. The specimens were moist-cured in this manner untU assembled for test. During assembly (Figure B-2) a tent of polyethylene film was used to maintain a high relative humidity environment around the speci- men to minimize shrinkage cracking. Keeping the cylinder in the moist environment assured the test conductors that the concrete was in a
. Design for implosion of concrete cylinder structures under hydrostatic loading. Underwater concrete construction; Hydraulic structures. Figure B-1. Cylinder specimen being removed from mold. Figure B-2. Specimen partly assembled inside polyethy- lene tent. The specimens were moist-cured in this manner untU assembled for test. During assembly (Figure B-2) a tent of polyethylene film was used to maintain a high relative humidity environment around the speci- men to minimize shrinkage cracking. Keeping the cylinder in the moist environment assured the test conductors that the concrete was in a "wet" condition at the time of the implosion test. Assembly The procedure to assemble a specimen for test (Figure B-3) began by placing the cylinder on the bottom end-closure, which was a flat steel plate. The top end-closure was a steel ring. The top and bottom closures were held together by eight chains, post-tensioned to precom- press the concrete by 20 psi ( MPa) when the structure was sub- merged in water in the pressure vessel. 41. 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 Haynes, H. H; Naval Construction Battalion Center (Port Hueneme, Calif. ). Civil Engineering Laboratory. Port Hueneme, Calif. : Naval Construction Battalion Center
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