Investigation of Nonmetallic Waterstops. Water Retentivity and Tensile Strength of Splices. Report 4.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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This report on the investigation of nonmetallic waterstops presents results of water-retaining tests of various shapes of waterstops, evaluation of various types of splices, and correspondence concerning the availability of plastic waterstops made from materials other than PVC. It also describes the development of a method for testing an entire splice for tensile strength. Corrugated or ribbed-flange waterstops and dumbbell waterstops are both effective in retaining water when care is exercised in splicing and embedding them, with the former type being slightly more effective. It is necessary to re-form the continuity of the ribs across the splice of the ribbed-flange waterstop for best results in retaining water. The tensile strength of a fused splice, used in splicing PVC waterstops, will average nearer the strength of the unspliced material than will that of a vulcanized splice of either natural or synthetic rubber. The glued sleeve splices tested were stronger than the vulcanized splices of the same waterstop, whereas the glued lapped splices tested were not as strong as the vulcanized splices. Apparently PVC is the best currently available material for the production of plastic waterstops from the standpoints of both quality and economy however, waterstops extruded from ethylene copolymer have recently been introduced and recommended for use where movement of less than 20 of the original joint opening is expected. Author, modified-PL
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