INVESTIGATION OF NONMETALLIC WATERSTOPS. REPORT 9: FINAL REPORT OF EFFECT OF EXPOSURE
Sample of rubber, synthetic rubber, and polyvinyl chloride (PVC) waterstops, both stressed and unstressed, were exposed at Treat Island, Maine, to freezing and thawing in a cold marine environment; at St. Augustine, Florida, to wetting and drying in a warm marine environment; near St. Louis, Missouri, in cold fresh water and in cold contaminated water; and at Jackson, Mississippi, outdoors to a moderate climate, indoors in air without sunlight, and in a weak solution of sodium and magnesium sulfate. The samples were exposed during 1957-1959. In March of 1966, two of the three exposed coupons of each material at each condition of stress, where available, were returned to the laboratory for evaluation. Some of the samples were lost during exposure. The results of the field exposure and laboratory evaluation prior to 1966 were reported as Report 6 of the Technical Report No. 6-546 series. In 1973, the remaining coupon from each exposure station, where one existed, was returned to the laboratory and evaluated. This report is to a large extent an updating of Report 6. Of the rubber and synthetic rubber samples exposed, all were affected by exposure under most of the nine exposure conditions, with the more pronounced effect being on the specimens exposed in hot sunlight (Jackson outdoors and St. Augustine) and in contaminated water (St. Louis and New Orleans). It appeared that, generally, neoprene best withstood most exposure conditions, with natural, butyl, and service rubber following, in that order. As with rubber, PVC was more affected by hot sunlight and air than by the other exposure conditions. A number of samples apparently lost plasticizer and became hard and brittle, especially at New Orleans in contaminated water. Both rubber and PVC samples were more affected by exposure when stressed than when unstrssed and were less affected when embedded in concrete than when not embedded. Results indicate that PVC, neoprene, and natural rubber are all satisfactory materials for the production of nonmetallic waterstops. A good grade PVC would probably have the longer service life under most conditions. There is, however, more danger of getting a poor grade material unless laboratory testing for compliance with rigid specifications is required. /USAEWES/
U.S. Army Waterways Experiment Station3909 Halls Ferry Road
Vicksburg, MS USA 39180-6199
- Houston, B J
- Publication Date: 1975-6
- Pagination: 34 p.
- TRT Terms: Crash exposure; Durability; Freeze thaw tests; Fresh water; Laboratory tests; Materials tests; Neoprene; Polyvinyl chloride; Rubber; Seas; Stresses; Sunlight; Synthetic rubber
- Uncontrolled Terms: Exposure
- Old TRIS Terms: Marine atmospheres; Stress conditions; Water stops
- Subject Areas: Geotechnology; Highways; Materials; Safety and Human Factors;
- Accession Number: 00098290
- Record Type: Publication
- Report/Paper Numbers: TR-6-546 Final Rpt.
- Files: TRIS
- Created Date: Jul 29 1975 12:00AM