INVESTIGATION OF NON-METALLIC WATERSTOPS. REPORT 7: PREPARATION OF LABORATORY TEST SAMPLES FROM FINISHED WATERSTOPS

CORPS OF ENGINEERS SPECIFICATIONS FOR RUBBER AND POLYVINYLCHLORIDE (PVC) WATERSTOPS REQUIRE THAT THE MANUFACTURER FURNISH SHEET MATERIAL FROM THE SAME LOT AS THE FINISHED WATERSTOP FOR ACCEPTANCE TESTING. SINCE THE SHEET SAMPLES HAVE BEEN FOUND IN SOME CASES TO HAVE PROPERTIES DIFFERENT FROM THE FINISHED WATERSTOP, A STUDY WAS MADE TO DETERMINE THE FEASIBILITY OF PREPARING ALL TEST SAMPLES IN THE LABORATORY FROM THE FINISHED WATERSTOP. TWO NATURAL RUBBER AND TWO PVC SPECIMENS WERE TESTED. A MOLDING STUDY WAS ALSO CONDUCTED TO DETERMINE THE OPTIMUM TEMPERATURE-TIME-PRESSURE COMBINATION FOR PREPARING TEST SAMPLES. TEST RESULTS CONFIRMED THAT SHEET SAMPLES SUBMITTED BY THE MANUFACTURER WERE NOT ALWAYS REPRESENTATIVE OF THE FINISHED WATERSTOP AND INDICATED THAT LABORATORY-PREPARED SPECIMENS WERE MORE REPRESENTATIVE. THE PVC SPECIMENS SHOULD BE PREPARED BY MOLDING THE FINISHED WATERSTOP AT 310 F FOR 5 MIN UNDER A PRESSURE OF 1100 PSI. IT WAS FOUND THAT RUBBER SPECIMENS COULD NOT BE MOLDED WITHOUT CHANGING THE PROPERTIES OF THE RUBBER. INSTEAD, RUBBER SPECIMENS SHOULD BE PREPARED BY SLICING AND GRINDING THE FINISHED WATERSTOP. THE TYPE OF EQUIPMENT TO BE USED IN MOLDING, SLICING, AND GRINDING THE WATERSTOP IS DESCRIBED. /AUTHOR/

• Supplemental Notes:
  • Tech Rept NO 6-546, 15 PP, 6 FIG, 7 TAB
• Authors:
  • Houston, B J
• Publication Date: 1970-8

Media Info

• Serial:
  • Waterways Exp Sta Tech Repts, Army Ce

Subject/Index Terms

• TRT Terms: Acceptance tests; Chemical compounds; Forming; Grinding; Laboratory tests; Nonmetals; Polyvinyl chloride; Pressure; Rubber; Sheathing; Temperature; Time
• Old TRIS Terms: Nonmetallic compounds; Slicing; Water stops
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00217155
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 10 1971 12:00AM