Investigation of Nonmetallic Waterstops. Report 7. Preparation of Laboratory Test Samples from Finished Waterstops

摘要

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 type of equipment to be used in molding, slicing, and grinding the waterstop is described in the report. (Author)