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Title: Investigation of nonmetallic waterstops : report 2 : evaluation of the effect-of-alkalies and accelerated extraction tests
Authors: U.S. Army Engineer Waterways Experiment Station
Keywords: Sealing compounds
Joints (Engineering)
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; 6-546 rept.2.
Description: Technical Report
Summary: Nineteen nonmetallic waterstop materials, consisting of 10 standard or cold-weather polyvinylchlorides, two polyethylenes, and seven natural or synthetic rubbers, were subjected to the accelerated extraction and effect-of-alkalies tests described in Corps of Engineers Specifications for Polyvinylchloride Waterstops (CRD-C 572-60A). The results were analyzed and it was found that: (A.) The accelerated extraction test did not affect the tensile strength of the standard-grade polyvinylchloride, but did affect the tensile strength of all the other materials tested. (B.) The accelerated extraction test affected the ultimate elongation of all the materials tested. (C.) The changes in weight and hardness in the effect-of-alkalies test were linear for the two times of observation used. The change in thickness was due to experimental error only. (D.) All the materials tested met the change-in-hardness requirement of the effect-of-alkalies test. (E.) Most, if not all, of the rubbers failed to meet the accelerated extraction test requirements and also the change-in-weight requirement of the effect-of-alkalies test. The Corps of Engineers specification limits were examined in the light of the test results, and it is recommended that: (1.) The change-in-thickness portion of the effect-of-alkalies test be deleted as one of the requirements of CRD-C 572-60A. (2.) The change-in-weight portion of the effect-of-alkalies test be limited to one observation at seven days and that three replications be made. (3.) The specification limits for both tensile strength and ultimate elongation be rewritten to clarify these limits.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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