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原文传递 Development of a Standard Accelerated Corrosion Test for Acceptance of Post-Tensioning Grouts in Florida.

题名：	Development of a Standard Accelerated Corrosion Test for Acceptance of Post-Tensioning Grouts in Florida.
作者：	pacheco, a. r. schokker, a. j. hamilton, h. r.
关键词：	post-tensioning tendons, bleed
摘要：	Recent corrosion grouting problems found in Florida's post-tensioned bridges has shown how important quality grouting materials and proper grouting techniques can be to the longevity of bridges. This problem is not concentrated in Florida, but has captured national and even international attention due to problems encountered in Florida and abroad. Portland cement grout is commonly used to fill the voids in post-tensioning ducts after the tendon is stressed. Portland cement grout provides a protective barrier, high alkaline environment, and bonds the tendon to the duct to allow higher tendon stresses to be developed. The Post-Tensioning Institute has recently published a guide specification for grouting of post-tensioning tendons that calls for the use of an accelerated corrosion test (ACT). Florida is considering including the ACT as part of its grouting specification. The ACT, however, has not been fully evaluated and warrants further investigation. Another potential issue with the PTI specification is bleed. Therefore, in addition to evaluating the ACT, researchers will also conduct bleed tests: specifically, they will develop a better correlation between the Schupack pressure bleed test and the actual bleed that occurs on sloped tendons of varying lengths. / NOTE: Final rept. / Supplementary Notes: Sponsored by Florida State Dept. of Transportation, Tallahassee. Research Management Center. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0715；108p
报告类型：	科技报告