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Title: PREFORMED MEMBRANE PERFORMANCE UNDER CONTROL CONDITIONS
Accession Number: 00627141
Record Type: Component
Availability: Find a library where document is available Abstract: Recently, preformed membrane systems have been used extensively in the United States and Europe as a preventive technique to reduce the corrosion in reinforced steel in bridge deck structures. However, the membrane integrity and effectiveness have not been addressed sufficiently. Therefore, an extensive laboratory investigation was conducted to evaluate the membrane effectiveness as a chloride barrier. A total of 48 typical bridge deck slabs were cast in the laboratory: 36 of them were 5 x 5 ft and 12 of them were 5 x 4 ft. A total of four slabs were control, another 4 were overlaid with hot-mix asphalt, and the rest (40 slabs) were covered with three types of preformed membranes and overlaid with hot-mix asphalt. The membranes were installed with various perforation sizes and frequencies. The slabs were exposed to 9 months of deicing (2.3% salt) application simulating the average of two winters of salt application in the New England states. Also, twelve 1- x 1-ft specimens were cast for preliminary evaluation. Ultrasonic pulse velocity was used as a nondestructive testing technique to evaluate the installed membranes. Ground truth cores were obtained and powdered concrete samples at three different depths were taken to measure the chloride contents. A statistical model was developed to predict the membrane status using the transit time measured by ultrasonic-pulse velocity. Chloride contents of the unprotected slabs were found to be relatively high compared with those of the protected ones. The performation-per-unit area in the membrane system was correlated with the chloride content, and a hole size of 1/4 in. was found to be a critical size.
Supplemental Notes: This paper appears in Transportation Research Record No. 1371, Bridge, Culvert, and Tunnel Research. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
Monograph Title: Monograph Accession #: 01405120
Language: English
Authors: Al-Qadi, Imad LWeyers, Richard EGalagedera, N LalithPagination: p. 53-61
Publication Date: 1992
Serial: ISBN: 0309054141
Features: Figures
(3)
; References
(19)
; Tables
(7)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Bridges and other structures; Design; Highways; Vehicles and Equipment; I24: Design of Bridges and Retaining Walls
Files: TRIS, TRB, ATRI
Created Date: Mar 24 1993 12:00AM
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