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51313-02602-Laboratory Corrosion Assessment of Post-Tensioned Tendons Repaired with Dissimilar Grout

Product Number: 51313-02602-SG
ISBN: 02602 2013 CP
Author: Kingsley Lau
Publication Date: 2013
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Grout in failed post-tensioned tendons in Florida with varying extent of segregation was characterized as having different properties and chemistry which may promote corrosion activity. Although early repair procedures have been implemented in a bridge to remove the most severely segregated grout from some locations of the deficient tendons some concerns on future corrosion progression after initial repairs have been raised.
 

There was interest in gauging the extent to which corrosion may develop for repaired PT systems in which void spaces have been re-grouted with dissimilar grouting materials and where differences in pore water chemistry may contribute to corrosion development. This study aims to determine the extent to which corrosion of strand in dissimilar grout materials can form. The research was to identify corrosion mechanisms that may occur in tendons with ideal and deficient/partial repair conditions.
 

Grout in failed post-tensioned tendons in Florida with varying extent of segregation was characterized as having different properties and chemistry which may promote corrosion activity. Although early repair procedures have been implemented in a bridge to remove the most severely segregated grout from some locations of the deficient tendons some concerns on future corrosion progression after initial repairs have been raised.
 

There was interest in gauging the extent to which corrosion may develop for repaired PT systems in which void spaces have been re-grouted with dissimilar grouting materials and where differences in pore water chemistry may contribute to corrosion development. This study aims to determine the extent to which corrosion of strand in dissimilar grout materials can form. The research was to identify corrosion mechanisms that may occur in tendons with ideal and deficient/partial repair conditions.
 

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