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51314-4225-Corrosion of Post-Tensioned Tendons in Deficient Grout

Picture for Corrosion of Post-Tensioned Tendons in Deficient Grout
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Product Number: 51314-4225-SG
ISBN: 4225 2014 CP
Author: Kingsley Lau
Publication Date: 2014
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Recent corrosion failures of post-tensioned (PT) tendons in Florida utilizing pre-packaged low-bleed specified grout products have spurred the need to evaluate what mechanisms were involved to cause the failure and to determine to what extent is the problem in PT tendons with similar materials . Severe corrosion was accommodated by segregated grout that was characterized as having high moisture content low total chloride content high free sulfate concentrations and high pore water pH. Accumulation of bleed water and grout void formation considered sometimes as the cause of PT strand corrosion were not consistently present with corrosion formation in the recent tendon failures. The most severe segregated grout had putty-like consistency. Less strongly manifested forms of segregated grout had grout characterized as friable and chalky. Elucidation of the role of the pore water chemistry of these deficient grouts in the corrosion mechanism is needed so that appropriate inspection and management decisions can be made.
Recent corrosion failures of post-tensioned (PT) tendons in Florida utilizing pre-packaged low-bleed specified grout products have spurred the need to evaluate what mechanisms were involved to cause the failure and to determine to what extent is the problem in PT tendons with similar materials . Severe corrosion was accommodated by segregated grout that was characterized as having high moisture content low total chloride content high free sulfate concentrations and high pore water pH. Accumulation of bleed water and grout void formation considered sometimes as the cause of PT strand corrosion were not consistently present with corrosion formation in the recent tendon failures. The most severe segregated grout had putty-like consistency. Less strongly manifested forms of segregated grout had grout characterized as friable and chalky. Elucidation of the role of the pore water chemistry of these deficient grouts in the corrosion mechanism is needed so that appropriate inspection and management decisions can be made.
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