A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development of a Standard Accelerated Corrosion Test for Acceptance of Post-Tensioning Grouts in Florida
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.
Development of a Standard Accelerated Corrosion Test for Acceptance of Post-Tensioning Grouts in Florida
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.
Development of a Standard Accelerated Corrosion Test for Acceptance of Post-Tensioning Grouts in Florida
A. R. Pacheco (author) / A. J. Schokker (author) / H. R. Hamilton (author)
2006
108 pages
Report
No indication
English
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