Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
FHWA Special Study: Post-Tensioning Tendon Grout Chloride Thresholds
Elevated levels of chloride were recently discovered in a commercially available pre-bagged grout product made for Elevated levels of chloride were recently discovered in a commercially available pre-bagged grout product made for post-tensioned (PT) tendons. Chloride concentrations were reported to be as high as 5.27 percent by weight of cement. These numbers exceed the current limits set by all of the domestic and international regulatory committees. For example, the chloride limits for prestressed concrete imposed by American Concrete Institute committees are either 0.06 percent water-soluble chloride by weight of cement or 0.08 percent acid-soluble chloride by weight of cement. Chloride threshold is defined as a minimum chloride concentration needed to induce corrosion. However, there is limited information reported in the literature pertaining to actual chloride threshold of seven-wire PT strands. For this reason, the Federal Highway Administration sponsored a 6-month accelerated corrosion testing program to determine chloride threshold(s) of PT strands exposed to chloride-contaminated grout.
FHWA Special Study: Post-Tensioning Tendon Grout Chloride Thresholds
Elevated levels of chloride were recently discovered in a commercially available pre-bagged grout product made for Elevated levels of chloride were recently discovered in a commercially available pre-bagged grout product made for post-tensioned (PT) tendons. Chloride concentrations were reported to be as high as 5.27 percent by weight of cement. These numbers exceed the current limits set by all of the domestic and international regulatory committees. For example, the chloride limits for prestressed concrete imposed by American Concrete Institute committees are either 0.06 percent water-soluble chloride by weight of cement or 0.08 percent acid-soluble chloride by weight of cement. Chloride threshold is defined as a minimum chloride concentration needed to induce corrosion. However, there is limited information reported in the literature pertaining to actual chloride threshold of seven-wire PT strands. For this reason, the Federal Highway Administration sponsored a 6-month accelerated corrosion testing program to determine chloride threshold(s) of PT strands exposed to chloride-contaminated grout.
FHWA Special Study: Post-Tensioning Tendon Grout Chloride Thresholds
S. K. Lee (Autor:in) / J. Zielske (Autor:in)
2014
200 pages
Report
Keine Angabe
Englisch
Physical & Theoretical Chemistry , Nonferrous Metals & Alloys , Corrosion & Corrosion Inhibition , Construction Management & Techniques , Construction Materials, Components, & Equipment , Structural Analyses , Grout , Chlorides , Bridges , Cement , Structural integrity , Accelerated life tests , Corrosion testing , Low carbon steels , Sea water , Surface reactions , Corrosion resistance , Ultraviolet radiation , Sodium chloride , Chemical bonds , Rock salt , Interfaces , Electron microscopy , Bonded joints , Chemical analysis , Strength(Mechanics) , Post-tensioned(PT)
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