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Evaluation Of Strand Transfer And Development Lengths In Pretensioned Girders With Semi-Lightweight Concrete, Robert J. Peterman, J. A. Ramirez, J. Olek
Evaluation Of Strand Transfer And Development Lengths In Pretensioned Girders With Semi-Lightweight Concrete, Robert J. Peterman, J. A. Ramirez, J. Olek
JTRP Technical Reports
Indiana has been using lightweight aggregate consisting mostly of expanded shale in the production of prestressed concrete bridge girders for several projects. The lightweight aggregate has been used as partial replacement for regular gravel or crushed limestone coarse aggregate. This semi-lightweight concrete weighs around 2080 kg/m .
In a study sponsored by the FHWA, the current AASHTO equations for the calculation of transfer and development lengths of prestressing strand were found to be unconservative in the case of lightweight concrete members with unit weight less than 1 920 kg/m3 . This finding raises a question regarding the applicability of the …