Journal of the Society of Materials Science, Japan
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
Basic Study on Pretensioned Members with Ultra-High Strength Concrete
Yoshihiro HISHIKIToshimichi ICHINOMIYAToshio OHNOKazunori TAKADAYohei TAIRAHideki FUJII
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2004 Volume 53 Issue 6 Pages 678-685

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Abstract
Ultra-high-strength concrete (UHSC) with compressive strength of 150N/mm2 makes it possible to reduce the weight of prestressed concrete structures. Particularly in case that UHSC is applied to pretensioned members, high bond strength can also be expected to reduce the transfer length. Considerable autogenous shrinkage of UHSC, however, reduces effective prestress and causes cracking due to the restraint of reinforcing steel. A new type UHSC with less autogenous shrinkage was developed, and its basic characteristics were investigated. Prestressing tests parameterizing the type of prestressing steel and the amount of introduced stress were also conducted to determine transfer length and to verify the effect of reduced autogenous shrinkage. Furthermore the predictability of effective prestress considering shrinkage and creep strain was studied.
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