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Effect of Amount of Coarse Aggregate and Pozzolans on Shear Behavior of Prestressed Concrete Beams
|作者:||林建宏||關鍵字:||應用研究;beam;土木水利工程類;梁;剪力強度;粗骨材;卜作嵐;coarse aggregate;shear strength;pozzolans||摘要:||
High-flowability concrete has better workability and can be used to improvethe concrete quality cast in the reinforced concrete members. Bond betweenhigh-flowability concrete and reinforcement is also better than that innormal concrete. To achieve high flowability, usually it is necessary toreduce the coarse aggregate content in the concrete. However, this couldresult in inferior ductility and durability of hardened concrete, and largerlong-term volume change (creep and shrinkage) of concrete. It may alsoreduce the contribution of aggregate interlock as far as prestressed beamshear strength is concerned. In addition, pozzlans are frequently added inhigh-flowability concrete; not only to obtain higher flowability of the freshconcrete, but also to reduce the crack width of hardened concrete. It is theaim of this study to investigate the effects of coarse aggregate content andamount of pozzolans on prestressed beam shear behavior. Tests on shearstrength of prestressed concrete beams are needed in this study. A total ofthirty-seven prestressed beam specimens will be made and tested. The testvariables include the amount of prestress, concrete strength, coarseaggregate content, amount of pozzolans, and amount of shear reinforcement.
|Appears in Collections:||土木工程學系所|
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