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Title |
Bond Characteristics of High-Strength Light-Weight Concrete
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Abstract |
Recently, it is increased the use of High-Strength Light-Weight Concrete(HLC) in the high-rise buildings and mega-structures. But there are a few research on the bond behavior of HLC, so it need to study about that. The present study was performed to investigate the bond characteristics of HLC. Major test variables include concrete compressive strength (f′c), concrete cover(C), bond length (ℓdb), and bar diameter(db). Test results indicate that the bond stress of HLC is increased with the increment of √f′c and concrete cover, bond stress is decreased with increment of bond length and bar diameter. And the final failure mode such as splitting or pullout failure is significantly affected by the concrete cover to bar diameter ratios (C/db). Test results were compared with ACI code and other proposed equations. The bond stress of HLC is higher than that of normal-strength normal-weight concrete, but lower than that of high-strength normal-weight concrete. Considering the present test results, modification factor(λ=1.3) of bond length in ACI 318-95 code for light-weight concrete is may have to be reviewed to apply to HLC.
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