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Bond of Reinforcement to Revibrated Concrete
Altowaiji, Wisam A. K. Darwin, David Donahey, Rex C.
Altowaiji, Wisam A. K.
Darwin, David
Donahey, Rex C.
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Abstract
The effects of revibration on concrete-steel bond strength are studied. Key variables are concrete slump, bar position, and the time interval between initial vibration and revibration. No 8 (25 mm) deformed reinforcing bars were used with a 2 in. (51 mm) cover and a 10 in. (254 mm) bonded length. Concrete slumps ranged from 2 3/4 to 7 1/2 in. (70 to 190 mm). Two specimen depth were used. All specimens were modified cantilever beam specimens.
The experimental results show that revibration is not universally beneficial to conrete-steel bond. Revibration appears to improve bond strength for top-cast bars placed in high-slump concrete. Revibration may, however, severely damage bond strength for bars cast in well-consolidated, low-slump concrete. Revibration is almost universally detrimental to the bond strength of bottom-cast bars. Overall, revibration tends to reduce the differences in bond strength caused by differences in slump and bar position.
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Date
1986
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American Concrete Institute
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Altowaiji_1986.pdf
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Keywords
Bond (concrete to reinforcement), Concrete construction, Consolidation, Cover, Reinforced concrete, Reinforcing steels, Revibration, Vibration, Workability
Citation
Altowaiji, W.A.K., Darwin, D., and Donahey, R.C., "Bond of Reinforcement to Revibrated Concrete," ACI Journal Vol. 83, No. 94, November-December 1986, pp. 1035-1042.