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Effect of Superplasticizers on Concrete-Steel Bond Strength
Brettmann, Barie B. Darwin, David Donahey, Rex C.
Brettmann, Barie B.
Darwin, David
Donahey, Rex C.
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Abstract
The effects of superp 1 asti ci zers on concrete-steel bond strength are studied. Key variables are degree of consolidation, concrete slump, both with and without a superplasticizer, concrete temperature, and bar position. #8 deformed reinforcing bars were used with a 2 in. cover and a 10 in. bonded length. Concrete slumps ranged from 1-3/4 in. to 9 in. Three specimen depths were used. All specimens were modified cantilever beam specimens. Based on the experimental results, high slump superplasticized concrete pro vi des a 1 ower bond strength than 1 ow slump concrete of the same strength. Superpl asti ci zed concrete pro vi des a higher bond strength than high slump regular concrete with the same slump and water-cement ratio. Vibration of high slump concrete increases the bond strength compared to high slump concrete without vibration. Bond strength decreases as the amount of concrete below a bar increases, but the greatest effect appears to occur with top-cast (i.e. upper surface) bars.
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1984-04
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University of Kansas Center for Research, Inc.
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Brettmann, B.B., Darwin, D., Donahey, R.C., "Effect of Superplasticizers on Concrete-Steel Bond Strength," SL Report 84-1, The University of Kansas Center for Research Inc., Lawrence, KS, April 1984, 35 pp