United States Department of Transportation
i
Report A : self-consolidating concrete (SCC) for infrastructure elements - shear characteristics.
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2012-08-01
[PDF-3.99 MB]
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Edition:Final report.
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Abstract:Because of its unique ability to maintain high flow-ability and remain homogeneous,
self-consolidating concrete (SCC) has the potential to significantly reduce the costs
associated with civil infrastructure; however, the use of higher paste and lower coarse
aggregate volumes than non-SCC concretes raises concerns about the structural implications
of using SCC. Of particular concern is the effect of concrete compressive strength, and
aggregate type, shape, and content level on shear strength of SCC mixes. This research
focused on the components that contribute to the concrete’s ability to provide shear
resistance, in particular, shear provided by aggregate interlock. Variables investigated by
push-off tests to determine the shear contribution from aggregate interlock included concrete
compressive strength (6 and 10 ksi [41.3 and 68.9 MPa] target), coarse aggregate type
(limestone and river gravel), and volumetric content level of the coarse aggregate portion
(36%, 48%, 58%, and 60%). Post-failure digital imaging software was used to confirm fresh
concrete parameters in the hardened state as well as check for variability and the impact on
shear. Additional attention was given to the global contributions of shear by the concrete in
larger scaled tests of pre-stressed beam members. The results were used to assess the
appropriateness of designing Missouri Infrastructure elements using the current AASHTO
LRFD Bridge Design Specification for shear and while using typical Missouri SCC batch
proportions and materials.
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