United States Department of Transportation
i
High-strength self-consolidating concrete (SCC) and high-volume fly ash concrete (HVFAC) for infrastructure elements : implementation.
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2014-08-01
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[PDF-7.95 MB]
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Abstract:Because of its unique nature, high-strength self-consolidating concrete (HS-SCC) has the potential to significantly reduce costs
associated with transportation-related infrastructure, benefiting both MoDOT and the residents of Missouri. HS-SCC is a highly
flowable, nonsegregating concrete that can be placed without any mechanical consolidation, and thus has the following advantages
over conventional concrete: decreased labor and equipment costs during concrete placement, decreased potential for and costs to
repair honeycombing and voids, increased production rates of precast and cast-in-place (CIP) elements, and improved finish and
appearance of cast and free concrete surfaces.
In addition to SCC, innovative materials, such as high volume fly ash concrete (HVFAC), also provide a significant potential to
produce more cost effective mix designs for CIP concrete. Since the 1930’s, fly ash – a pozzolanic material – has been used as a
partial replacement of portland cement in concrete to improve the material’s strength and durability, while also limiting the amount of
early heat generation. From an environmental perspective, replacing cement with fly ash reduces the concrete’s overall carbon
footprint and diverts an industrial by-product from the solid waste stream (currently, about 40 percent of fly ash is reclaimed for
beneficial reuse and 60 percent is disposed of in landfills). The objective of this research is to provide an implementation test bed and
showcase for the use of sustainable and extended service life concrete.
In this implementation study for Missouri Bridge A7957, a level of 50% fly ash to cement proportions was utilized as well as
normal strength self-consolidating concrete (NS-SCC) and HS-SCC in the load carrying elements to showcase the use of these
innovative materials.
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