High Performance Concrete Specifications and Practices for Bridges (2013) / Chapter Skim
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Specifications for concrete to be used in bridge structures have traditionally been prescriptive in nature, meaning that the constituent materials of the concrete and their relative proportions are stated like a recipe for a cake. In the 1990s, FHWA began to introduce the concept of performance specifications, which designate required results rather than means.
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2 States' prescriptive specifications limit the total amount of cementitious materials (cement plus supplemental cementitious materials) that may be used in the concrete, along with the percentages of supplementary cementitious materials that may be included.
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