High Performance Concrete Specifications and Practices for Bridges (2013) / Chapter Skim
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Pages 25-29
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From page 25... ...
25 chapter four CURRENT SPECIFICATIONS AND PRACTICES FOR PRECAST, PRESTRESSED CONCRETE GIRDERS AND DECK PANELS stated. Other specified properties such as slump and air content are similar to corresponding values for CIP deck concrete.
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From page 26... ...
26 7 8 2 2 6 8 0 17 5 2 2 2 11 11 2 1 11 10 4 19 3 2 4 0 0 5 10 15 20 25 30 No. of Agencies Characteristic Performance Specifications Prescriptive Specifications FIGURE 11 Characteristics included in performance specifications and considered in prescriptive specifications for precast, prestressed concrete beams.
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From page 27... ...
27 To obtain information about the actual practices, agencies were asked to identify the percentage usage of SCMs in precast, prestressed concrete beams and deck panels. The number of responses for each percentage range is summarized in Tables 9 and 10 for beams and deck panels, respectively.
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From page 28... ...
28 specifications limit the maximum temperature to 160° F for either the enclosure or the concrete during heat curing. TESTING AND ACCEPTANCE PRACTICES Many agencies reported that the only requirement for acceptance of new HPC mixtures for precast, prestressed concrete components is compressive strength.
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From page 29... ...
29 on information from the biannual bridge inspections. One state responded that the only formal evaluation occurs in connection with research projects.
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