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Section 3: Concrete Deck Slabs on Adjacent-Framed Beams (Slab Beams and Box Beams)

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Materials

Use Class S concrete (fc ́ = 4.0 ksi). Refer to district-specific corrosion protection requirements for regions where bridge decks are exposed to de-icing agents and/or saltwater spray with regularity. If thus required, use Class S (HPC) concrete.

Use Grade 60 reinforcing steel or deformed welded wire reinforcement (WWR) meeting the requirements of ASTM A1064. Refer to district-specific corrosion protection requirements for regions where bridge decks are exposed to de-icing agents and/or saltwater spray with regularity. If thus required, use one of the following types of corrosion resistant reinforcement (refer also to Item 440):

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  • Epoxy-Coated Reinforcing Steel meeting the requirements of ASTM A775 or A934
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  • Epoxy-Coated WWR meeting the requirements of ASTM A884 Class A or B
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  • Hot-Dip Galvanized Reinforcing Steel
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  • Glass Fiber Reinforced Polymer (GFRP) Bars; The design for GFRP reinforcement in bridge decks must adhere to the AASHTO LRFD Guide Specifications for GFRP-Reinforced Concrete Bridge Decks and Traffic Railings.
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  • Dual Coated Reinforcing Steel meeting the requirements of ASTM A1055
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  • Low Carbon/Chromium Reinforcing Steel meeting the requirements of ASTM A1035 Gr 100 Ty CS
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  • Stainless Reinforcing Steel meeting the requirements of ASTM A955 Ty 316LN, XM-28, 2205, or 2304; Use only for extreme chloride exposure in coastal areas.
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Geometric Constraints

TxDOT standard composite concrete slabs are 5 in. thick, minimum.

Use 2.5-in. top clear cover.

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Design Criteria

For transverse reinforcement, use #5 bars spaced at 6 in. maximum.

For longitudinal reinforcement, use #4 bars spaced at 12 in. maximum.

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Detailing

Place transverse reinforcement parallel to the skew for skews up to 30°.

Use controlled joints at bent centerlines when the slab is continuous over bents.

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