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

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Materials

Use Class S concrete (= 4.0 ksi). If the slab will be subjected regularly to de-icing agents based on district policy, use Class S (HPC) concrete.

Use Grade 60 reinforcing steel. Use uncoated reinforcing steel unless the slab will be subjected regularly to de-icing agents based on district policy, in which case use epoxy-coated reinforcing steel.

Optional reinforcements allowed:

  • Glass Fiber Reinforced Polymer (GFRP) bars are allowed as a substitute for epoxy coated reinforcing steel. 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.
  • Deformed welded wire reinforcement (WWR) meeting the requirements of ASTM A1064 is allowed as a substitute for uncoated Grade 60 reinforcing steel.
  • Dual coated reinforcing steel meeting the requirements of ASTM A1055 is allowed as a substitute for epoxy coated reinforcing steel.
  • Low carbon/chromium reinforcing steel meeting the requirements of ASTM A1035 Gr 100 is allowed as a substitute for epoxy coated reinforcing steel.
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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 degrees.

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


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