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

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):
  • Epoxy-Coated Reinforcing Steel meeting the requirements of ASTM A775 or A934
  • Epoxy-Coated WWR meeting the requirements of ASTM A884 Class A or B
  • Hot-Dip Galvanized Reinforcing Steel
  • 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.
    Specify a minimum modulus of elasticity for GFRP of 7,500 ksi in the plans.
  • Low Carbon/Chromium Reinforcing Steel meeting the requirements of ASTM A1035 Gr 100 Ty CS
  • Stainless Reinforcing Steel meeting the requirements of ASTM A955 Ty 316LN, XM28, 2205, or 2304; Use only for extreme chloride exposure in coastal areas.

Geometric Constraints

TxDOT standard composite concrete slabs are 5 in. thick, minimum.
Use 2.5 in. top clear cover.

Design Criteria

For transverse reinforcement, use #5 bars spaced at 6 in. maximum.
For longitudinal reinforcement, use #4 bars spaced at 12 in. maximum

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.