Section 4: Concrete Deck Slabs on Slab Beams, Double-Tee Beams, and Box Beams
Anchor: #i1355809Materials
Use Class S concrete (ƒ'c= 4.0 ksi). If the slab will be subjected regularly to de-icing chemicals based on district policy, add the following plan note: For Class S concrete in slab, use one of the mix design options 1 through 5 required by Item 421.
Use Grade 60 reinforcing steel. Use uncoated reinforcing steel unless the slab will be subjected regularly to de-icing chemicals based on district policy, in which case use epoxy-coated reinforcing steel.
Waterproof slabs with one of the two classes of treatment specified in Item 428, “Concrete Surface Treatment.”
Anchor: #i1355855Geometric Constraints
TxDOT standard composite concrete slabs are 5 in. thick, minimum.
Use 2-in. top clear cover. If the slab will be subjected regularly to de-icing chemicals based on district policy, use 2.5-in. top clear cover.
Anchor: #i1355892Design Criteria
For transverse reinforcement, use #5 bars spaced at 6-in. maximum for double-tee and slab beam bridges and #4 bars spaced at 6 in. maximum for box beam bridges.
For longitudinal reinforcement, use #4 bars spaced at 12 in. maximum.
Anchor: #i1355926Detailing
Use controlled joints at bent centerlines when the slab is continuous over bents.