Span Length

15′ 27′ 39′ 51′ 63′ 75′ 87′ Span Length OR 12 15′ - 30′ OR 15 20′ - 40′ OR 18 25′ - 50′ OR 21 30′ - 55′ OR 26 40′ - 70′ OR 30 55′ - 85′

ODOT Section Properties (gross)

ODOT Voided Slab section properties show.  Typical product sections are 4′-0″ wide.

Type Depth (in) Area (in2) Yb (in4) Ixx (in4) Iyy (in4) PLF @ 165
OR 12 12" 576 5.9 6833 106037 661
OR 15 15" 569 7.4 12741 110462 653
OR 18 18" 628 8.9 21585 129072 721
OR 21 21" 703 10.4 34097 142120 807
OR 26 26" 846 12.9 63587 182246 972
OR 30 30" 931 14.9 97301 202854 1069

Span Length

15′ 25′ 35′ 45′ 55′ 65′ 75′ Span Length WA 12 15′ - 30′ WA 18 30′ - 45′ WA 24 45′ - 65′ WA 26 55′ - 70′ WA 30 60′ - 75′

WSDOT Section Properties (gross)

WSDOT Voided Slab section properties show.  Typical product sections are 4′-0″ wide. WA30 4′-3 3/4″ wide.

Type Depth (in) Area (in2) Yb (in4) Ixx (in4) Iyy (in4) PLF @ 165
WA 12 12" 568 6.0 6833 106037 652
WA 18 18" 658 8.9 21713 136687 756
WA 24 24" 748 11.9 47970 168440 859
WA 26 26" 844 12.9 47970 186585 969
WA 30 30" 1033 14.9 104323 104323 1168

Product Information

Standard voided slab design is typically governed by the State, County or Agency design criteria. In the Pacific Northwest using a nominal 4′ wide voided slab for depths up to 30″ provides the most cost effective use of the section.

“OR” – ODOT Sections

“WA” – WSDOT Sections

Product Information

Standard voided slab design are typically governed by the State, County or Agency design criteria.   In the Pacific Northwest using a nominal 4′ wide voided slab for depths up to 30″ provides the most cost effective use of the section.

“OR” – ODOT Sections

“WA” – WSDOT Sections

Standard Design Options

  • Integral precast curb options are available.
  • Slab to Slab connectors: Tie Rods or Weldments
  • Available top of slab finishes: UHPC Driving Surface ready or roughened to receive overlay
  • Rail Post Anchor Connections
  • Utility hangers
  • Integrated abutment and wing wall packages
  • Recesses for bat crevices
Technical drawing of a 12-inch solid slab profile, 400 by 120 units, with circular end details, labeled Technical drawing of a 15-inch voided-solid slab featuring three circular holes with dimensioned measurements. Cross-section diagram of an 18-inch voided slab with three circular voids, per ODOT standard, showing dimensions. Voided-solid slab technical drawing showing a 48-inch-wide slab with two 15-inch-diameter circular voids, per ODOT specifications. Technical drawing of a 36-inch voided-slab with two circular voids, showing dimensions and ODOT specifications. Technical drawing of a 12-inch solid slot template labeled W9507, showing die-cut dimensions with measurement arrows. Title block technical drawing of a 12-inch vented block with three circular holes and dimensioned specifications labeled WSDOT. A technical drawing of a 24-inch vented slot metal plate with two circular holes and detailed dimension measurements. Technical drawing of a 28-inch vented slot template (WSD007) showing two circular cutouts with dimensioned specifications. Technical drawing of a 30-inch Venturi slot component labeled WB007, showing a dark rectangular plate with two circular openings and dimension annotations. Two workers in safety vests and hard hats lift a large concrete slab suspended by a crane. Construction worker in a safety vest operating a plate compactor on a concrete slab with embedded metal studs. Three construction workers in high-visibility vests and hard hats supervise a large concrete beam suspended by crane cables at a dry, grassy construction site. Two workers guide a crane as it lifts a large voided-solid concrete slab with a ribbed end face into position. A yellow crane lifts a long concrete slab onto a flatbed truck at a tree-lined construction site. Worker in yellow safety gear pours concrete into a rebar-lined slab form while constructing a voided-solid slab. Concrete plant hopper feeding a conveyor belt as workers in hard hats oversee voided-solid slab production.

3D Viewer

3D Viewer Tools

 

  • 3D Viewer Functions:
  • Move, Span, Zoom Assemblies
  • Isolate Single Components in View
  • Explode Assembly Single Components
  • Use Markup to Sketch Details
  • General Measurements for Concept
  • Print Views

Need More Info?

We Are Here to Help

 

Have a question, need a budget or detailed schedule?  Knife River sales team is ready to discuss precast solutions for your project.  Reach out to our staff below :

A smiling bearded man in a black polo shirt with the Knife River logo on the chest.

Andy Roberts

Outside Sales, ID & MT

phone

509.904.8610
Nikolaus Mixon, Outside Sales for Oregon and California at Knife River Prestress.

Nikolaus Mixon

Outside Sales, OR & CA

phone

541.257.7412
Alex Sari, Outside Sales for Washington and Alaska at Knife River Prestress.

Alex Sari

Outside Sales, WA & AK

phone

(509) 992-5614

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