VOIDED CONCRETE SLABS
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Voided Concrete Slab SystemS

A Better Solution for the Bottom Line

 

A fully integrated voided concrete slab system.

Going from system to in-place solution without delay.

CobiaxUSA void formers are incorporated into the building process on the construction site (in-situ concrete), according to the construction requirements. They can also be incorporated as fully precast elements, produced in a controlled environment, even in a combination with other precast elements. CobiaxUSA plastic void formers are set within wire alignment cages to be placed in specified grids leaving solid areas around columns. An initial layer of concrete, either cast-in-place or precast, prevents void buoyancy and firmly establishes void positioning. Grids accommodate any specified MEP and post-tensioning strand. Finally, the second layer of concrete completes the slab by flowing into the correct static structure.

On the job site, time and space are at a premium and builders need systems that save both. The beauty of CobiaxUSA voided concrete slabs is in their construction-friendly design. Voids arrive at the job site ready for quick assembly and installation in a wide range of void configurations to accommodate the installation of MEP and post-tensioning strand.

 
A system flexible enough to solve many common problems.  Ask for a technical presentation of how CobiaxUSA can provide a wide range of system options to solve common design and construction challenges including concrete weight and structural depth reductions.

A system flexible enough to solve many common problems. Ask for a technical presentation of how CobiaxUSA can provide a wide range of system options to solve common design and construction challenges including concrete weight and structural depth reductions.

Tested and approved.

The technology offered by Cobiax USA, Inc. can be effectively incorporated in a voided concrete flat plate slab and is in conformity with the existing concrete construction standards and design procedures.
— MICHAEL A. RUSSILLO, P.E.

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RESEARCH

Research topics included:

  • Structural security

  • Bending

  • Shear force

  • Punching

  • Dynamic behavior

  • Fire protection

  • Bond

  • Serviceability

  • Deflection

  • Cracking

  • Shrinking & Creep

  • Phonic behavior

  • Corrosion

  • Core thermal activation

  • Other aspects

  • Execution details

  • Recycling

  • CO2 savings


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PERFORMANCE

Tested and Proven. Bending tests each for solid and voided slab samples confirmed that voided concrete slab behavior, using the systems offered by Cobiax USA, Inc. does not differ from a solid slab.

Extensive research conducted around the world has demonstrated voided concrete slab performance. Essential structural research has been conducted at universities in Europe and the United States to ensure that voids, and completed structures that will contain them, will perform as expected.

Research methodologies included:

  • Academic

  • Theoretic

  • Lab testing

  • On-site assessments



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FIRE PROTECTION

Fire Protection Tested. International building code (IBC, chapter 7) mandates two prescriptive parameters for specific fire ratings: minimum effective thickness, and concrete cover on rebar.

The Concrete Reinforcing Steel Institute (CRSI) sponsored and reported on a full-scale fire test. Summarizing test results: the thinnest voided concrete slabs meet the minimum effective thickness and then it is dependent on the cover to dictate the fire rating.