New Johnston High School, Johnston, IA
DE Fiberworks, Inc. - Concrete Fiber Reinforcement
563.340.7065

New Johnston High School, Johnston, IA

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Forta Ferro®, a macro-synthetic fiber reinforcement system was used in all concrete floors during construction of the New Johnston High School in Johnston, IA. Construction of the multi-level building commenced in September 2014 and is scheduled for completion in April 2017. The building is approximately 369,000 square-feet with a capacity of 1,800 students in grades 10-12.
Description

New Johnston High School, Johnston, IA

Forta Ferro®, a macro-synthetic fiber reinforcement system was used in all concrete floors during construction of the New Johnston High School in Johnston, IA.  Construction of the multi-level building commenced in September 2014 and is scheduled for completion in April 2017.  The building is approximately 369,000 square-feet with a capacity of 1,800 students in grades 10-12.  The project is designed by FRK Architects + Engineers of West Des Moines, IA.  FRK has been the Johnston Community School District’s architecture firm for more than 20 years.  FRK is partnering with Perkins & Will, a Chicago firm that specializes in school construction.  Stahl Construction serves as the General Contractor.  Cameron Mitchell Inc. is the subcontractor that has placed all the concrete for the slabs-on-grade and slabs-on-deck and Liberty Ready Mix supplied all the Forta Ferro fiber reinforced concrete.

 

 

Macro-synthetic fiber was approved as an alternate to welded wire fabric (WWF) for temperature and shrinkage reinforcement for the project.  Forta Ferro® was selected as a superior product because of its overall performance that includes excellent mixing and finishing characteristics.  An advantage of Forta Ferro is 3-dimensional reinforcement throughout the concrete.  A unique design feature of the New Johnston High School project is geothermal heating and cooling.  Forta Ferro provides top to bottom reinforcement in the concrete that surrounds the geothermal piping that is encased in the concrete floor and deck slabs.  Forta Ferro requires no additional time and labor to install and eliminates tripping hazards that are present when using WWF.  Please feel free to contact DE Fiberworks at dave@defiberworks.com or (563) 340-7065 if you have any additional questions.

 

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Did You Know?

Concrete is widely recognized as an extremely versatile, cost-effective construction material?

 

Concrete is widely recognized as an extremely versatile, cost-effective construction material. Yet it is also beset with some drawbacks that are inherent to its composition.  By generally accepted engineering standards, concrete is relatively brittle and lacks ductility.  Intertwined with these problems is concrete’s propensity to crack in both its plastic (early-age) and hardened (long-term) state.  Early-age cracks are microscopic fissures caused by the intrinsic stresses created when the concrete settles and shrinks over the first 24 hours after being placed.  Long-term cracking is in part caused by the drying shrinkage that transpires over time.  In either case, these cracks can jeopardize the overall integrity of the concrete and not allow it to maintain – or possibly ever attain – its maximum performance capability.

 

This is the basic reason reinforcement in concrete is required.  Irregular cracks are unsightly and difficult to maintain but generally do not affect the integrity of the concrete.  Joints in concrete slabs are simply pre-planned cracks that are created by forming, sawing, or tooling.  Concrete slabs that are designed for serviceability typically use reinforcement such as deformed reinforcing steel bars (rebar) or welded wire fabric (WWF) to hold cracks tight.  The primary function for the reinforcement is to maintain aggregate interlock for load transfer and improve joint stability.  Rebar and WWR do not inhibit the formation of cracks, but if properly positioned provide reinforcement once a crack has developed.  Fiber reinforcement can provide the same function, is distributed throughout the cross-section of the concrete and distributes the stresses attributed to shrinkage throughout the panel making the joints much more stable. This distribution of fibers provides a totally reinforced cross-section of concrete and changes the way the concrete works.