03 30 00 Cast-in-Place Concrete

Category Archives: 03 30 00 Cast-in-Place Concrete

The Track to Span 3: Genesis of the innovative Manhattan West Platform

Photos courtesy Entuitive

The Manhattan West Platform is the first stage in a vibrant urban development that will serve as the foundation for public and new commercial space. This article discusses the unique structural challenges in designing an innovative platform structure over the tracks leading into New York City’s Penn Station while minimizing, or completely avoiding, disruption of rail service to North America’s busiest rail corridor.

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Richardsville Elementary – NET ZERO

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September 2010 marked the grand opening for Richardsville Elementary, the First Net-Zero Insulated Concrete Form School in the U.S. Warren County School district, the school board responsible for Richardsville, has been building energy efficient schools that are being recognized for their innovation across the United States.

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Mix Design Fundamentals: Considerations for concrete for slabs-on-ground

Photo © BigStockPhoto/Theerapol Pongkangsananan

Interior concrete should not crack or curl excessively requiring grinding before the flooring can be installed; exterior concrete should not crack or deteriorate prematurely from freeze-thaw cycles. Some argue concrete will always crack, and nothing can be done about it. This is most often an excuse when poor design or poor placement has resulted in excessive cracking or the real problem is too much mix design water, lack of welded wire reinforcement, or too little aggregate and poor curing methods.

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How Thin is Too Thin?

Typical flat-plate construction. Photos courtesy SGH

Evaluating slab thickness in reinforced concrete flat-plate construction
by Dimitri Papagiannakis, PE

Reinforced concrete flat-plate construction is popular among mid- and high-rise residential construction projects. It provides a great deal of flexibility in the placement of the structure’s vertical load-carrying elements (i.e. columns and walls) without sacrificing the efficiency of the floor framing—as could potentially be the case with steel or masonry.

In the project’s early stages, structural engineers are often asked by architects …

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Specifying Steel Fibers for Concrete Floors

Photo © BigStockPhoto/Jacek Sopotnicki

Thin, short strands of steel are being increasingly specified as reinforcement in ground-supported slabs and in composite steel deck-slabs. Structural engineers are still figuring out how best to design with these components, but specifiers need to think about how to define this material in the contract documents. Dosage is critical, for one thing, but not all fibers are alike. Without specifying other key details, one can end up with concrete that contains the specified mass of fibers, but does not fulfill the designer’s intentions.

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