Healthy Concrete Systems: Defending design intent


Construction documents need to be clear, concise, correct, and complete—but is this enough to fend off the twists and turns of executing the contract for construction? One may begin with the very best in design intent, but it is the responsibility of the entire project team to understand and adhere to this in order for it to become a reality. Too often, some of the team members will alter the intended design to accommodate their own business advantage.

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A faster, simpler way to a Level 5 finish

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Drywall is often misperceived as a building material that does not demand the skillful manipulation of a traditional construction material. However, anyone who has worked with drywall knows the product is not so cooperative.

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Specifying the concrete slab to be polished


One of the biggest mistakes a designer can make when specifying polished concrete slabs is to state, “Concrete for polished concrete, including formwork, reinforcement, concrete materials, mixture design, placement procedures, initial finishing, and curing is specified in Section 03 30 00 Cast-in-Place Concrete.”

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Bridging the Specification Gap between Divisions 03 and 09: Concrete and floorcovering associations unite

Photo © Michael Marxer ( Photo courtesy Mapei

Division 03 specifies concrete floor surface flatness requirements to be installed by the concrete contractor. However, Division 09 specifies the concrete floor surface flatness for the flooring installer that must be met before installing the floorcovering. Cooperation between the American Society of Concrete Contractors (ASCC) and six flooring associations has led to a solution for bridging the specification gap between Divisions 03 and 09.

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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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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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