CONCRETE CONSTRUCTION is conducting a field test to learn more about shrinkage and curling in warehouse floors. A 60,000-square-foot warehouse floor in Bartlett, Ill., was divided into 5000- to 10,000-square-foot sections in mid-February 2009, each receiving a different mix design. Naturally, curling and movement changes will vary in regard to the specific mix designs, as well as the ambient conditions, and each will be monitored for the next two years. Our goal is to measure shrinkage, plot curling along joint lines, and moisture movement through the floor with different finishes during the curing cycle. In the end, the goal of this field test is to provide you with useful information for floor construction.Over the course of the next two years, CONCRETE CONSTRUCTION will provide Field Test updates every six months, with the final analyses published in 2011.Specific details involving the field test, as well as the individual mix designs, can be found in "Researching Warehouse Floors", the first update since the floors were poured.

Project Participants Steering group: Matt D'Ambrosia, CTLGroup Concrete Construction magazine Jack Gibbons, Concrete Reinforcing Steel Instittue Pat Harrison, SSI: Structural Services Inc. Jerry Holland, SSI: Structural Services Inc. Howard Kanare, CTLGroup Kevin MacDonald, Cemstone Greg Scurto, Scurto Cement Wayne Walker, SSI: Structural Services Inc. Professional services: Scott Nelson, Mike Ryan, & Becky Kazmierski H.H. Holmes Testing Laboratories Inc. Mike Fischer, SEC Group

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Data & Results

Mix Designs

Note: NCA (Nonchloride acclerator), Poly C (Polycarboxylate superplasticer), and Midrange H20 Reducer dosage is ounces per 100 weight of cement

Laser Scans

3-D Laser Scans:

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Past Articles

• March 2010 Update: "One Year Later"
• September 2009 Update: "Curling and Shrinkage in Floors"
• May 2009 Update: "Warehouse Floor Field Test"
• February 2009 Update: "Researching Warehouse Floors"

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Slideshows

Floor Placement: Take a look at how the warehouse floor was placed for the CC Field Test.

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Videos

Floor Placement
The 60,000-square-foot warehouse floor was placed on Feb. 11, 2009 in Bartlett, Ill. Take a look at these videos* that show knee walls being placed with internal vibration, measurement and testing, floating operations, striking off, and a laser screed.

• CC Field Test—Floor Placement #1: Knee walls being placed and concrete vibrated
• CC Field Test—Floor Placement #2: Concrete measurements being taken
• CC Field Test—Floor Placement #3: Ride-on trowels is the first finishing step
• CC Field Test—Floor Placement #4: Workers striking off
• CC Field Test—Floor Placement #5: Use of a laser screed

* CONCRETE CONSTRUCTION is not responsible and does not condone improper safety procedures.