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Allen Face has been writing articles for the industries informational resource Concrete Construction since 1982. Please visit their website to browse through his articles as well as a trove of other useful information.

For your convenience, we have provided a summary and links to several of his articles here for you as well.

 

A Pop Quiz

Published April 8, 2010

Updates
The first six installments in this series dealt with contracting issues. Now we change gears to focus on the physics of the slab on grade. For starters, the following true or false quiz should give you a fair sense of your current technical level. The context is slabs on grade, and there are no tricks. Take your time and use references if you like.

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As Simple as 1-2-3

Published June 11, 2010

Updates
A level shovel of cement, two full shovels of sand, three full shovels of stone, enough water to make it workable, and voilà—the magic stuff around which the concrete profession revolves. My granddaddy's 1-2-3 concrete formula—passed on to me around age 12—was my introduction to the high-tech world of concrete. Fifty years later, most slab-on-grade projects feature some variation of this mix.

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Grinding and F-Numbers

Published June 11, 2010

Updates
QUESTION: Our business has become more focused on polishing concrete retails floors, and we are concerned how grinding and polishing affects a floor's flatness and levelness. How can we be sure we are meeting the correct specifications? Do any studies exist showing the effects on FF and FL numbers?

ANSWER: Grinding and concrete floor tolerances go hand-in-hand. More than 30 years ago, using gasoline-powered, single 10-inch diamond disc grinders, my father and I started spot grinding the wheel tracks of narrow-aisle lift trucks to improve their dynamics.

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Self-Delusion

Published July 1, 2010

Updates
The dozen biggest recurring slab-on-grade problems—both real and imagined—involve: cosmetics, cracking, curling, delamination, dowel alignment, profile tolerances, joint filling, joint stability, joint spalling, sweating, thickness, vapor transmission, and WWF location. Both owners and designers, of course, presume the science embodied in the established design and specification procedures is capable of avoiding all these troubles. Indeed, so the thinking goes, if the contractors would just follow the plans and specs then everything would be fine.

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Curl Numbers

Published Aug 5, 2010

Updates
Rule No. 8a asserts the futility of using the compressive strength and slump tests to control the quality of a slab on grade. Because these two concrete characteristics are irrelevant to a slab's performance, their management can provide little if any benefit.

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Allen Face & Company

830 A Roundabout Ct
West Dundee, IL 60118
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