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03-25-2011, 05:04 AM #11
jnasvik Newbie *
Status: Offline Posts:1 Threads:0 Joined:Mar 2011
A couple clarifications. The field study went for 2 years and the concrete was finished in a manner common to big box floors these days. What's never really been considered is the impact of heavy ride-on trowels on surface finishes. On this floor the densified finish was approximately 1/8 inch thick. The water was pressed out, mostly downward, leaving much of the cement unhydrated. In that state portland cement becomes a very hard abrasive resistant aggregate. Also, there was no pore structure to speak of, making the top 1/8 inch very impermeable. My guess is that a light bead blast wouldn't do much to make the surface more permeable unless you went through most of the densified layer.

The inside conditions are typical of many or most warehouses. The owner heated the building to about 50F in the winter and there was no heat or air conditioning in the summer. So ambient conditions in the winter were about 40% RH and 50F and in the summer they were up to 80% RH and in the 75F range.

We just published the last article about the study and you can view that, along with all the other articles written about it at http://www.concreteconstruction.net/field-test.aspx

Best Wishes
Joe Nasvik
Sr. Editor, Concrete Construction magazine

03-25-2011, 08:28 PM #12
eaadams Concrete Moisture Expert *****
Status: Offline Posts:600 Threads:88 Joined:Jul 2010
Hey everyone, caught the tweet, Mr. Nasvik's blog is looking for our experiences with moisture.....


04-01-2011, 07:58 AM #13
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,067 Threads:69 Joined:Dec 2009
The warehouse investigation is very interesting, and it points out that each concrete slab is unique. There is no chart anyone can follow to tell when a slab will be dry, how hard it will get, where it will crack..... Big Grin

JD Grafton
Concrete Answers for Flooring Problems

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