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Schmidt hammer
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10-26-2011, 09:46 PM #1
eaadams Concrete Moisture Expert *****
Status: Offline Posts:587 Threads:83 Joined:Jul 2010
Anyone ever use a Schmidt hammer? How? Can they be used on 365+ day old concrete?

I'm considering investing in one but don't know how they work.

I'm starting to think a lot of my headaches are from either
a) soft crete - concrete that has a surface problem that falls apart after I have the floor down
b) hard crete - hard troweled concrete that inhibits a normal speed of moisture movement out of the slab.

10-28-2011, 11:41 AM #2
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
Oh yeah, the rebound hammer! It is designed to tell you the compressive strength of the concrete. They are good to get a number, but I was pretty disappointed to see Mr. Craig didn't use one on a project we did...

He just scraped the concrete surface with a screwdriver. If you can scratch the surface semi-easily, something is wrong.

If the slab doesn't completely absorb a drop of water in one minute, it's not porous enough.

Those are the tests I use 100% of the time. If I need to document something I will use a rebound hammer and an elcometer to get further numbers.

JD Grafton
Concrete Answers for Flooring Problems
JGrafton@ccsolves.com

11-02-2011, 10:24 PM #3
eaadams Concrete Moisture Expert *****
Status: Offline Posts:587 Threads:83 Joined:Jul 2010
(10-28-2011, 11:41 AM)CC Solutions Wrote:  He just scraped the concrete surface with a screwdriver. If you can scratch the surface semi-easily, something is wrong.

Is this what he used? http://www.mineralab.com/Hardness.htm

11-03-2011, 06:56 AM #4
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
Not exactly..

The one he used looked more like this:


Attached Files
.jpg screwdriver.jpg Size: 9.69 KB  Downloads: 6

JD Grafton
Concrete Answers for Flooring Problems
JGrafton@ccsolves.com








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