+- Concrete Moisture Measurement Forums (http://www.wagnermeters.com/concreteforum)
+-- Forum: Concrete (/forumdisplay.php?fid=1)
+--- Forum: General Discussions (/forumdisplay.php?fid=6)
+--- Thread: Schmidt hammer (/showthread.php?tid=216)
Schmidt hammer - eaadams - 10-26-2011 09:46 PM
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.
RE: Schmidt hammer - CC Solutions - 10-28-2011 11:41 AM
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.
RE: Schmidt hammer - eaadams - 11-02-2011 10:24 PM
(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
RE: Schmidt hammer - CC Solutions - 11-03-2011 06:56 AM
Not exactly..
The one he used looked more like this: