Concrete Webinar - Printable Version
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Concrete Webinar - Ernesto - 05-26-2011 01:31 PM
Great Job on the webinar Ray. Next time make it longer, course I know you could go on for days. And the tape trick was good, I seem to remember that but thanks for clearing the cobwebs. Good basic concrete webinar.
RE: Concrete Webinar - eaadams - 05-27-2011 11:39 AM
I just watched it. My boss is out of the office
If anyone has the .ppt I would love a copy please!
The points I didn't get:
1) Curing Compounds: they don't all degrade. Exp the sodium silicate snake oils. Also, my local WR Meadows rep said a big factor is 'regular construction traffic'. Still, there is no good way to test if it has dissipated across the slab.
2) How do you honor an active crack in an area where you cant go all the way to the top of the floor covering. Like down the middle of a large room >50' wide that is to receive a vinyl floor. Few concrete placements are done in a way that there aren't 'active' joints in a slab like that. I asked our tech director and his answer was "it is impossible".
2a) I'd like a little more info on the compressive strength of low compressive patching / feathering compounds and why they push up more readily. Do they just crush and not push up if they are properly watered and the slab re-equilibrates? (@28min) What products does Ray recommend under the high moisture adhesives out there? (Forbo, Gerflor, Nora all have adhesives that go over 90% rH now)
2c) @ 29:48 - where is that picture from?! I swear it is from one of our jobs. How was that repaired? An epoxy? A polyurethane? A polyurea?
3) Asbestos doesn't breathe? what? I've always been told Asbestos tiles will breath I think I saw an ACI video where Bruce Suprenant discussed this.
4) Trowel Notch - I agree. As far as I am concerned every adhesive pail needs a trowel blade attached to it. When you are done with the pail, toss the blade.
5) I want to see this rh 'puck' - How is it anchored - epoxy? Like in a pull off testers for ACI 503R? I'd like to know how it performs vs CaCl since they measure similar concrete depths.
6) I don't get this tape test for dark adhesive. You are applying the tape to a scraped off adhesive area or to the adhesive?
RE: Concrete Webinar - Ernesto - 05-28-2011 03:32 PM
Numero Uno. I do the water droplet test, thats all I know that works fast. When it doubt.......
2) Crack or construction joint? Did you put a movement gauge over it?
To patch a crack or not patch a crack...age old questions. All cracks move, less after 2-3 years.
3) Asbestos tiles breathe around the edges, all tiles do.
4) Still does not mean they will use them. lol
5) Why not just a meter if the lightweight is only 2 inches thick?
6) I think Ray means tape over the adhesive as soon as you pull up the product, then if it turns brown it has not set...it is drying out.
Thats the extent of my knowledge.
RE: Concrete Webinar - CC Solutions - 05-30-2011 11:34 AM
For cracks I polyurea them. Or you can epoxy them, but I think filling any crack with patch is dangerous. If the concrete moves the patch blows.
For a meandering crack, I have epoxied them tight then re-cut a movement joint in a nice straight line that the flooring installer can honor through the flooring. Just an idea....
RE: Concrete Webinar - Ernesto - 06-01-2011 08:16 PM
I have used the poly foam for some cracks as well. Just off the shelf stuff. I see Koester has some nice stuff, wonder if I can get those tubes here.
Also the dewpoint chart on Koester is awesome and is even color coordinated.
RE: Concrete Webinar - rthompson - 06-07-2011 10:53 AM
The tape trick is: as soon as the adhesive is exposed place a piece of tape over the exposed adhesive and allow the exposed adhesive to air dry for aboout 1/2 hour. If there is a drying effect the adhesive will darken in the exposed area and remain lighter in the unexposed area.
Asbestos is permeable, but it is dimensionally stable and will not decay.
To check cracks, put some Plaster-of-paris over the crack and leave for a week, then examine closely for fine cracks.
The curing compounds do degrade either by UV degradation or oxidation. But it is difficult to get out of the pores, especially if it has been applied too heavy. Cure'n'Seal is a different beast.
The RH "puck is available from Maxxon Corp. It is attached with screws.
I have a day long seminar on Moisture in concrete and testing.
RE: Concrete Webinar - rthompson - 06-12-2011 10:56 AM
We are currently working on a Webinar on substrates other than concrete, IE wood, gypsum concrete metal , etc.
Any topics would be appreciated.
This is scheduled for this fall.
RE: Concrete Webinar - Ernesto - 06-12-2011 04:49 PM
(06-07-2011 10:53 AM)rthompson Wrote: Asbestos is permeable, but it is dimensionally stable and will not decay.
How about asbestos/w cutbac adhesive. I think that helps stop emissions. When I see it I immediately think, floating floor!
RE: Concrete Webinar - eaadams - 06-20-2011 12:31 PM
The cutback doesn't stop emissions. It allows for a higher pH and the tiles are permeable so there is an exit path for moisture pressure.
RE: Concrete Webinar - Ernesto - 06-22-2011 07:57 PM
Never said it stops, but does inhibit emissions somewhat. But no matter who says what about their product sticking to it....sure it may for a year or two. I don't trust any flooring skimcoat to stick to it forevah.