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Wagner Rapid Rh Placement with CaCl Combo Test over MVP4 and 6 Mil
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Permalink Reply by Bob Higgins on -
When using any form of humidity reading, the amount of moisture cannot be predicted in any substance that contains sorptive and/or semi-sorptive materials, such as concrete.
1. what is the exact porosity of concrete? If unknown, the volume of any measured humidity, is also unknown.
2. What is the content of sorptive/semi-sorptive materials? These materials serve to "steal" measurable moisture from the pores of the concrete, and in fact, moisture volume where these materials exist, may be higher with a lower humidity reading.
3. What are the temperature fluctuations within several days? Humidity "levels" will rise and fall with temperature, even when the volume of water is constant.
4. Temperatures also effect the cohesive properties of water. Once condensed, water as a liquid, may no longer be measurable with a humidity probe.
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Permalink Reply by Stephen on -
Bob! I love ya buddy. Thanks for chiming in.
Yea, I know nothing about all those admixtures! I'm on another one right now. The house is way up in the foothills, Like as high as you can go. People spend several hundred thosuad dollars just getting the pad ready...chipping through rock for months. Anyway, this house has several levels. At the bottom near the pool you can see where actual water was running out of the rock since the last rain/snowfall. It's warming up and the water is moving.
I placed three Rapid rh probes in this one room, 22x26. Two were at the back of the room where the house is up against the mountain, and the slab is three feet below grade there. I was not surprised when the rapid rh tests in the back were hitting in the low 90"s and the one in the middle was 88rh.
However two days later I checked them and the ones in the back were 67 & 68rh @ a steady 67 degrees, respectively and the one in the middle was 85rh. Now thats a shocker. I was expecting it to hold.
I put down MVP4 today and when I go back to lay the 6mil plastic over it I will check them again. Then after the plastic is down I'll throw down a couple CaCl testes to see what I get. This should be interesting since it is in an extreme situation..Even the flagstone steps going down to the pool are still wet from the last rain. That was on New Years day.
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Permalink Reply by Stephen on
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Check out test area #3. I did a cacl test and a Rapid Rh test. Cacl test on top of 6 mil plastic hit 0.6lbs after 70 hours. And the rh test is running 55. Yes thats MVP4 on that slab
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Permalink Reply by Stephen on
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Test area#1 was surrounded by the 6 mil plastic over MVP4 and had very simlilar results as test area #2 emission wise, however the Rh has been higher there in the center of the room since day one and stayed that way.
The effect of the MVP4 on the Rapid Rh tests numbers went up by several degrees after the MVP4 was placed four days later. They were initially hitting in the high 40's and mif 50's in the center of the room.No where's my lens cleaner. ha ha
Just for giggles I shot this meter test at the step
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Permalink Reply by Stephen on
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FYI on the CaCl test results were low 1's over the MVP4, even the one in the center surrounded by plastic. And the CaCl test over the plastic and MVP4 was a 0.5lbs. I like that!
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