Concrete is easily the most resourceful construction material in history, but it presents some unique issues when combined with other materials, especially floor coverings. Concrete moisture is always present to some extent in concrete slabs, whether they are placed in a structure or placed on grade.
Moisture in Concrete:
Sources and Movement
Excess
moisture in concrete slabs must get into the surface and evaporate for drying.
When the concrete hardens, moisture will still go on the pathways for as long
as they remain open. Climatic temperatures and humidity also affect drying
times.
Concrete Moisture
Testing Methods
A
variety of methods are used in detecting and documenting concrete moisture
characteristics. The best tests give a clear idea and accurate answers to
moisture issues. Let’s discuss some of these practices and determine what works
for our application.
●
Plastic
Sheeting: Nothing intricate here; take a square of plastic and duct tape
it to the floor. There are no special techniques required or standardized test
procedures to follow. Suppose you check the next day the moisture under the
plastic. In that case, you will know that moisture might get collected under
the plastic at a specific temperature, at relative humidity, at a certain
barometric pressure, and a good level of sunlight or shade.
●
The calcium
Chloride - Vapor Emission Test is an ASTM F1869 method that helps
measure the amount of water vapor from the concrete in a specific period. An
accurately weighed dish of anhydrous calcium chloride pellets is put under a
sealed plastic cover for 60 to 72 hours. The difference in weight due to
moisture absorbed by the calcium chloride compound helps to estimate the pounds
of moisture vapor discharged.
●
Concrete Moisture Meters supply rapid,
non-destructive results and excel at taking multiple moisture readings over a
large area. When these are held against concrete surfaces, specific contact
pins or plates on the bottom of these meters can read electrical impedance.
● Concrete Relative Humidity Probe Kits based on the ASTM F2170 test method are quite comprehensive tools used today to analyze concrete moisture.
Contact
Omni Controls for Concrete
Moisture Testers Call at Phone: 813.971.5001 Email: sales@omnicontrols.com and speak directly to our tech support
members.
Contact us:
OMNI CONTROLS INC.: https://www.omnicontrols.com/
Commerce Park Professional Center 5309 Technology Dr. Tampa, FL
33647
P: 813.971.5001
Email: sales@omnicontrols.com
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