Once the slab is sealed, either with a surface coating or a flooring system, the moisture levels gradually become uniform throughout the slab, a process referred to as equilibration.
Thanks for the question. For computation, we will carry out the decimal places as far as they can go:.
The salt absorbs moisture in that environment and presumably coming from the concrete slab and the weight gain after three days is used to calculate the MVER. Toggle navigation. January 8, 2019 at 10: This, by definition, means that a sealed, equilibrated slab will have higher moisture at the surface than it did before it was sealed when testing happened.
This test is directly specified by the vast majority of the Floor Covering Industry as the primary measure of moisture acceptability for floor covering installation.
However, the purpose of running the test between 60 and 72 hours is to get a good sampling of the moisture emission volume as a function of time. February 2, 2019 at 7: Thanks for the comment. Get the white paper explaining the scientific method for testing concrete moisture when you sign up for our newsletter.
Avoiding Slab Moisture Problems 5. The formula for calculation of test results is as follows: Okay, thanks. Recommended Content 1.
Replace the concrete if old and permeable, or wait for it to dry longer if it is a new slab. There is some controversy as to whether or not the dish in contact with the slab has any effect on moisture retardation, and therefore whether or not it should be deducted from the area under the dome.Chemical Tests for Chloride - MeitY OLabs
What has happened to the floor to prompt you to check moisture levels at this point? Ultimately, it comes down to the information that a flooring or concrete specialist needs to have to ensure the longevity of the floor system.