Maryland Polished Concrete
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Maryland Polished Concrete
Maryland Polished Concrete
Maryland Polished Concrete
Maryland Polished Concrete
Maryland Polished Concrete
Maryland Polished Concrete
Maryland Polished Concrete

 

 

 

 

 

 

 

 

The Calcium Chloride "Vapor Emission Test" has been developed to quantify the amount of moisture vapor emitting from the surface of a concrete slab. The results are accepted by most flooring, adhesive and resinous coating manufacturers in establishing the benchmark of acceptability for the installation of their products over a concrete surface.

The test is performed by placing a quantity of calcium chloride in an open dish and placing the dish on a clean concrete surface. The dish is covered by a dome of approximately 9" x 9" and 2" in height. This dome is sealed to the concrete to prevent normal humidity in the room from affecting the test. The test kit is left undisturbed for a period of 72 hours. At the end of the test period the dish is retrieved and any weight gain experienced by the dish is attributed to moisture leaving the concrete and being absorbed by the calcium chloride. The test results are calculated to approximate the equivalent number of " pounds" of emission as outlined above.

The environment of the air space in the building is of critical importance during the test series. Vapor pressure differential, created by temperature and humidity, have a controlling influence on moisture vapor movement. Testing should take place in a building conditioned to the same ambient temperature and relative humidity levels as the occupant will require during use of the space.

If these conditions cannot be met, the ASTM standard offers tolerances which, at a minimum, should be honored if accurate test results are anticipated. Testing in a non-acclimated environment leads to erroneous results.


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