Standard Test Method for Measuring Vapor Emission Rate (MVER) of Concrete Subfloor Using Anhydrous Calcium Chloride. Apparatus – the kit plus a gram. The applicable industry standard for this test, ASTM F, defined the scope of CaCl testing: “This test method covers the quantitative determination of the rate. Measuring Moisture Vapor Emission Rate of Concrete Subfloor Using Anhydrous Calcium Carbide.
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Concrete moisture vapor migrates from the bottom of concrete slabs to their surfaces in order to evaporate. The values d1869 in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Generally, high ambient RH slows concrete drying as the slab absorbs moisture vapor; low ambient RH causes concrete to emit moisture vapor.
The CaCl moisture test is a building practice with lineage. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
All floor coverings are susceptible to failure astk excessive moisture vapor emissions.
The calcium chloride moisture test has been the industry standard for making this determination and is adtm practical, well-established and accepted test of dynamic moisture. Although builders continue to use the CaCl moisture test, post-installation moisture problems eventually redefined it as a test method worthy of scrutiny.
Builders, then, made threshold floor covering decisions based on errant readings. This is how concrete dries.
The Workman’s History of Calcium Chloride Testing (F) – ASTM F Information
Where the challenge became clear was in determining whether the surface emission rate determined by desiccant weight gain truly reflected the moisture conditions deeper in the slab.
Learn how your comment data is processed. Work Item s – proposed revisions of this standard. Concrete floor installers began using the calcium chloride CaCl moisture test back in the early s to conclude when a new concrete slab was fit for floor coverings.
CaCl tended to underestimate the true moisture conditions at the high end of the moisture spectrum, while it tended to overestimate the moisture conditions of older slabs. Concrete moisture emission is a natural process driven by environmental conditions. Historical Version s – view previous versions of standard.
The results obtained reflect the condition of the concrete floor surface at the time of testing and may not indicate future conditions.
This measurement is astk equivalent weight of water evaporating from ft 2 of concrete surface in a 24—h period. Over decades, CaCl gained industry acceptance as a practical standard. The moisture vapor emission rate only reflects the condition of the concrete floor at the time of the test.
In light of such research, the American Society for Testing and Materials made two changes to moisture measurement industry standards. It is the responsibility of the user of this standard to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
CaCl measured only the top one-half to three-quarters inch of the slab. This led to continued moisture problems when that moisture eventually reached a covered concrete surface where they could no longer evaporate.
It will produce quantified results directly applicable to flooring manufacturer’s specifications.
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All concrete subfloors emit some amount of moisture in vapor form. But their truth has entered a new era and the challenges of moisture r1869 testing are becoming f189 clear. Your email address will not be published. Therefore, the natural migration process of concrete moisture drying is influenced by environment.
Submit a Comment Cancel reply Your email address will not be published. At that point, it was safe to install floor covering over a concrete substrate. The moisture vapor emitted from a concrete slab is measured in pounds.
Link to Active This link will always route to the current Active version of the standard. In fact, moisture-plagued concrete slabs certified by ASTM F protocol proved to be a patterned and persistent challenge to the concrete flooring industry — so much so that industry professionals began to investigate the scientific integrity of the CaCl moisture test. The CaCl moisture test produced data based on moisture vapor emission rate MVERthe quantitative indication of how many pounds of slab moisture evaporated from square feet of concrete over a hour period.
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