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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All floor coverings are susceptible to failure from excessive moisture vapor emissions. 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. Over decades, CaCl gained industry acceptance as a practical standard. The calcium chloride moisture test has been the industry standard for making this determination and is a practical, well-established and accepted test of dynamic moisture.
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. Link to Active This link will always route to the current Active version of the standard.
This led to continued moisture problems when that moisture eventually reached a covered f8169 surface where they could no longer evaporate. Submit a Comment Cancel reply Your email address will not be published.
Concrete moisture emission is a natural process driven by environmental conditions. Therefore, the natural migration process of adtm moisture drying is influenced by environment. The moisture vapor emitted from a concrete slab is measured in pounds.
At that point, it was safe to install floor covering over a concrete sstm. Concrete floor installers began using the calcium chloride CaCl moisture test back in the early s to conclude ast, a new concrete slab was fit for floor coverings. Concrete moisture vapor migrates from the bottom of concrete slabs to their surfaces in order to evaporate.
Builders, then, made threshold floor covering decisions based on errant readings. The CaCl moisture test is a building practice with lineage. 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.
satm It will produce quantified results directly applicable to flooring manufacturer’s specifications. Although builders continue to use the CaCl moisture test, post-installation moisture problems eventually redefined it as a test f169 worthy of scrutiny. Learn how your comment data is processed. This measurement is the equivalent weight of water evaporating from ft 2 of concrete surface in a 24—h period. All concrete subfloors emit some amount of moisture in vapor form.
CaCl measured only the top one-half to three-quarters inch of the slab.
ASTM F 1869 Standard Test Method Using Anhydrous Calcium Chloride
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. But their truth has entered a new era and the challenges of moisture emissions-based testing are becoming increasingly clear.
In light of such research, the American Society for Testing and Materials made two changes to moisture measurement industry standards. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
The Workman’s History of Calcium Chloride Testing (F) – ASTM F Information
The moisture vapor emission rate only reflects the condition of the concrete floor at the time of the test. Generally, high ambient RH slows concrete drying as the slab absorbs moisture vapor; low ambient RH causes concrete to emit moisture vapor.
R1869 Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Work Item s – proposed revisions of this standard. 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.
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Your email address will not be published. Historical Version s – view previous versions of standard. This is how concrete dries.
This site uses Akismet to reduce spam. The results obtained reflect the condition of the concrete floor surface at the time of testing and may not indicate future conditions.