Concrete moisture meters

Concrete moisture meters

Moisture meters have been used for decades to measure different types of moisture content in different materials and substances. Concrete meters have evolved from the successful wood moisture meter as flooring contractors tried to use their wood meters to measure the moisture in concrete.

Concrete moisture meters are designed to detect moisture to a depth of 1” of a concrete slab in order to avoid the rebar reinforcement below the surface. [Why are We Still Having Problems with Moisture? http://www.concreteconstruction.net/industry-news.asp?sectionID=718&articleID=616752 ASTM F 2170] They are designed to be used as a relative test. The meters are used to “‘Spot check’ the top surface at one particular location on the slab.” ["Concrete Moisture Meters and Calcium Chloride Tests: There Are Better Ways to Test Concrete for Moisture FCI" http://www.fcimag.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_10000000000000187293 ] The results can determine where the best place to put a concrete relative humidity test.

To determine if an area has high surface moisture, a known dry area should be first tested and then compared to a reading from the area in question.

Why concrete moisture meter should not be used as a final reading.

There is no ASTM standard for using a concrete moisture meter to determine a final moisture content reading.

Concrete moisture meters, either non-pin or pin meters are affected by what it sees in the concrete. This can be anything from the density of the concrete and aggregate size to the chemical properties in the slab. [Accurate Relative Humidity Testing Vs. Testing With ‘Moisture’ Meters: KNOW THE FACTS http://www.wwwagner.com/news.php?a=detail&id=33 ]

Uncovered concrete dries from the top down. Concrete moisture meters measure only the top inch at most and this area is drier than the concrete further down. Once a floor covering has been installed the moisture in the slab equilibrates. [How Confident Are You In Moisture Testing? http://www.ntlfloortrends.com/Articles/Column/BNP_GUID_9-5-2006_A_10000000000000217849] In order to ensure the equilibrated moisture will be a safe level for a floor covering, a relative humidity sensor must be drilled and placed at 40% of the depth of the slab. [ASTM F 2170, ”Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes,” ASTM International.] This depth has been proven to be the relative humidity percentage that the slab will equilibrate once the top has been covered by a floor covering.

References


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