The PosiTector CMM IS In Situ Concrete Moisture Meter is the simple, durable and accurate way to measure concrete relative humidity in accordance with ASTM F2170. In-situ probes can be calibrated with traceability to national standards.ĭeFelsko's Solution for Measuring Concrete RH.In-situ tests tend to provide a significant saving in testing time and labor versus calcium chloride tests.In-situ probes directly measure the actual moisture conditions within the concrete, regardless of mix, aggregate types, floor slab thickness, or surface conditions.The in situ RH test has a number of advantages over other methods: It involves drilling a hole into the concrete and using an electronic relative humidity probe to directly measure the moisture in the slab. The new industry standard for measuring concrete RH is the in situ concrete relative humidity test as described in the ASTM F2170 standard test method. Watch this video to learn more about non-destructive concrete moisture meters. ASTM recommends that this type of concrete moisture meter be used as a comparator, or a companion to in-situ RH probes, and not for determining quantitative moisture content. Variations in the concrete composition and the presence of reinforcing materials like rebar can cause erroneous readings.
But, owing to their design, these meters can be affected by other slab conditions. Offering near-instantaneous measurement of the top ¾” of a slab. Non-destructive electronic concrete moisture meters, such as the PosiTest CMM, measure the electrical impedance of concrete-which is related to concrete moisture. Non-destructive Electronic Concrete Moisture Meters They are heavily influenced by ambient conditions.They measure moisture only on the surface of the concrete.There is no practical way to calibrate these kits with traceability to national standards.However, significant doubts concerning the accuracy of this test have arisen: The anhydrous calcium chloride test involves measuring the increase in weight of salt as it collects moisture from an encapsulated area on the concrete surface.
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