Standard Test Method for Determining Relative Humidity in Concrete Floor Using in situ Probes. Apparatus – Humidity Probe and Digital Meter Accuracy ± %. ASTM F ASTM F RH (Relative Humidity). Testing Protocol: ASTM Abstract: Significance and Use. Moisture permeating from concrete floor slabs. 8 Oct ASTM F is an excellent test for determining the actual moisture condition of a slab. As a result, this type of test is recommended by many.
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Have you heard about the change in ASTM F2170 from 72hrs to 24hrs?
In-situ concrete moisture testing places sensors, or probes, inside the slab itself. And moisture can still be an issue at grade so concrete foundations must be designed to include proper moisture drainage.
The In-Situ Method In-situ probes deepen concrete moisture aatm.
I would verify that the hole depths are consistent and that environmental conditions are at service conditions. Thanks for the reply, Patrick.
Have you heard about the change in ASTM F from 72hrs to 24hrs?
When standards are revised, it is a good time to f210 sure we are up to date and following the procedure to best practice. If i have an area of approx sq ft and have done the required testing for the area, and 5 fail and 3 pass does the whole area fail? After the initial reading, readings can be updated at any time desired with two conditions in mind: As a result, this type of test is recommended by many international standards including ASTM, British Standards, and most Scandinavian standards, as well as being specified by floor covering, coating and adhesive manufacturers worldwide.
And installers are finding results are more accurate and more dependable with RH testing.
When concrete is mixed and poured, water vapor migrates from the bottom of the slab to the surface to evaporate. At this point, if one test fails, they all fail. The first thing I would look at is the assembly that you are installing.
That being said, I have heard a couple of different methods people are using. October 31, at Be sure to familiarize yourself with ASTM F and choose the best concrete moisture test method for the job. Some calibration restrictions may apply, so read the standard carefully to be sure your test equipment qualifies for the most recent standard.
The only thing we recommend is that you ensure that there is a good seal between the sensor body and the concrete wall.
We have people who use the Rapid RH on shallow pours. Note that the liner requirements have been updated and the hole is to be fully lined to meet the ASTM standard.
Added 08 Oct Author: It has been believed that the change in the desiccant weight could be translated into a moisture ratio for the concrete beneath. The total area of the slab and the number of test holes must be recorded on your report.
Customer Service Contact Us Returns. How do you handle this problem? It is essential that anyone doing the F test follows the standard and allows for that 24 hours to pass before inserting the probe and making final relative humidity measurements. ASTM F is an excellent test for determining the actual moisture condition of a slab. April 3, at Section 9 of the standard requires that both the slab and the ambient air above it must be at service conditions for a minimum of 48 hours before testing.
This process requires time and quantifiable concrete moisture measurements to verify. Is this acceptable or compromise the test? Do you really know your F? Leave a Reply Cancel reply Your email address will not be published. This will NOT be valid for ASTM compliance, but can certainly provide a target timeline for schedule decisions or for choosing alternate adhesive or flooring options that might have higher moisture tolerances.
The standard provides precise guidelines for RH testing methods. June 8, at 1: The MVER is defined as the rate of water vapor emissions from the surface of concrete and is determined with the use of a desiccant material sealed to the slab surface for a specified time period, then measured.
ASTM F formally recognizes the use of in situ probes as a means of conducting relative humidity testing. Concrete slab moisture is a major cause of concrete flooring failure.
First, I have to state that F is specified for interior applications that are under consistent ambient air controls. This is a welcome development as accurate results can be attained in a shorter time.
10 Guidelines for ASTM F2170 Preparation and Testing
The new probes are designed to give a good indication of high relative humidity after an astn of testing. In-situ probes deepen concrete moisture measurement.
General contractors must bear in mind two interactive processes when they are looking at construction schedules: Logically then, moisture levels at the bottom of a slab will read higher from those at the surface.
RH Testing and Reporting Drill and prepare the test holes. Does the finish roof product have specifications for testing the concrete deck? Learn how your comment data is processed. Your email address will not be published. Many contractors use vapor barriers directly under the slab to slow moisture permeation. Without it, even aastm well-dried and functioning foundation can end up with concrete slab moisture problems.