Acceptable Relative Humidity In Concrete Slabs

Because rh probes are less sensitive to short term fluctuations in ambient air humidity and temperature above the slab they are one of the most accurate measures of concrete moisture.

Acceptable relative humidity in concrete slabs.

The in situ probes are the. According to astm f2170 when drying concrete slabs have lower moisture levels near the surface and higher levels towards the bottom of the slab. Sources of moisture in concrete. When measuring moisture in concrete the best and most reliable method is to use the astm f 2170 testing method.

The best method for testing relative humidity is one that employs rh probes at various locations across the concrete slab. To ensure all. Tips for following the best way to measure moisture deep in concrete slabs. 6 2 hole liners plastic or non corroding metal tubes inside diameter not more than 0 04 in.

Acceptable moisture levels in concrete according to astm standard when testing via astm f2170 the rh level of a concrete slab needs to be at or below 75 unless the flooring system manufacturer provides alternate guidelines. Read more about relative humidity testing in concrete slabs. Under this method you ll use a thermo hygrometer with in situ probes along with a series of prepared holes to get readings of relative humidity deep in. Checking with salt solutions is an acceptable method of assessing probe performance.

Are a special kind of moisture testing device that can be used to monitor temperature and relative humidity conditions in a given area. If the slab is not given sufficient time to dry to acceptable levels any of a number of problems can occur. Astm f2170 standards require readings to be taken at a depth of 20 or 40 depending on the number of exposed sides. Multiple factors can influence the level of relative humidity in a concrete slab thus contributing to high relative humidity 6 months or more after pouring concrete.

It also dictates the number of probes and various other factors which may be influenced by site conditions to achieve an accurate reading. Astm f2170 standard test method for determining relative humidity in concrete floor slabs using in situ probes states that. 1 mm greater than the probe s. What most professionals do to monitor moisture conditions in a concrete slab is the relative humidity rh.

Concrete slabs often have thicknesses measured in feet not inches. Some flooring system manufacturers have products that can handle 95 rh or mor 2. What is the best method for testing relative humidity in concrete. The initial amount of water in the concrete from a high water cement ratio.