Methods For Measuring Moisture Content In Concrete

Painting over concrete that contains too much moisture can result in. For measuring the moisture content of concrete various methods beside the gravimetric method are available which differ from one another with respect to their suitability and reliability. Spread out each plastic square flat over a dry area of concrete.

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Download citation measuring moisture in concrete concrete must be dry and without moisture movement in order to be coated.

Methods for measuring moisture content in concrete.

One of the evaluation criteria is moisture content. Firmly press the tape to create a moisture tight seal with the plastic and concrete. The plastic sheet method was developed by astm international and involves taping a plastic sheet to the surface of the concrete to create a vapor proof seal around the plastic. 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 the concrete slab.

A number of test holes are drilled and rh probes are used to measure the evaporation of the concrete in the isolated space at the bottom of the hole. When measuring moisture in concrete the best and most reliable method is to use the astm f 2170 testing method. The sheet is left in place for 72 hours then a dewpoint hygrometer is used to test the level of moisture that is in the air under the sheet. Below are some testing methods to measure the moisture value for concrete or cementitious screed floors.

Use as many squares as needed to test all the main areas that may get flooring. A typical sample is taken from the bottom layer of the screed or concrete and crushed. The astm standard f2170 describes the in situ rh method for measuring moisture in concrete. Tape along all four edges of the square with duct tape or other waterproof tape.

The calcium carbide method uses the reactivity of calcium carbide with water.