Concrete Moisture Test Using Plastic Sheet Method

1 1 this test method is used to indicate the presence of capillary moisture in concrete.

Concrete moisture test using plastic sheet method.

Spread out each plastic square flat over a dry area of concrete. After 72 hours a humidity reading is taken under the plastic with a dew point hygrometer. This video discusses and demonstrates the plastic sheet method for measuring moisture in concrete. 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.

Some methods of concrete moisture testing use a simple qualitative approach. The values given in parentheses are mathematical conversions to si units that are provided for information only and are not considered standard. The test shall be conducted prior to the use of coating. Use as many squares as needed to test all the main areas that may get flooring.

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. 1 2 the values stated in inch pound units are to be regarded as standard. It is important to understand why this testing method is unreliable for determining concrete slab moisture problems. Tape along all four edges of the square with duct tape or other waterproof tape.

Firmly press the tape to create a moisture tight seal with the plastic and concrete. Concrete moisture and vapor test methods 1. One such test is the plastic sheet test astm d4263. To use this method astm d 4263 standard test method for indicating moisture in concrete by the plastic sheet method a plastic sheet is tightly taped to the concrete.

So it is suitable for the case where the application of coatings for concrete surface is planned.