For this test, a calcium chloride disk is placed under a sealed plastic sheet and left to collect moisture vapor. After 24 hours, the disk is retrieved and weighed, and compared to the disk’s pretest weight. This weight difference indicates how much moisture vapor has emerged from the slab in 24 hours.
How to Test Moisture in Concrete?
Testing moisture in concrete is an important part of the construction process. Moisture in concrete can cause a variety of problems, such as cracking, shrinkage, and mold growth. It is therefore important to test the moisture content of concrete before and during the construction process. There are several methods for testing moisture in concrete, including using a moisture meter, using a calcium chloride test, and using a relative humidity test.
Using a Moisture Meter
Moisture meters are the most common method for testing the moisture content in concrete. A moisture meter works by sending an electrical current through the concrete. The current reacts to the moisture in the concrete, and the meter will indicate the moisture content, typically as a percentage. This method is simple and accurate and is ideal for use as part of a quality control process.
Using a Calcium Chloride Test
The calcium chloride test is a popular choice for testing moisture in concrete. This test involves placing a small amount of calcium chloride powder on the surface of the concrete. The powder should be left in place for 24 hours. After 24 hours, the powder will have absorbed the moisture in the concrete. The amount of moisture absorbed by the powder can then be measured and is used to determine the