There are two main standards in the industry right now calcium chloride cacl testing and rh testing.
Measuring moisture in concrete.
There are three standard methods for measuring concrete moisture.
Concrete slabs appear to be solid and hard but in reality concrete is moist stuff.
Concrete is manufactured by mixing cement aggregates such as sand and gravel and water.
In this test an 18 inch x 18 inch 450 measuring and removing moisture in concrete by don j.
Schnell munters corporation moisture control services 52 march 1998 jpcl pmc w before you coat concrete you need to know how much moisture it contains and how to.
Also known but less common in use are the hood method plastic sheet method and concrete moisture meters.
That if moisture is detected the concrete is probably not ready for coating.
Inaccurate measuring of aggregate moisture increases production costs.
Given the realities of moisture in concrete and the necessity of measuring the moisture condition of the concrete slab accurately only one clear conclusion exists.
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.
Astm f2170 in situ rh testing will give you the most reliable information to help you manage your flooring project successfully.
Often more than one method is used to get an accurate reading of actual moisture content.
What are the options.
This makes the rh test much faster than any other industry accepted method of measuring moisture in concrete slabs.
The biggest problem in connection with the concrete production is the variation in aggregate moisture and therefore it is an important task to make sure that measuring of the aggregate moisture is easy and as accurate as possible.
How concrete hardens and dries.
This requires accurate concrete moisture measurement.
Testing rh deep in the slab is crucial for determining.
It begins as a liquid slurry of water sand cement and aggregate and even after it hardens moisture continues to pass out of the concrete for years.
Using a meter that conforms to astm f2170 using in situ probes that go inside the concrete make it much easier to be accurate in measuring the moisture of the concrete at its core.
The water creates a chemical reaction in the cement causing it.
When measuring moisture in concrete the best and most reliable method is to use the astm f 2170 testing method.
Now testers need only wait 24 hours.
