Carbide Bomb Test 👉Testing your screed moisture content with the Carbide Bomb Test

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Carbide Bomb (CM) Test

The Carbide Bomb test is also known as the CM test. It was designed to measure the moisture content of a wide range of products. However, it is used extensively for screed and concrete. The measurement is the percentage moisture of a given sample before the laying of sensitive floor coverings.

It can be used for all screed and concretes, even fast-drying screeds that act by chemically binding the majority of construction moisture where a relative humidity or electrical impedance device cannot be used.
Typical Target Measurements Are:

• Concrete/sand cement slabs/screeds: • 2.5% CM without underfloor heating installed • 1.5% CM with underfloor heating
• Anhydrite/Hemi-Hydrate screeds: • 0.5% CM without underfloor heating installed • 0.3% CM with underfloor heating installed.

The test is carried as follows:

• The sealed vessel should be thoroughly cleaned before each test is carried out. This will prevent any discrepancies with the results
• The CM test involves removing a sample of the slab/screed and crushing using a mortar and pestle, then weighing the required amount. The sample is then placed into the pressure vessel in a horizontal position.
• Calcium carbide reagent is then added to the vessel. The cap is inserted into the pressure vessel, and the clamp is tightened to seal the cap to the unit.
• The vessel is then turned to a vertical position and is vigorously shaken in a rotating motion for 20 seconds.
• It is then rested for 20 seconds and then continue again for a further 20 seconds, with the process continuing for 3 minutes.
• Calcium Carbide, when in contact with moisture, produces acetylene gas. The higher the moisture concentration, the more gas is produced, which is read as pressure from the devices gauge.

You are in the right place to find out more about Carbide Bomb Test

I will also cover topics on:
Calcium Carbide Test
CM Screed Test
Screed Moisture Test

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