ASTM D , Standard Test. Method for Indicating Moisture in. Concrete by the Plastic Sheet. Method. General Guidance. ASTM E , F ACI R ASTM Dpdf – Download as PDF File .pdf) or read online. 1 Sep This standard is issued under the fixed designation D ; the 1 This test method is under the jurisdiction of ASTM Committee D33 on.

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The ASTM D Concrete Moisture Test A concrete floor slab with excess moisture pretty astm d4263 guarantees a astm d4263 failure due to serious problems such as discoloration, bubbles, curling, adhesive deterioration, cupping, buckling, warping, mildew or mold. However, it is NOT recommended.

And more importantly, expect astm d4263 failures. For a relatively minor investment in testing equipment, contractors and flooring installers can save considerable time and money.

Accurate Concrete Moisture Measurement? It sounds simple enough, right?

Another plus is that the test provides hard numbers expressed as percent RH that make it very easy for deciding when the slab is dry enough for installing the finished floor. The test method involves taping an astm d4263 mm square of polyethylene film onto a astm d4263 slab and waiting at least 16 hours.

No more costly, moisture-related callbacks. What happens next is that the moisture gradient will tend to disappear, bringing some moisture that was deeper down, up toward the surface. An unsealed concrete slab will typically exhibit an appreciable moisture gradient, drier at the surface and wetter below. RH testing is a no brainer because it not only asym scientific sense, it makes economic sense too. Nor does it indicate whether additional moisture is astm d4263 the slab from below, such as in the absence of a vapor astm d4263.

However, the reverse is not true.

A concrete floor slab with excess moisture pretty much guarantees a flooring failure due astm d4263 serious problems such as discoloration, bubbles, curling, adhesive deterioration, cupping, zstm, warping, mildew or mold. Afterward, the underside of the sheet is examined astm d4263 signs of moisture.

Instead, always rely on in situ RH moisture testing. Any moisture condensation or observable darkening of the color of the concrete astm d4263 the sheet suggests excessive moisture and means the slab is not ready for a moisture-sensitive floor covering.

ASTM D4263

For more information about RH testing, click here. Some methods astm d4263 concrete moisture testing use a simple, qualitative approach. Ultimately, this d44263 an appreciably wetter condition at the surface than either the Plastic Sheet Test or any other surface astm d4263 will be likely to show. A positive result with observable moisture underneath the plastic sheet confirms astmm the concrete slab is too wet for a flooring installation. It can no longer evaporate through the surface.

Astm d4263 approach has been scientifically proven to provide a true picture of the overall moisture condition of the slab.

The ASTM D Concrete Moisture Test

Observable moisture on the underside of the plastic sheet depends on the dew point, which in s4263 depends on the astm d4263 temperature of the concrete. No serious flooring failures due to hidden, excessive moisture in the slab.

So unless you take the moisture gradient into account and measure moisture deeper within the slab, expect to be misled by your test astm d4263.

A negative test astm d4263 a dry plastic sheet with no observable moisture underneath does not necessarily confirm that the slab is aztm dry. Yes, it matters a great deal.