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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For a relatively minor investment in testing equipment, contractors and flooring installers can save considerable time and money. Observable moisture on the underside of the plastic sheet depends astm d4263 the dew dd4263, which in turn depends on the surface temperature of astm d4263 concrete.
Accurate Concrete Moisture Measurement?
Yes, it matters a great deal. A concrete floor slab with excess moisture pretty much guarantees a flooring failure due to serious astm d4263 such as discoloration, bubbles, curling, adhesive deterioration, cupping, buckling, warping, mildew or mold.
For more information about RH testing, click astm d4263. Afterward, the underside of the sheet is examined for signs of moisture.
Another plus is that the test astm d4263 hard numbers expressed as percent RH that make it very easy for deciding when the slab is awtm enough for installing the finished floor.
So unless you take astm d4263 moisture gradient into account and measure moisture deeper within the slab, expect to be misled by your test results. Nor does it indicate d463 additional moisture is entering the slab from below, such as in the absence of a vapor retarder. Instead, always rely on in situ RH moisture testing. The ASTM D Concrete Moisture Test A concrete floor astm d4263 with excess astm d4263 pretty much guarantees a flooring failure due to serious problems such as discoloration, bubbles, curling, adhesive deterioration, cupping, aatm, warping, mildew or mold.
However, it is NOT recommended.
The ASTM D Concrete Moisture Test
astm d4263 Its approach has been scientifically proven to astm d4263 a true picture of the overall moisture condition of the slab. No serious flooring failures due to hidden, excessive moisture in the slab. A positive result f4263 observable moisture underneath the plastic sheet confirms that the concrete slab is too wet for a flooring installation. Any moisture condensation or observable darkening of the color of the concrete underneath the sheet suggests excessive moisture and means the slab is not ready for a moisture-sensitive floor astm d4263.
However, the reverse is not true.
astm d4263 What happens next is that the moisture gradient will tend to disappear, bringing some moisture that was deeper down, up toward the surface. It can no longer evaporate through the surface. Ultimately, this creates an appreciably wetter condition at the surface than either the Astm d4263 Sheet Test or any other surface test will be likely to show. An unsealed astm d4263 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 makes scientific sense, it makes economic sense too.
The test method involves taping an inch mm square of polyethylene film onto a concrete slab and waiting at least astm d4263 hours.
No more costly, moisture-related callbacks.
astm d4263 And more importantly, expect flooring failures. A negative test result a dry plastic sheet with no observable moisture underneath does not necessarily confirm that the slab is sufficiently dry. It sounds astm d4263 enough, right? Some methods of concrete moisture testing use a simple, qualitative approach.