Concrete moisture meter

Concrete moisture meter

A concrete moisture meter is a type of moisture meter used by installers of flooring to measure the moisture levels of concrete. These meters have been used for decades to measure the moisture content in different materials and substances. Concrete meters have evolved from the successful wood moisture meter as flooring contractors tried to use their wood meters to measure the moisture in concrete.

Concrete moisture meters are designed to detect moisture to a depth of 1” of a concrete slab in order to avoid the rebar reinforcement below the surface.[1] They are designed to be used as a relative test. The meters are used to “‘Spot check’ the top surface at one particular location on the slab.” [2] The results can determine the best place to put a concrete relative humidity test.

Limitations

There is no ASTM standard for using a concrete moisture meter to determine a final moisture content reading.

Concrete moisture meters, either non-pin or pin meters are affected by what it sees in the concrete. This can be anything from the density of the concrete and aggregate size to the chemical properties of the slab.[3]

Uncovered concrete dries from the top down. Concrete moisture meters measure only the top inch at most and this area is drier than the concrete further down. Once a floor covering has been installed the moisture in the slab equilibrates.[4] In order to ensure the equilibrated moisture will be a safe level for a floor covering, a relative humidity sensor must be drilled and placed at 40% of the depth of the slab.[5] This depth has been proven to be the relative humidity percentage that the slab will equilibrate once the top has been covered by a floor covering.

References

  1. ^ Why are We Still Having Problems with Moisture? ASTM F 2170
  2. ^ Concrete Moisture Meters and Calcium Chloride Tests: There Are Better Ways to Test Concrete for Moisture FCI
  3. ^ Accurate Relative Humidity Testing Vs. Testing With ‘Moisture’ Meters: Know the facts
  4. ^ How Confident Are You In Moisture Testing?
  5. ^ ASTM F 2170, ”Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes,” ASTM International.

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Concrete moisture meters — Moisture meters have been used for decades to measure different types of moisture content in different materials and substances. Concrete meters have evolved from the successful wood moisture meter as flooring contractors tried to use their wood… …   Wikipedia

  • Moisture meter — Moisture meters are used to measure the percentage of water in a given substance. This information can be used to determine if the material is ready for use, unexpectedly wet or dry, or otherwise in need of further inspection. Wood and paper… …   Wikipedia

  • Concrete — This article is about the construction material. For other uses, see Concrete (disambiguation). Outer view of the Roman Pantheon, still the largest unreinforced solid concrete dome.[1] …   Wikipedia

  • Concrete cover — Concrete cover, in reinforced concrete, is the least distance between the surface of embedded reinforcement and the outer surface of the concrete (ACI 130). The concrete cover depth can be measured with a cover meter. Contents 1 Purpose of… …   Wikipedia

  • Reinforced concrete — is concrete in which reinforcement bars ( rebars ), reinforcement grids, plates or fibers have been incorporated to strengthen the concrete in tension. It was invented by French gardener Joseph Monier in 1849 and patented in 1867.[1] The term… …   Wikipedia

  • Cover meter — A cover meter is an instrument to locate rebars and measure the exact concrete cover. Rebar detectors are less sophisticated devices that can only locate metallic objects below the surface. Due to the cost effective design, the pulse induction… …   Wikipedia

  • Flooring — An example of a flooring job. Levelling of ceramic tiles floor with a laser dev …   Wikipedia

  • Mold growth, assessment, and remediation — Mold assessment and mold remediation are techniques used in occupational health: mold assessment is the process of identifying the location and extent of the mold hazard in a structure, and mold remediation is the process of removal and/or… …   Wikipedia

  • Building insulation materials — A selection of insulation materials can aid in building insulation. All of these are based on standard principles of thermal insulation. Materials used to reduce heat transfer by conduction, radiation or convection are employed in varying… …   Wikipedia

  • Wood drying — (also seasoning lumber or timber seasoning) refers to reducing the moisture content of wood prior to its use. For some purposes wood is not dried at all (it is used green ) [http://en.wikipedia.org/wiki/Green wood] . Often the wood needs to be in …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”