Concrete moisture meters

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 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. [Why are We Still Having Problems with Moisture? http://www.concreteconstruction.net/industry-news.asp?sectionID=718&articleID=616752 ASTM F 2170] 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.” ["Concrete Moisture Meters and Calcium Chloride Tests: There Are Better Ways to Test Concrete for Moisture FCI" http://www.fcimag.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_10000000000000187293 ] The results can determine where the best place to put a concrete relative humidity test.

To determine if an area has high surface moisture, a known dry area should be first tested and then compared to a reading from the area in question.

Why concrete moisture meter should not be used as a final reading.

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 in the slab. [Accurate Relative Humidity Testing Vs. Testing With ‘Moisture’ Meters: KNOW THE FACTS http://www.wwwagner.com/news.php?a=detail&id=33 ]

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. [How Confident Are You In Moisture Testing? http://www.ntlfloortrends.com/Articles/Column/BNP_GUID_9-5-2006_A_10000000000000217849] 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. [ASTM F 2170, ”Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes,” ASTM International.] 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


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • 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.… …   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

  • wood — wood1 woodless, adj. /wood/, n. 1. the hard, fibrous substance composing most of the stem and branches of a tree or shrub, and lying beneath the bark; the xylem. 2. the trunks or main stems of trees as suitable for architectural and other… …   Universalium

  • Wood — /wood/, n. 1. Grant, 1892 1942, U.S. painter. 2. Leonard, 1860 1927, U.S. military doctor and political administrator. * * * I Hard, fibrous material formed by the accumulation of secondary xylem produced by the vascular cambium. It is the… …   Universalium

  • 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

  • Damp (structural) — For other uses, see Damp (disambiguation). Detail showing some of the causes of damp penetration Structural dampness refers to the presence of unwanted moisture in the structure of a building, either the result of intrusion from outside or… …   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

  • Quezon, Isabela — Infobox Philippine municipality infoboxtitle = Municipality of Quezon sealfile = Quezon isabela.png locatormapfile = Ph locator isabela quezon.png| caption = Map of Isabela showing the location of Quezon. region = Cagayan Valley (Region II)… …   Wikipedia

  • Chiapas — Estado Libre y Soberano de Chiapas   State   …   Wikipedia

Share the article and excerpts

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