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ASTM C1699-09

Current Revision

Standard Test Method for Moisture Retention Curves of Porous Building Materials Using Pressure Plates

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1.1 This test method specifies a laboratory procedure for the determination of the water retention curve (or moisture storage capacity) of porous building materials at very high relative humidity (RH) levels ( 95 to 100% RH) corresponding to the capillary moisture region of the sorption isotherm. This is achieved by using the pressure plate test apparatus. This technique was originally developed to study soil moisture content and eventually had been adapted to building construction materials.

1.2 At higher RH levels ( 95 to 100% RH) of the sorption isotherm (see Test Method C 1498), use of climatic chamber is not an option. This technique uses overpressure to extract water out of the pore structure of porous materials until equilibrium between the moisture content in the specimens and the corresponding overpressure is achieved. Using the pressure plate extractors, equilibrium can only be reached by desorption.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


The purpose of this test is to obtain, by means of a specified laboratory procedure, the values of the equilibrium moisture content at higher RH levels (( 95 to 100%). These values are used either as means to characterize the material or as material characteristics needed as input to appropriate computer models that can simulate wetting or drying potential of individual building materials or material assemblies under specified environmental conditions.

SDO ASTM: ASTM International
Document Number C1699
Publication Date May 1, 2009
Language en - English
Page Count 4
Revision Level 09
Supercedes
Committee C16.33
Publish Date Document Id Type View
May 1, 2009 C1699-09 Revision
Oct. 15, 2008 C1699-08 Revision
March 15, 2023 C1699-09R23 Reaffirmation
May 1, 2015 C1699-09R15 Reaffirmation