ASTM C1922-23
(Test Method)Standard Test Method for Water Retention of Hydraulic Cement-Based Mortars and Plasters by Way of Water Loss
Standard Test Method for Water Retention of Hydraulic Cement-Based Mortars and Plasters by Way of Water Loss
SIGNIFICANCE AND USE
5.1 This test method provides a means for determining the ability of mortars and plasters to retain water when applied to specific substrates based on the intended use of the tested mortar.
5.2 The results obtained using this test method may be used to compare the relative ability of mortars and plasters to retain water when applied to different substrates or in comparison to other mortars or plasters applied to the same substrate.
5.2.1 If applied to the same substrate, water retention values of different mortar can be compared.
5.2.2 One mortar may be applied to different substrates to understand the impact of varying substrates on water retention of the mortar.
5.3 The results obtained using this test method do not necessarily indicate the degree of water retention when used with substrates found in the field. This is because the amount of water absorbed by the substrate depends not only on the ability of the mortar to retain water but also on the particular absorption of the substrate and environmental conditions. Environmental conditions are not taken into account in this test method.
5.4 The results obtained using this test method for plasters (stucco) do not necessarily indicate the degree of water retention when the plaster is applied as a second coat on the surface of a previously applied plaster base coat, since the amount of water absorbed from the second coat of plaster depends on the rate of absorption of the base coat. This is also true when a plaster is applied as a coating on masonry units.
SCOPE
1.1 This test method provides for the determination of water retention of hydraulic cement based mortars and plasters. Water Retention is directly measured through the absorption of water from the mortar by the substrate. Various substrates may be chosen by the user based on the intended use of the tested mortar. This test method defines such substrates. Comparisons can be made between different mortars on the same substrate or the same mortar on different substrates.
1.2 This test method provides a water retention value via direct water loss, while Test Method C1506 provides a water retention value via mortar flow.
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. When combined standards are cited, the selection of the measurement systems is at the user’s discretion subject to the requirements of the referenced standard.
1.4 The text of this test method references notes and footnotes that provide explanatory material. These notes and footnotes, excluding those in tables and figures, shall not be considered as requirements of this standard.
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See the Safety Data Sheet for safety information regarding the materials being tested.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1922 − 23
Standard Test Method for
Water Retention of Hydraulic Cement-Based Mortars and
1
Plasters by Way of Water Loss
This standard is issued under the fixed designation C1922; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
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2.1 ASTM Standards:
1.1 This test method provides for the determination of water
C219 Terminology Relating to Hydraulic and Other Inor-
retention of hydraulic cement based mortars and plasters.
ganic Cements
Water Retention is directly measured through the absorption of
C305 Practice for Mechanical Mixing of Hydraulic Cement
water from the mortar by the substrate. Various substrates may
Pastes and Mortars of Plastic Consistency
be chosen by the user based on the intended use of the tested
C373 Test Methods for Determination of Water Absorption
mortar. This test method defines such substrates. Comparisons
and Associated Properties by Vacuum Method for Pressed
can be made between different mortars on the same substrate or
Ceramic Tiles and Glass Tiles and Boil Method for
the same mortar on different substrates.
Extruded Ceramic Tiles and Non-tile Fired Ceramic
1.2 This test method provides a water retention value via
Whiteware Products
direct water loss, while Test Method C1506 provides a water
C1325 Specification for Fiber-Mat Reinforced Cementitious
retention value via mortar flow.
Backer Units
C1375 Guide for Substrates Used in Testing Building Seals
1.3 Units—The values stated in SI units are to be regarded
and Sealants
as standard. No other units of measurement are included in this
C1396 Specification for Gypsum Board
standard. When combined standards are cited, the selection of
C1506 Test Method for Water Retention of Hydraulic
the measurement systems is at the user’s discretion subject to
Cement-Based Mortars and Plasters
the requirements of the referenced standard.
C1585 Test Method for Measurement of Rate of Absorption
1.4 The text of this test method references notes and of Water by Hydraulic-Cement Concretes
C1623 Specification for Manufactured Concrete Masonry
footnotes that provide explanatory material. These notes and
Lintels
footnotes, excluding those in tables and figures, shall not be
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considered as requirements of this standard.
2.2 ANSI Standards:
A118 American National Standard Specifications for the
1.5 This standard does not purport to address all of the
Installation of Ceramic Tile
safety concerns, if any, associated with its use. It is the
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responsibility of the user of this standard to establish appro-
2.3 ISO Standards:
priate safety, health, and environmental practices and deter-
13007-2 Ceramic Tiles: Products for Installation Part 2
mine the applicability of regulatory limitations prior to use. Adhesives – Test Methods
See the Safety Data Sheet for safety information regarding the
materials being tested. 3. Terminology
1.6 This international standard was developed in accor-
3.1 Definitions—For definitions of terms used in this
dance with internationally recognized principles on standard-
specification, refer to Terminology C219.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Barriers to Trade (TBT) Committee.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
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This test method is under the jurisdiction of ASTM Committee C01 on Cement 4th Floor, New York, NY 10036, http://www.ansi.org.
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and is the direct responsibility of Subcommittee C01.22 on Workability. Available from International Organization for Standardization (ISO), ISO
Current edition approved June 1, 2023. Published July 2023. DOI: 10.1520/ Central Secretariat, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
C1922-23. Switzerland, https://www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1922 − 23
4. Summary of Test Method thickness (see Note 1). The edges when placed on a plane
surface shall not depart from straightness by more than 1 mm.
4.1 The mortar
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