ASTM C270-19a
(Specification)Standard Specification for Mortar for Unit Masonry
Standard Specification for Mortar for Unit Masonry
ABSTRACT
This specification covers mortars for use in the construction of non-reinforced and reinforced unit masonry structures. Four types of mortar are covered in each of two alternative specifications: (1) proportion specifications and (2) property specifications. The property specification applies to mortar mixed to a specific flow in the laboratory. When neither proportion nor property specifications are specified, the proportion specifications shall govern, unless data are presented to and accepted by the specifier to show that mortar meets the requirements of the property specifications. This specification does not cover the determination of mortar strengths through field testing. The compressive strength values resulting from field tested mortars do not represent the compressive strength of mortar tested in the laboratory nor that of the mortar in the wall. Physical properties of field sampled mortar shall not be used to determine compliance to this specification and are not intended as criteria to determine the acceptance of rejection of the mortar. Compliance to this specification is verified by confirming that the materials used are as specified, meet the requirements as given, and added to the mixer in the proper proportions as described.
SCOPE
1.1 This specification covers mortars for use in the construction of non-reinforced and reinforced unit masonry structures. Four types of mortar are covered in each of two alternative specifications: (1) proportion specifications and (2) property specifications.
Note 1: When the property specification is used to qualify masonry mortars, the testing agency performing the test methods should be evaluated in accordance with Practice C1093.
1.2 The proportion or property specifications shall govern as specified.
1.3 When neither proportion or property specifications are specified, the proportion specifications shall govern, unless data are presented to and accepted by the specifier to show that mortar meets the requirements of the property specifications.
1.4 This standard is not a specification to determine mortar strengths through field testing (see Section 3).
1.5 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
1.6 The terms used in this specification are identified in Terminologies C1180 and C1232.
1.7 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.8 The following safety hazards caveat pertains only to the test methods section of this specification: 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.
1.9 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.
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Designation:C270 −19a
Standard Specification for
1
Mortar for Unit Masonry
This standard is issued under the fixed designation C270; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 1.9 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 Thisspecificationcoversmortarsforuseintheconstruc-
ization established in the Decision on Principles for the
tion of non-reinforced and reinforced unit masonry structures.
Development of International Standards, Guides and Recom-
Four types of mortar are covered in each of two alternative
mendations issued by the World Trade Organization Technical
specifications: (1) proportion specifications and (2) property
Barriers to Trade (TBT) Committee.
specifications.
NOTE 1—When the property specification is used to qualify masonry
2. Referenced Documents
mortars, the testing agency performing the test methods should be
2
2.1 ASTM Standards:
evaluated in accordance with Practice C1093.
C5 Specification for Quicklime for Structural Purposes
1.2 Theproportionorpropertyspecificationsshallgovernas
C91/C91M Specification for Masonry Cement
specified.
C109/C109M Test Method for Compressive Strength of
1.3 When neither proportion or property specifications are
Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube
specified, the proportion specifications shall govern, unless
Specimens)
data are presented to and accepted by the specifier to show that
C110 Test Methods for Physical Testing of Quicklime,
mortar meets the requirements of the property specifications.
Hydrated Lime, and Limestone
C128 Test Method for Relative Density (Specific Gravity)
1.4 This standard is not a specification to determine mortar
and Absorption of Fine Aggregate
strengths through field testing (see Section 3).
C144 Specification for Aggregate for Masonry Mortar
1.5 The text of this specification references notes and
C150/C150M Specification for Portland Cement
footnotes which provide explanatory material. These notes and
C188 Test Method for Density of Hydraulic Cement
footnotes (excluding those in tables and figures) shall not be
C207 Specification for Hydrated Lime for Masonry Pur-
considered as requirements of the standard.
poses
1.6 The terms used in this specification are identified in
C305 Practice for Mechanical Mixing of Hydraulic Cement
Terminologies C1180 and C1232.
Pastes and Mortars of Plastic Consistency
C511 Specification for Mixing Rooms, Moist Cabinets,
1.7 The values stated in inch-pound units are to be regarded
Moist Rooms, and Water Storage Tanks Used in the
as standard. The values given in parentheses are mathematical
Testing of Hydraulic Cements and Concretes
conversions to SI units that are provided for information only
C595/C595M Specification for Blended Hydraulic Cements
and are not considered standard.
C780 Test Method for Preconstruction and Construction
1.8 The following safety hazards caveat pertains only to the
Evaluation of Mortars for Plain and Reinforced Unit
test methods section of this specification: This standard does
Masonry
not purport to address all of the safety concerns, if any,
C952 Test Method for Bond Strength of Mortar to Masonry
associated with its use. It is the responsibility of the user of this
3
Units (Withdrawn 2017)
standard to establish appropriate safety, health, and environ-
C979/C979M Specification for Pigments for Integrally Col-
mental practices and determine the applicability of regulatory
ored Concrete
limitations prior to use.
1 2
This specification is under the jurisdiction of ASTM Committee C12 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Mortars and Grouts for Unit Masonryand is the direct responsibility of Subcom- contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
mittee C12.03 on Specifications for Mortars. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved May 1, 2019. Published June 2019. Originally the ASTM website.
3
approved in 1951. Last previous edition approved in 2019 as C270 – 19. DOI: The last approved version of this historical standard is referenced on
10.1520/C0270-19A. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C270−19a
C1072 Test Methods for Measurement of Masonry Flexural 3.3 Sinc
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C270 − 19 C270 − 19a
Standard Specification for
1
Mortar for Unit Masonry
This standard is issued under the fixed designation C270; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers mortars for use in the construction of non-reinforced and reinforced unit masonry structures. Four
types of mortar are covered in each of two alternative specifications: (1) proportion specifications and (2) property specifications.
NOTE 1—When the property specification is used to qualify masonry mortars, the testing agency performing the test methods should be evaluated in
accordance with Practice C1093.
1.2 The proportion or property specifications shall govern as specified.
1.3 When neither proportion or property specifications are specified, the proportion specifications shall govern, unless data are
presented to and accepted by the specifier to show that mortar meets the requirements of the property specifications.
1.4 This standard is not a specification to determine mortar strengths through field testing (see Section 3).
1.5 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.6 The terms used in this specification are identified in Terminologies C1180 and C1232.
1.7 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.8 The following safety hazards caveat pertains only to the test methods section of this specification: 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.
1.9 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C5 Specification for Quicklime for Structural Purposes
C91/C91M Specification for Masonry Cement
C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens)
C110 Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone
C128 Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate
C144 Specification for Aggregate for Masonry Mortar
C150/C150M Specification for Portland Cement
C188 Test Method for Density of Hydraulic Cement
C207 Specification for Hydrated Lime for Masonry Purposes
C305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency
1
This specification is under the jurisdiction of ASTM Committee C12 on Mortars and Grouts for Unit Masonryand is the direct responsibility of Subcommittee C12.03
on Specifications for Mortars.
Current edition approved Feb. 1, 2019May 1, 2019. Published February 2019June 2019. Originally approved in 1951. Last previous edition approved in 20142019 as
C270 – 14a.C270 – 19. DOI: 10.1520/C0270-19.10.1520/C0270-19A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C270 − 19a
C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic
Cements and Concretes
C595/C595M Specification for Blended Hydraulic Cements
C780 Test Method for Preconstruction and Construction Evaluation
...
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