ASTM C270-12a
(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 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.
1.5 The terms used in this specification are identified in Terminologies C1180 and C1232.
1.6 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.
1.7 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:C270 −12a
StandardSpecification 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 Department of Defense.
1. Scope* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 Thisspecificationcoversmortarsforuseintheconstruc-
C5 Specification for Quicklime for Structural Purposes
tion of non-reinforced and reinforced unit masonry structures.
C91 Specification for Masonry Cement
Four types of mortar are covered in each of two alternative
C109/C109M Test Method for Compressive Strength of
specifications: (1) proportion specifications and (2) property
Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube
specifications.
Specimens)
NOTE 1—When the property specification is used to qualify masonry
C110 Test Methods for Physical Testing of Quicklime,
mortars, the testing agency performing the test methods should be
Hydrated Lime, and Limestone
evaluated in accordance with Practice C1093.
C128 Test Method for Density, Relative Density (Specific
1.2 Theproportionorpropertyspecificationsshallgovernas
Gravity), and Absorption of Fine Aggregate
specified.
C144 Specification for Aggregate for Masonry Mortar
C150 Specification for Portland Cement
1.3 When neither proportion or property specifications are
C188 Test Method for Density of Hydraulic Cement
specified, the proportion specifications shall govern, unless
C207 Specification for Hydrated Lime for Masonry Pur-
data are presented to and accepted by the specifier to show that
poses
mortar meets the requirements of the property specifications.
C305 Practice for Mechanical Mixing of Hydraulic Cement
1.4 The text of this specification references notes and
Pastes and Mortars of Plastic Consistency
footnotes which provide explanatory material. These notes and
C511 Specification for Mixing Rooms, Moist Cabinets,
footnotes (excluding those in tables and figures) shall not be
Moist Rooms, and Water Storage Tanks Used in the
considered as requirements of the standard.
Testing of Hydraulic Cements and Concretes
C595 Specification for Blended Hydraulic Cements
1.5 The terms used in this specification are identified in
C780 Test Method for Preconstruction and Construction
Terminologies C1180 and C1232.
Evaluation of Mortars for Plain and Reinforced Unit
1.6 The values stated in inch-pound units are to be regarded Masonry
as standard. The values given in parentheses are mathematical
C952 Test Method for Bond Strength of Mortar to Masonry
conversions to SI units that are provided for information only Units
and are not considered standard.
C979 Specification for Pigments for Integrally Colored Con-
crete
1.7 The following safety hazards caveat pertains only to the
C1072 Test Methods for Measurement of Masonry Flexural
test methods section of this specification:This standard does
Bond Strength
not purport to address all of the safety concerns, if any,
C1093 Practice for Accreditation of Testing Agencies for
associated with its use. It is the responsibility of the user of this
Masonry
standard to establish appropriate safety and health practices
C1157 Performance Specification for Hydraulic Cement
and determine the applicability of regulatory limitations prior
C1180 Terminology of Mortar and Grout for Unit Masonry
to use.
C1232 Terminology of Masonry
C1324 Test Method for Examination and Analysis of Hard-
ened Masonry Mortar
1
This specification is under the jurisdiction of ASTM Committee C12 on
Mortars and Grouts for Unit Masonryand is the direct responsibility of Subcom-
2
mittee C12.03 on Specifications for Mortars. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
CurrenteditionapprovedJune1,2012.PublishedJuly2012.Originallyapproved contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in 1951. Last previous edition approved in 2012 as C270 – 12. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
C0270-12A. 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 ----------------------
C270−12a
C1329 Specification for Mortar Cement 4.1.2 Aggregates—See Specification C144.
C1384 Specification for Admixtures for Masonry Mortars
4.1.3 Water—Water shall be clean and free of amounts of
C1489 Specification for Lime Putty for Structural Purposes
oils,acids,alkalies,salts,organicmaterials,orothersubstances
...
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 − 12 C270 − 12a
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 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 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.
1.5 The terms used in this specification are identified in Terminologies C1180 and C1232.
1.6 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.
1.7 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C5 Specification for Quicklime for Structural Purposes
C91 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 Density, Relative Density (Specific Gravity), and Absorption of Fine Aggregate
C144 Specification for Aggregate for Masonry Mortar
C150 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
C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic
Cements and Concretes
C595 Specification for Blended Hydraulic Cements
C780 Test Method for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry
C952 Test Method for Bond Strength of Mortar to Masonry Units
C979 Specification for Pigments for Integrally Colored Concrete
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 Jan. 1, 2012June 1, 2012. Published January 2012July 2012. Originally approved in 1951. Last previous edition approved in 20102012 as
C270 – 10.C270 – 12. DOI: 10.1520/C0270-12.10.1520/C0270-12A.
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 − 12a
C1072 Test Methods for Measurement of Masonry Flexural Bond Strength
C1093 Practice for Accreditation of Testing Agencies for Masonry
C1157 Performance Specification for Hydraulic Cement
C1180 Terminology of Mortar and Grout for Unit Masonry
C1232 Terminology of Masonry
C1324 Test Method
...
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