ASTM C270-01

Standard Specification for Mortar for Unit Masonry

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.  
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 standard 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 the standard  
1.5 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.

General Information

• Status: Historical
• Publication Date: 09-Nov-2001
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C12 - Mortars and Grouts for Unit Masonry
• Drafting Committee: C12.03 - Specifications for Mortars

Relations

• Replaces: ASTM C270-00 - Standard Specification for Mortar for Unit Masonry
• Effective Date: 10-Nov-2001
• Replaced By: ASTM C270-01a - Standard Specification for Mortar for Unit Masonry
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1722-23 - Standard Guide for Repair and Restoration of Dimension Stone
• Effective Date: 10-Nov-2001
• Referred By: ASTM C901-18 - Standard Specification for Prefabricated Masonry Panels
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1180-22 - Standard Terminology of Mortar and Grout for Unit Masonry
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1403-22a - Standard Test Method for Rate of Water Absorption of Masonry Mortars
• Effective Date: 10-Nov-2001
• Referred By: ASTM C780-23 - Standard Test Methods for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry
• Effective Date: 10-Nov-2001
• Referred By: ASTM C946-23 - Standard Practice for Construction of Dry-Stacked, Surface-Bonded Walls
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1791-16(2021) - Standard Guide for Reduction of Efflorescence Potential in New Unit Pavement Systems
• Effective Date: 10-Nov-2001
• Referred By: ASTM E2260-21a - Standard Guide for Repointing (Tuckpointing) Historic Masonry
• Effective Date: 10-Nov-2001
• Referred By: ASTM C91/C91M-23 - Standard Specification for Masonry Cement
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1384-18e1 - Standard Specification for Admixtures for Masonry Mortars
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1072-22 - Standard Test Methods for Measurement of Masonry Flexural Bond Strength
• Effective Date: 10-Nov-2001
• Referred By: ASTM C141/C141M-14(2022) - Standard Specification for Hydrated Hydraulic Lime for Structural Purposes
• Effective Date: 10-Nov-2001
• Referred By: ASTM C1400-11(2017) - Standard Guide for Reduction of Efflorescence Potential in New Masonry Walls
• Effective Date: 10-Nov-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 270 – 01
Standard Specification for
1
Mortar for Unit Masonry
This standard is issued under the fixed designation C 270; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
2
1. Scope * C 150 Specification for Portland Cement
2
C 188 Test Method for Density of Hydraulic Cement
1.1 This specification covers mortars for use in the construc-
C 207 Specification for Hydrated Lime for Masonry Pur-
tion of non-reinforced and reinforced unit masonry structures.
2
poses
Four types of mortar are covered in each of two alternative
C 305 Practice for Mechanical Mixing of Hydraulic Cement
specifications: (1) proportion specifications and (2) property
2
Pastes and Mortars of Plastic Consistency
specifications.
C 511 Specification for Moist Cabinets, Moist Rooms, and
1.2 The proportion or property specifications shall govern as
Water Storage Tanks Used in the Testing of Hydraulic
specified.
2
Cements and Concretes
1.3 When neither proportion or property specifications are
2
C 595 Specification for Blended Hydraulic Cements
specified, the proportion specifications shall govern, unless
C 780 Test Method for Preconstruction and Construction
data are presented to and accepted by the specifier to show that
Evaluation of Mortars for Plain and Reinforced Unit
mortar meets the requirements of the property specifications.
4
Masonry
1.4 The text of this standard references notes and footnotes
C 979 Specification for Pigments for Integrally Colored
which provide explanatory material. These notes and footnotes
3
Concrete
(excluding those in tables and figures) shall not be considered
2
C 1157 Performance Specification for Hydraulic Cement
as requirements of the standard.
C 1324 Test Method for Examination and Analysis of Hard-
1.5 The following safety hazards caveat pertains only to the
4
ened Masonry Mortar
test methods section of this specification: This standard does
2
C 1329 Specification for Mortar Cement
not purport to address all of the safety concerns, if any,
E 514 Test Method for Water Penetration and Leakage
associated with its use. It is the responsibility of the user of this
4
Through Masonry
standard to establish appropriate safety and health practices
E 518 Test Methods for Flexural Bond Strength of Ma-
and determine the applicability of regulatory limitations prior
4
sonry
to use.
5
2.2 Masonry Industry Council:
2. Referenced Documents Hot and Cold Weather Masonry Construction Manual, Janu-
ary 1999
2.1 ASTM Standards:
2
C 5 Specification for Quicklime for Structural Purposes
3. Specification Limitations
2
C 91 Specification for Masonry Cement
3.1 Specification C 270 is not a specification to determine
C 109 Test Method for Compressive Strength of Hydraulic
mortar strengths through field testing.
Cement Mortars (Using 2-in. or [50-mm] Cube Speci-
2 3.2 Laboratory testing of mortar to ensure compliance with
mens)
the property specification requirements of this specification
C 110 Test Methods for Physical Testing of Quicklime,
2 shall be performed in accordance with 5.2. The property
Hydrated Lime, and Limestone
specification of this standard applies to mortar mixed to a
C 128 Test Method for Density, Relative Density (Specific
3 specific flow in the laboratory.
Gravity), and Absorption of Fine Aggregates
4
3.3 The compressive strength values resulting from field
C 144 Specification for Aggregate for Masonry Mortar
tested mortars do not represent the compressive strength of
mortar as tested in the laboratory nor that of the mortar in the
1
wall. Physical properties of field sampled mortar shall not be
This specification is under the jurisdiction of ASTM Committee C12 on
Mortars and Grouts for Unit Masonry and is the direct responsibility of Subcom-
used to determine compliance to this specification and are not
mittee C12.03 on Specifications for Mortars.
intended as criteria to determine the acceptance or rejection of
Current edition approved Aug. 10, 2001. Published October 2001. Originally
published as C 270–51T. Last previous edition C 270–00.
2
Annual Book of ASTM Standards, Vol 04.01.
3 5
Annual Book of ASTM Standards, Vol 04.02. Available from the Mason Contractors Association of America, 1910 South
4
Annual Book of ASTM Standards, Vol 04.05. Highland Avenue, Suite 101, Lombard, IL 60148.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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C 270
NOTE 1—If calcium chloride is allowed,
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