ASTM C270-00

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

• Replaced By: ASTM C270-01 - 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 C946-23 - Standard Practice for Construction of Dry-Stacked, Surface-Bonded Walls
• 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 C1400-11(2017) - Standard Guide for Reduction of Efflorescence Potential in New Masonry Walls
• 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 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 E2266-22 - Standard Guide for Design and Construction of Low-Rise Frame Building Wall Systems to Resist Water Intrusion
• 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 – 00
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 188 Test Method for Density of Hydraulic Cement
C 207 Specification for Hydrated Lime for Masonry Pur-
1.1 This specification covers mortars for use in the construc-
2
poses
tion of non-reinforced and reinforced unit masonry structures.
C 305 Practice for Mechanical Mixing of Hydraulic Cement
Four types of mortar are covered in each of two alternative
2
Pastes and Mortars of Plastic Consistency
specifications: (1) proportion specifications and (2) property
C 511 Specification for Moist Cabinets, Moist Rooms, and
specifications.
Water Storage Tanks Used in the Testing of Hydraulic
1.2 The proportion or property specifications shall govern as
2
Cements and Concretes
specified.
2
C 595 Specification for Blended Hydraulic Cements
1.3 When neither proportion or property specifications are
C 780 Test Method for Preconstruction and Construction
specified, the proportion specifications shall govern, unless
Evaluation of Mortars for Plain and Reinforced Unit
data are presented to and accepted by the specifier to show that
4
Masonry
mortar meets the requirements of the property specifications.
C 979 Specification for Pigments for Integrally Colored
1.4 The text of this standard references notes and footnotes
4
Concrete
which provide explanatory material. These notes and footnotes
2
C 1157 Performance Specification for Hydraulic Cement
(excluding those in tables and figures) shall not be considered
C 1324 Test Method for Examination and Analysis of Hard-
as requirements of the standard.
4
ened Masonry Mortar
1.5 The following safety hazards caveat pertains only to the
2
C 1329 Specification for Mortar Cement
test methods section of this specification: This standard does
E 514 Test Method for Water Penetration and Leakage
not purport to address all of the safety concerns, if any,
4
Through Masonry
associated with its use. It is the responsibility of the user of this
E 518 Test Methods for Flexural Bond Strength of Ma-
standard to establish appropriate safety and health practices
4
sonry
and determine the applicability of regulatory limitations prior
5
2.2 International Masonry All Weather Council:
to use.
Recommended Practices and Guide Specifications for Cold
2. Referenced Documents
Weather Masonry Construction; Section 04200, Article 3
of the Guide Specifications, Sixth Edition, July 1977
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
2 mortar strengths through field testing.
Cement Mortars (Using 2-in. or 50-mm Cube Specimens)
3.2 Laboratory testing of mortar to ensure compliance with
C 110 Test Methods for Physical Testing of Quicklime,
2 the property specification requirements of this specification
Hydrated Lime, and Limestone
shall be performed in accordance with 5.2. The property
C 128 Test Method for Specific Gravity and Absorption of
3 specification of this standard applies to mortar mixed to a
Fine Aggregates
4
specific flow in the laboratory.
C 144 Specification for Aggregate for Masonry Mortar
2 3.3 The compressive strength values resulting from field
C 150 Specification for Portland Cement
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 C-12 on
Mortars for Unit Masonry and is the direct responsibility of Subcommittee C12.03
used to determine compliance to this specification and are not
on Specifications for Mortars.
intended as criteria to determine the acceptance or rejection of
Current edition approved March 10, 2000. Published April 2000. Originally
published as C 270–51T. Last previous edition C 270–99b.
2
Annual Book of ASTM Standards, Vol 04.01.
3 5
Annual Book of ASTM Standards, Vol 04.02. Available from the International Masonry All Weather Council, 823 Fifteenth
4
Annual Book of ASTM Standards, Vol 04.05. Street, NW, Washington, DC 20005.
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, it shoul
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