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ASTM C270-14a

(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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
14-Dec-2014
ICS
91.100.10 - Cement. Gypsum. Lime. Mortar
Technical Committee
C12 - Mortars and Grouts for Unit Masonry
Drafting Committee
C12.03 - Specifications for Mortars
Current Stage
Ref Project

Relations

Replaces
ASTM C270-14 - Standard Specification for Mortar for Unit Masonry
Effective Date
15-Dec-2014
Replaced By
ASTM C270-19 - Standard Specification for Mortar for Unit Masonry
Effective Date
01-Feb-2019
Referred By
ASTM C1324-20a - Standard Test Method for Examination and Analysis of Hardened Masonry Mortar
Effective Date
15-Dec-2014
Referred By
ASTM E2266-22 - Standard Guide for Design and Construction of Low-Rise Frame Building Wall Systems to Resist Water Intrusion
Effective Date
15-Dec-2014
Referred By
ASTM C1384-18e1 - Standard Specification for Admixtures for Masonry Mortars
Effective Date
15-Dec-2014
Referred By
ASTM E1602-03(2017) - Standard Guide for Construction of Solid Fuel Burning Masonry Heaters
Effective Date
15-Dec-2014
Referred By
ASTM E2260-21a - Standard Guide for Repointing (Tuckpointing) Historic Masonry
Effective Date
15-Dec-2014
Referred By
ASTM C1314-23a - Standard Test Method for Compressive Strength of Masonry Prisms
Effective Date
15-Dec-2014
Referred By
ASTM C946-23 - Standard Practice for Construction of Dry-Stacked, Surface-Bonded Walls
Effective Date
15-Dec-2014
Referred By
ASTM C1722-23 - Standard Guide for Repair and Restoration of Dimension Stone
Effective Date
15-Dec-2014
Referred By
ASTM C1180-22 - Standard Terminology of Mortar and Grout for Unit Masonry
Effective Date
15-Dec-2014
Referred By
ASTM C1586-20 - Standard Guide for Quality Assurance of Mortars
Effective Date
15-Dec-2014
Referred By
ASTM C387/C387M-23 - Standard Specification for Packaged, Dry, Combined Materials for Concrete and High Strength Mortar
Effective Date
15-Dec-2014
Referred By
ASTM C91/C91M-23 - Standard Specification for Masonry Cement
Effective Date
15-Dec-2014
Referred By
ASTM C901-18 - Standard Specification for Prefabricated Masonry Panels
Effective Date
15-Dec-2014

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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C270 −14a
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 2. Referenced Documents
2
1.1 Thisspecificationcoversmortarsforuseintheconstruc- 2.1 ASTM Standards:
tion of non-reinforced and reinforced unit masonry structures. C5 Specification for Quicklime for Structural Purposes
Four types of mortar are covered in each of two alternative C91 Specification for Masonry Cement
specifications: (1) proportion specifications and (2) property C109/C109M Test Method for Compressive Strength of
specifications. Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube
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
1.3 When neither proportion or property specifications are
C150 Specification for Portland Cement
specified, the proportion specifications shall govern, unless
C188 Test Method for Density of Hydraulic Cement
data are presented to and accepted by the specifier to show that
C207 Specification for Hydrated Lime for Masonry Pur-
mortar meets the requirements of the property specifications.
poses
1.4 This standard is not a specification to determine mortar C305 Practice for Mechanical Mixing of Hydraulic Cement
Pastes and Mortars of Plastic Consistency
strengths through field testing (see Section 3).
C511 Specification for Mixing Rooms, Moist Cabinets,
1.5 The text of this specification references notes and
Moist Rooms, and Water Storage Tanks Used in the
footnotes which provide explanatory material. These notes and
Testing of Hydraulic Cements and Concretes
footnotes (excluding those in tables and figures) shall not be
C595 Specification for Blended Hydraulic Cements
considered as requirements of the standard.
C780 Test Method for Preconstruction and Construction
1.6 The terms used in this specification are identified in
Evaluation of Mortars for Plain and Reinforced Unit
Terminologies C1180 and C1232.
Masonry
C952 Test Method for Bond Strength of Mortar to Masonry
1.7 The values stated in inch-pound units are to be regarded
Units
as standard. The values given in parentheses are mathematical
C979 Specification for Pigments for Integrally Colored Con-
conversions to SI units that are provided for information only
crete
and are not considered standard.
C1072 Test Methods for Measurement of Masonry Flexural
1.8 The following safety hazards caveat pertains only to the
Bond Strength
test methods section of this specification: This standard does
C1093 Practice for Accreditation of Testing Agencies for
not purport to address all of the safety concerns, if any,
Masonry
associated with its use. It is the responsibility of the user of this
C1157 Performance Specification for Hydraulic Cement
standard to establish appropriate safety and health practices
C1180 Terminology of Mortar and Grout for Unit Masonry
and determine the applicability of regulatory limitations prior
C1232 Terminology of Masonry
to use.
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
Current edition approved Dec. 15, 2014. Published December 2014. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1951. Last previous edition approved in 2014 as C270 – 14. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0270-14A. 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 ----------------------
C270−14a
C1329 Specification for Mortar Cement 4.1.1 Cementitious Materials—Cementitious materials shall
C1384 Specification for Admixtures for Masonry Mortars conform to the following ASTM
...

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 − 14 C270 − 14a
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 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
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 June 1, 2014Dec. 15, 2014. Published July 2014December 2014. Originally approved in 1951. Last previous edition approved in 20122014 as
C270 – 12a.C270 – 14. DOI: 10.1520/C0270-14.10.1520/C0270-14A.
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 − 14a
C952 Test Method for Bond Strength of Mortar to Masonry Units
C979 Specification for Pigments for Integrally Colored Concrete
C1072 Test Methods for Measurement of Masonry Flexural Bond Strength
C1093 Practice for Accreditation of Testing Agencies for Masonry
C1157 Performance Specification for Hyd
...

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ABSTRACT
This specification covers unit masonry mortars whose material and design requirements are governed by a referenced ASTM document stated herein, but are preblended dry in a factory instead of produced from individual raw materials delivered to the job-site. Because field sampling, testing, directly comparable test results, packaging, and traceability of ingredients of preblended dry mortar mix differ from job site mixed mortars, this specification particularly addresses these issues, along with the tight control of ingredient ratios possible with preblended dry mortars.
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5.1 During preconstruction and construction evaluations, use of these test methods establishes specific and overall performance characteristics for the mortar system.  
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This specification covers two types of grout, fine and coarse grout, for use in the construction of masonry structures. Grout is specified by proportions or strength requirements. Materials used as ingredients in grout shall conform to the requirements specified such as: cementitious materials; blended cements; quicklime; hydrated lime; coal fly ash or raw calcine natural pozzolan; granulated blast furnace slag; air-entraining admixtures; aggregates; water; pumping aids; antifreeze compounds; and storage of materials. Fine grout shall be manufactured with fine aggregates. Coarse grout shall be manufactured with a combination of coarse and fine aggregates. Proportions of ingredients shall be determined by grout proportion requirements and by the specified compressive strength. Materials for grout shall be measured in such a way that the required proportions of the grout materials are controlled and accurately measured. Grout shall be produced using one of the following procedures: grout materials mixed with water at the job site and ready-mixed grout transported to the job site.
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Standard Test Method for Examination and Analysis of Hardened Masonry Mortar

SIGNIFICANCE AND USE
4.1 This test method provides procedures for petrographic examination and chemical analysis of mortar for components of masonry mortar. These components may include portland cement, hydrated calcitic or dolomitic lime, masonry cement, aggregates, and air.  
4.2 The test method consists of procedures and sub-procedures, each requiring a substantial degree of petrographic and chemical skills and relatively elaborate instrumentation.  
4.3 The chemical data considered together with results of petrographic examination of a mortar provide for calculation of component proportions and thus allow a determination of mortar composition as represented by Types M, N, S, and O in Table 1 (Proportion Specification Requirements) of Specification C270.  
4.4 Failure of a mortar to have the composition of any type as defined in Table 1 of Specification C270 does not necessarily mean that the mortar does not meet the requirements of Specification C270. The mortar may meet the alternative requirements of Table 2 (Property Specification Requirements) of Specification C270.  
4.5 The maleic acid method of analysis is not applicable for the analysis of mortar because it is greatly influenced by carbonation and does not provide for the determination of calcium.
SCOPE
1.1 This test method covers procedures for petrographic examination and chemical analysis of samples of masonry mortars. Based upon such examination and analysis, proportions of components in masonry mortars can be determined.
Note 1: This method is also applicable to hydraulic cement-based stucco and plaster. Some historic mortars may contain non-resolvable constituents that may interfere. However, significant information may be obtained by petrographic examinations.  
1.2 Interpretations and calculations of chemical results are dependent upon results of the petrographic examination. The use of the chemical results alone is contrary to the requirements of this test method.  
1.3 Procedures for sampling, petrographic examination, chemical analysis, and calculations of component proportions are given in the following sections:    
Section  
Sampling  
7  
Petrographic examination  
8  
Chemical analysis  
9  
Mortar proportion calculations  
10  
Report  
11  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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.  
1.6 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.  
1.7 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.

  • Standard
    7 pages
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  • Standard
    7 pages
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ASTM
ASTM C1586-20(Guide)
Standard Guide for Quality Assurance of Mortars

SIGNIFICANCE AND USE
3.1 This document is intended to provide guidance and clarification to designers, specifiers, inspectors, testing agencies, producers, and users in specifying and evaluating masonry mortar.  
3.2 Users of documents Specification C270 and Test Method C780 often confuse and sometimes inadvertently misuse parts of the two documents when specifying or evaluating masonry mortar. This guide seeks to address specific items within Specification C270 and Test Method C780 to help promote their proper use and interpretation.
SCOPE
1.1 This document provides guidance regarding the proper use of Specification C270 and Test Method C780 for evaluating masonry mortar produced in the laboratory and at the construction site.  
1.2 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.

  • Guide
    4 pages
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  • Guide
    4 pages
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ASTM
ASTM C887-20(Specification)
Standard Specification for Packaged, Dry, Combined Materials for Surface Bonding Mortar

ABSTRACT
This specification covers the materials, properties, and packaging of dry, combined materials for use as surface bonding mortar with concrete masonry units that have not been prefaced, coated, or painted. The materials used as ingredients shall consist of the following: cements which shall be a Portland cement, blended hydraulic cement, hydraulic cement, or masonry cement; Type S or SA hydrated lime; Class N, F, or S pozzolan; aggregates; glass fibers; and additives. Physical properties of the packaged materials shall conform to the flexural strength, compressive strength, time of setting, and water retention requirements. The net weight, amount of mixing water, unit weight, and yield of the surface bonding mortar shall be calculated and reported.
SCOPE
1.1 This specification covers the materials, properties, and packaging of dry, combined materials for use as surface bonding mortar with concrete masonry units that have not been prefaced, coated, or painted.  
1.2 This specification does not cover design or application. Consult the manufacturer for specific recommendations.  
1.3 Appendix X1 of this specification contains the recommended tests for evaluation of surface bonded masonry assemblages used to establish design loads for the composite wall.  
1.4 Appendix X2 through Appendix X5 of this specification contain additional tests that may be performed on surface bonding mortar.  
1.5 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.  
1.6 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. This hazard statement applies only to Section 9 of this specification.  
1.7 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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  • Technical specification
    13 pages
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