ASTM C270 - 12 Standard Specification for Mortar for Unit Masonry

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Source: ASTM International

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.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

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 (purchase separately)

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
C1072 Test Method 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 for Examination and Analysis of Hardened Masonry Mortar
C1329 Specification for Mortar Cement
C1357 Test Methods for Evaluating Masonry Bond Strength
C1384 Specification for Admixtures for Masonry Mortars
C1489 Specification for Lime Putty for Structural Purposes
C1506 Test Method for Water Retention of Hydraulic Cement-Based Mortars and Plasters
C1586 Guide for Quality Assurance of Mortars
E72 Test Methods of Conducting Strength Tests of Panels for Building Construction
E514 Test Method for Water Penetration and Leakage Through Masonry
E518 Test Methods for Flexural Bond Strength of Masonry

Masonry Industry Council
HotandColdWeatherMas January 1999

Index Terms

air content; compressive strength; masonry; masonry cement; mortar; portland cement-lime; water retention; water retentivity; Masonry mortar and grout--specifications; Mortar--specifications; Cement mortars--specifications; Masonry mortar--specifications

ICS Code

ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)

DOI: 10.1520/C0270-12

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