Secondly, a choice must be made between specifying proportions or properties listed in ASTM C The ASTM Standard C (Mortar for Unit Masonry). ASTM C/ASTM C Masonry Mortar Evaluation. Amerimix Mortar Mix WRM. US MIX Co. South Santa Fe Drive. Denver, CO ments of ASTM C Requirements for sand to be used with mortar cement to produce ASTM C mortars are found in ASTM C Physical Properties.

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Historical Version s – view previous versions of standard. Work Item s – proposed revisions of this standard.

ASTM C – 12a Standard Specification for Mortar for Unit Masonry

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: The property specification applies to mortar mixed to a asmt 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 adtm 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. When the property specification is used to qualify masonry mortars, the testing agency performing the test methods should be evaluated in accordance with Practice C These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard.

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The values given in parentheses are mathematical conversions to SI units that f270 provided for information only and are not considered standard. This standard does not purport to address all of the safety concerns, if any, associated with its use.

ASTM C – 14a Standard Specification for Mortar for Unit Masonry

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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. C Specification for Admixtures for Masonry Mortars.

Link to Active This link will always route to the current Active version of the standard.