Standard Guide for Quality Assurance of Mortars

SIGNIFICANCE AND USE
This document is intended to provide guidance and clarification to designers, specifiers, inspectors, testing agencies, producers, and users in specifying and evaluating masonry mortar.
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.

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31-Oct-2011
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C1586 − 05 (Reapproved 2011)
Standard Guide for
Quality Assurance of Mortars
This standard is issued under the fixed designation C1586; 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.
1. Scope volumetricproportionsofcementitiousmaterialsandaggregate
as set forth in Table 1, Proportion Specifications, of Specifica-
1.1 This document provides guidance regarding the proper
tion C270 for the Type of mortar specified. This procedure of
use of Specification C270 and Test Method C780 for evaluat-
specifying mortar requires no sampling and testing of mortar,
ing masonry mortar produced in the laboratory and at the
and hence, no measurement of mortar properties in the labo-
construction site.
ratory or the field is required. All that is necessary is field
2. Referenced Documents confirmation of the proper proportions of the mixes used in
2 construction.
2.1 ASTM Standards:
C144 Specification for Aggregate for Masonry Mortar
4.3 Property Specifications—These Specifications require
C270 Specification for Mortar for Unit Masonry
testing of laboratory-prepared mortar for compliance with the
C780 Test Method for Preconstruction and Construction
requirements of Table 2, Property Specifications, of Specifica-
Evaluation of Mortars for Plain and Reinforced Unit
tion C270 for the Type of mortar specified.
Masonry
4.3.1 The Property Specifications require evaluation of a
mortar with a consistency (flow) of 110 6 5 %. This is an
3. Significance and Use
arbitrarily established mortar consistency that is used to
3.1 This document is intended to provide guidance and
approximate the water content of mortar after it is placed in a
clarification to designers, specifiers, inspectors, testing
masonry assemblage with absorbent masonry units. The
agencies, producers, and users in specifying and evaluating
amount of water required in mortar produced at the construc-
masonry mortar.
tion site is normally greater than the amount used for Specifi-
cation C270 Property Specifications testing.
3.2 Users of documents Specification C270 and Test
4.3.2 Do not use the Specification C270 Property Specifi-
Method C780 often confuse and sometimes inadvertently
cations requirements to evaluate construction site-produced
misuse parts of the two documents when specifying or evalu-
mortars. Due to the higher amount of water necessary for
ating masonry mortar. This guide seeks to address specific
actual masonry construction, mortar produced and sampled in
items within Specification C270 andTest Method C780 to help
the field will typically have lower compressive strength than
promote their proper use and interpretation.
that produced in the laboratory per Specification C270.
4. Specifying Masonry Mortar
4.3.3 When mortar is specified by the Property
4.1 Use Specification C270 to specify masonry mortar by Specifications, the quantities of cementitious materials and
either the Proportion or Property Specifications of that aggregates as determined through laboratory testing are con-
standard, but not both. If neither the Proportion nor Property verted to volumetric proportions to produce masonry mortar at
specification is given, Specification C270 the Proportion speci- the construction site.
fication to be used.
5. Quality Assurance of Masonry Mortar
4.2 Proportion Specifications—These Specifications direct
the mason to produce the masonry mortar using designated
5.1 Mortar Materials—Verify that individual mortar mate-
rials being used meet the ASTM Standards listed under the
Materials Section of Specification C270. Compliance is typi-
This guide is under the jurisdiction of ASTM Committee C12 on Mortars and
Grouts for Unit Masonryand is the direct responsibility of Subcommittee C12.03 on
cally verified by submission of a letter of certification or test
Specifications for Mortars.
report for each mortar material.
Current edition approved Nov. 1, 2011. Published November 2011. Originally
NOTE 1—If any of the materials used do not comply with the material
approved in 2004. Last previous edition approved in 2005 as C1586 – 05. DOI:
requirements of Specification C270, the Proportion Specifications can not
10.1520/C1586-05R11.
be used. Specification C270 specifically permits the use of masonry sands
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
that do not comply with the gradation requirements of Specification C144
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 provided that the Property Specifications of Specification C270 are used
the ASTM website. rather than the Proportion Specifications.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1586 − 05 (2011)
5.2 Property Specifications—Verify that the tested proper- and laboratory-produced mortars. Furthermore, mortar com-
ties of the labora
...

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