ASTM C1555-03
(Practice)Standard Practice for Autoclaved Aerated Concrete Masonry
Standard Practice for Autoclaved Aerated Concrete Masonry
SCOPE
1.1 This practice applies to construction and testing of masonry made of AAC units. It includes or references terminology, material specifications, and methods of test. It references specifications and test methods.
1.2 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.
1.3 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.
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Standards Content (Sample)
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Designation: C 1555 – 03
Standard Practice for
Autoclaved Aerated Concrete Masonry
This standard is issued under the fixed designation C 1555; 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.
INTRODUCTION
Masonry units of autoclaved aerated concrete (AAC) can be produced with dimensional tolerances
as small as ⁄16 in. (1.5 mm). As a consequence, AAC masonry units can be laid with mortar joints
approximately ⁄8 in. (9 mm) thick, and also with thinner joints. The exterior face of the resulting AAC
masonry wall is then protected from the elements using an exterior wythe of masonry, a cladding
system, or a breathable coating resistant to penetration by liquid water. The interior face can be
plastered, furred, or painted.
1. Scope E 514 Test Method for Water Penetration and Leakage
Through Masonry
1.1 This practice applies to construction and testing of
E 518 Test Methods for Flexural Bond Strength of Ma-
masonry made of AAC units. It includes or references termi-
sonry
nology, material specifications, and methods of test. It refer-
E 519 Test Method for Diagonal Tension (Shear) in Ma-
ences specifications and test methods.
sonry Assemblages
1.2 Units—The values stated in inch-pound units are to be
2.2 Other Documents:
regarded as standard. The values given in parentheses are
Autoclaved Aerated Concrete: Properties, Testing and De-
mathematical conversions to SI units which are provided for
sign, RILEM Recommended Practice, RILEM Technical
information only and are not considered standard.
Committees 78-MCA and 51-ALC,E&FN Spon, Lon-
1.3 This standard does not purport to address all of the
don, 1993
safety concerns, if any, associated with its use. It is the
Specification for Masonry Structures (ACI 530.1-02 / ASCE
responsibility of the user of this standard to establish appro-
6-02 / TMS 602-02), as reported by the Masonry Standards
priate safety and health practices and determine the applica-
Joint Committee (MSJC), American Concrete Institute
bility of regulatory limitations prior to use.
(Farmington Hills, Michigan), American Society of Civil
2. Referenced Documents Engineers (Reston, Virginia), and The Masonry Society,
Boulder, Colorado), 2002
2.1 ASTM Standards:
C 270 Specification for Mortar for Unit Masonry
3. Terminology
C 476 Specification for Grout for Masonry
3.1 Definitions—Terms defined in Terminology C 1232
C 1072 Test Method for Method for Measurement of Flex-
shall apply in this practice.
ural Bond Strength
3.2 Definitions of Terms Specific to This Standard:
C 1232 Terminology of Masonry
3.2.1 autoclaved aerated concrete (AAC)—low-density ce-
C 1386 Specification for Precast Autoclaved Aerated Con-
mentitious product of calcium silicate hydrates in which the
crete High-Precision Wall Construction Units
low density is obtained by the formation of macroscopic air
E 72 Methods of Conducting Strength Tests of Panels for
bubbles, mainly by chemical reactions within the mass during
Wall Construction
the liquid or plastic phase. The air bubbles are uniformly
E 96 Test Methods for Water Vapor Transmission of Mate-
2 distributed and are retained in the matrix on setting, hardening,
rials
and subsequent high-pressure steam curing, to produce a
cellular structure. Material specifications for this product are
This practice is under the jurisdiction of ASTM Committee C15 on Manufac-
prescribed in Specification C 1386.
tured Masonry Units and is the direct responsibility of Subcommittee C15.10 on
3.2.2 thick-bed AAC masonry—AAC masonry whose mor-
Autoclaved Aerated Concrete Masonry Units.
tar joints are approximately ⁄8 in. (10 mm) thick.
Current edition approved Jan. 10, 2003. Published July 2003.
Annual Book of ASTM Standards,Vol
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C1555–03
C 1072) for AAC masonry, Methods E 72 should be used to establish
3.2.3 thin-bed AAC masonry—AAC masonry whose mortar
1 design stresses.
joints are approximately ⁄16 in. (1.5 mm) thick.
6.3 Shear Strength Test for AAC Masonry Assemblages—If
4. Significance and Use
required, conduct shear strength tests in accordance with Test
4.1 This practice applies to the materials and methods used
Method E 519. Cure the gypsum capping material for at least
in the construction of AAC masonry. It directly references the
6 h prior to testing.
AAC materials standards under the jurisdiction of ASTM
6.4 Modulus of Elasticity of AAC Units—
Committee C27 and the workmanship standards of the Speci-
NOTE 4—If required, the modulus of elasticity should be determined in
fication for Masonry Structures, and supplements those work-
accordance with CXXXX, currently under development by C27.60.
manship standards with additional requirements particular to
AAC masonry.
7. Workmanship for Thick-bed AAC Masonry
7.1 Workmanship shall be in accordance with the Specifi-
5. Materials
cation for Masonry Structures (Part 3–Execution), and with the
5.1 AAC masonry units shall conform to Specification
additional requirements of this standard.
C 1386.
7.2 Install the first course in a full bed of mortar conforming
5.2 Mortar for thick-bed AAC masonry shall meet the
to Specification C 270, Type M, S or N.
performance standards prescribed by the AAC manufacturer.
7.3 Use thick-bed mortar complying with 5.2.
5.3 Mortar for thin-bed AAC masonry shall meet the per-
7.4 Mix thick-bed mortar as prescribed by the AAC manu-
formance standards prescribed by the AAC manufacturer.
facturer.
NOTE 1—In general, AAC manufacturers’ performance standards for
7.5 Lay subsequent courses using thick-bed mortar, follow-
mortar for AAC masonry address minimum dry compressive strength,
ing the provisions of the Specification for Masonry Structures
minimum wet compressive strength, minimum bond strength, minimum
(Part 3–Execution) for laying solid units.
open time, and minimum working time. They also require that the mortar
7.6 Make minor adjustments by sanding the exposed faces
provide sufficient bond to the AAC masonry unit so that flexural tensile
of the units using a sanding board.
strength is controlled by the flexural tensile strength of the units rather
7.7 If it is necessary to field-cut units, cut them to tolerances
than by the bond between units and mortar.
consistent with 5.1.
5.4 Grout shall conform to Specification C 476.
7.8 If AAC masonry is to be grouted, wet it thoroughly
before gr
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