ASTM C1386-98
(Specification)Standard Specification for Precast Autoclaved Aerated Concrete (PAAC) Wall Construction Units
Standard Specification for Precast Autoclaved Aerated Concrete (PAAC) Wall Construction Units
SCOPE
1.1 This specification covers solid nonload-bearing and load-bearing precast concrete wall units made from autoclaved aerated concrete (PAAC) is a cementitious product based on calcium silicate hydrates in which low density is attained by the inclusion of an agent resulting in macroscopic voids and is subjected to high-pressure steam curing. The precast autoclaved aerated concrete wall units are large-size solid rectangular prisms, which are to be laid using thin-bed mortar. Installed units covered by this specification shall be protected against direct exposure to moisture using a coating material accepted by the PAAC manufacturer.
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Designation: C 1386 – 98
Standard Specification for
Precast Autoclaved Aerated Concrete (PAAC) Wall
Construction Units
This standard is issued under the fixed designation C 1386; 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.
1. Scope 2. Referenced Documents
1.1 This specification covers solid nonload-bearing and 2.1 ASTM Standards:
load-bearing precast concrete wall units made from autoclaved C 22 Specification for Gypsum
aerated concrete. Precast autoclaved aerated concrete (PAAC) C 33 Specification for Concrete Aggregates
is a cementitious product based on calcium silicate hydrates in C 110 Test Methods for Physical Testing of Quicklime,
which low density is attained by the inclusion of an agent Hydrated Lime, and Limestone
resulting in macroscopic voids and is subjected to high- C 144 Specification for Aggregate for Masonry Mortar
pressure steam curing.The precast autoclaved aerated concrete C 150 Specification for Portland Cement
wall units are large-size solid rectangular prisms, which are to C 332 Specification for Lightweight Aggregates for Insult-
be laid using thin-bed mortar. Installed units covered by this ing Concrete
specification shall be protected against direct exposure to C 472 Test Methods for Physical Testing of Gypsum,
moisture using a coating material accepted by the PAAC Gypsum Plasters, and Gypsum Concrete
manufacturer. C 595M Specification for Blended Hydraulic Cements
1.2 The raw materials used in the production of precast C 618 Specification for Coal Fly Ash and Raw or Calcined
autoclaved aerated concrete are portland cement, quartz sand, Natural Pozzolan for Use As a Mineral Admixture in
water, lime, gypsum or anhydrite, and an agent resulting in Concrete
macroscopicvoids.Thequartzsandusedasarawmaterialmay E 4 Practices for Force Verification of Testing Machines
be replaced by a siliceous fine aggregate other than sand, and
3. Classification
usually is ground to a fine powder before use. Fly ash may be
3.1 PAAC units manufactured in accordance with this
used as a sand replacement. The batched raw materials are
mixed thoroughly together to form a slurry. The slurry is cast specification are classified according to their strength class.
into steel molds. Due to the chemical reactions that take place
4. Materials and Manufacture
within the slurry, the volume expands.After setting, and before
4.1 Raw Materials— Materials shall conform to the follow-
hardening, the mass is machine cut into units of various sizes.
ing applicable specifications:
The units then are steam-cured under pressure in autoclaves
4.1.1 Portland Cement, Specification C 150.
where the material is transformed into a hard calcium silicate.
4.1.2 Blended Cements, Specification C 595.
1.3 The values stated in inch-pound units are to be regarded
4.1.3 Pozzolan, Specification C 618.
as the standard. The values given in parentheses are for
4.1.4 Gypsum, Specification C 22.
information only.
4.1.5 Aggregates, Specifications C 33, C 144, or C 332.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Physical Requirements
responsibility of the user of this standard to establish appro-
5.1 CompressiveStrength—The compressive strength of the
priate safety and health practices and determine the applica-
units shall be determined according to Section 8 and shall
bility of regulatory limitations prior to use. See Section 8,
conform to the requirements of Table 1.
Section 9, and Section 10.
1 2
This specification is under the jurisdiction of ASTM Committee C-27 on Annual Book of ASTM Standards, Vol 04.01.
Precast Concrete Products and is the direct responsibility of C27.60 on Precast Annual Book of ASTM Standards. Vol 04.02.
Autoclaved Aerated Concrete. Annual Book of ASTM Standards, Vol 04.05.
Current edition approved Feb 10, 1998. Published September 1998. Annual Book of ASTM Standards, Vol 03.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C 1386
TABLE 1 Physical Requirements
8.2.3 Loadbearing surfaces of the specimen shall be plane
Average within 0.0035 in. (0.09 mm) per 4 in. (100 mm). This can be
Nominal Dry
Strength Compressive Strength, Density Limits, lb/ Drying
achieved by grinding, milling, or capping. When capping, a
Bulk Density
3 3
Class psi (MPa) ft (kg/m ) Shrinkage,
3 3
lb/ft (kg/m )
gypsum plaster compound shall be used.
%
8.3 Procedure:
Average Min
8.3.1 The specimen shall be placed in the testing machine
PAAC-2 360 (2.5) 290 (2.0) 25 (400) 22 (350)–28 (450)
and the load applied perpendicular to the direction of rise
31 (500) 28 (450)–34 (550)
PAAC-4 725 (5.0) 580 (4.0) 31 (500) 28 (450)–34 (550) # 0.02
during manufacture.
37 (600) 34 (550)–41 (650)
8.3.2 SpeedofTesting—Applytheloaduptoonehalfofthe
44 (700) 41 (650)–47 (750)
expected maximum load at a convenient rate, after which
50 (800) 47 (750)–53 (850)
PAAC-6 1090 (7.5) 870 (6.0) 37 (600) 35 (550)–41 (650) adjust the controls of the machine as required to give a uniform
44 (700) 41 (650)–47 (750)
rate of travel of the moving head such that the remaining load
50 (800) 47 (750)–53 (850)
is applied in not less than one nor more than two minutes.
8.3.3 Calculate the compressive strength of each specimen
as follows:
5.2 Dry Bulk Density— The dry bulk density shall be
P
Compressive strength, f 5 (1)
determined according to Section 9 and shall conform to the A
requirements of Table 1.
where:
5.3 Drying Shrinkage— The drying shrinkage shall be
f 5 compressive strength of the specimen, psi (or Pa),
determined in accordance with Section 10, and the average
P 5 maximum load, lbf (or N), indicated by the testing
drying shrinkage shall conform to the requirements of Table 1.
machine, and
2 2
A 5 gross cross sectional area of the specimen, in. (mm ).
6. Dimensions and Permissible Variations
8.4 The compressive strength shall be reported to the
6.1 The dimensions of the units shall be as specified by the
nearest 10 psi (69 kPa) for each specimen and as the average
PAAC manufacturer.
for three specimens.
6.2 No overall unit dimension (width, height, and length)
shall differ by more than ⁄8 in. (3 mm) from the specified
9. Moisture Content and Bulk Density Test
standard dimensions.
9.1 Apparatus:
9.1.1 Balance, shall be sensitive within 0.5 % of the mass of
7. Visual Inspection
the specimen.
7.1 All units shall be sound and free of defects that would
9.2 Test Specimens— Three test specimens, as described in
interfere with the proper placing of the unit or impair the
8.2, shall be used for calculating the bulk density.
strength or permanence of the construction. Minor imperfec-
9.3 Procedure:
tions incidental to the usual methods of manufacture, or
9.3.1 The mass of the specimens shall be determined and
resulting from customary methods of handling in shipment and
then dried in a ventilated oven at 212 to 230 °F (100 to 110 °C)
delivery, shall not be deemed grounds for rejection.
for not less than 24 h, and until two successive determinations
ofmassatintervalsof2hshowanincrementoflossnotgreater
8. Compressive Strength Test
than 0.2 % of the last previously determined mass of the
8.1 Apparatus: specimen.
9.3.2 Calculate the moisture content of each specimen as
8.1.1 Testing Machine— The testing machine shall conform
to the requirements prescribed in Practice E 4. The machine follows:
shall be equipped with two steel bearing blocks one of which
Moisture content %, MC 5 A2B /B 3 100 (2)
~ !
is a spherically seated block that will transmit load to the upper
where:
surface of the specimen, and the other a plane rigid block on
MC 5 moisture content, %
which the specimen will rest.
A 5 sampled mass of specimen, lb (kg), and
8.2 Test Specimens:
B 5 dry mass of specimen, lb (kg).
8.2.1 Three cube specimens of 4 in. (100 mm) edge length
9.3.2.1 Report the average moisture content of all of the
shall be tested in an air dried condition (5 to 15 % by mass
specimens as the moisture content of the lot.
moisture content). If the samples have to be dried before
9.3.3 The dimensions of the test specimens are determined
testing to reach that moisture content, they shall be stored at a
with a caliper
...
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