This specification covers load-bearing and nonload-bearing reinforced autoclaved aerated concrete (AAC) floor, roof, wall, and stair elements used as components for building construction. Installed units covered by this specification shall be protected against direct exposure to moisture using a coating material accepted by the AAC manufacturer. Concrete elements available here are grouped into three classes (AAC-2, AAC-4, and AAC-6) according to strength. Raw materials (quicklime, aggregate, Portland cement, blended cements, gypsum, pozzolan, and gas-producing agents) and steel reinforcing wires shall conform to properties as specified. Concrete elements shall be tested and adhere accordingly to physical requirements as to compressive strength, nominal dry bulk density, drying shrinkage, maximum area of corrosion and corrosion protection effectiveness, yield strength, tensile strength, reduction of area, and weld-point shear strength.

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 load-bearing and nonload-bearing reinforced autoclaved aerated concrete (AAC) floor, roof, wall, and stair elements used as components for building construction. Autoclaved aerated concrete is a cementitous 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. Installed units covered by this specification shall be protected against direct exposure to moisture using a coating material accepted by the AAC manufacturer.

1.2 The raw materials used in the production of autoclaved aerated concrete are portland cement, quartz sand, water, lime, gypsum or anhydrite, and an agent resulting in macroscopic voids. The quartz sand used as a raw material may be replaced by a siliceous fine aggregate other than sand and usually is ground to a fine powder before use. Fly ash may be used as a sand replacement. The batched raw materials are mixed together to form a slurry. The slurry is cast into steel molds. Due to the chemical reactions that take place within the slurry, the volume expands. After setting, and before hardening, the mass is machine cut with high accuracy into elements of various sizes. The elements then are steam-cured under pressure in autoclaves where the matrix is transformed into a solid calcium silicate hydrate.

LOI up to 12 % may be acceptable for production of AAC provided supporting test data is presented by the manufacturer.

1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

A82/A82M Specification for Steel Wire, Plain, for Concrete Reinforcement

C22/C22M Specification for Gypsum

C33 Specification for Concrete Aggregates

C144 Specification for Aggregate for Masonry Mortar

C150 Specification for Portland Cement

C332 Specification for Lightweight Aggregates for Insulating Concrete

C595 Specification for Blended Hydraulic Cements

C618 Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

C1386 Specification for Precast Autoclaved Aerated Concrete (AAC) Wall Construction Units

Keywords

autoclaved aerated concrete; concrete cover; corrosion protection; reinforced elements; service loading; shear strength; stairs; ultimate loading; weld point;

ICS Code

ICS Number Code 91.100.30 (Concrete and concrete products)

Citing ASTM Standards

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