SEDL / STP / STP1030-EB / STP23296S

A Summary of the Manufacture, Uses, and Properties of Autoclaved Aerated Concrete

Mathey, RG
Center for Building Technology, National Institute of Standards and Technology, Gaithersburg, MD

Rossiter, WJ
Center for Building Technology, National Institute of Standards and Technology, Gaithersburg, MD

Pages: 23    Published: Jan 1990

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Abstract

This report is a review of the properties and performance of autoclaved aerated concrete. The material has a relatively low thermal conductivity combined with load-bearing capacity for use in structural and non-structural applications. This feature may make its use attractive for energy-conserving applications.

The review addressed an overview of the manufacturing process, uses of autoclaved aerated concrete in building constructions, properties, energy considerations, the availability of code-related documents, and standards. Uses include block and panel construction in load-bearing and non-load-bearing applications for walls, floors, and roofs. Many properties are reviewed including density, fire resistance, moisture expansion and shrinkage, strength, structure, and thermal conductivity. With regard to energy considerations, the review points out that, for energy-efficient applications under severe climatic conditions, the autoclaved aerated concrete unit alone may be insufficient to provide the targeted minimum value of thermal resistance. In these cases, autoclaved aerated concrete has to be used together with additional thermal insulation. In contrast, autoclaved aerated concrete alone may satisfy insulation needs in areas having mild climates.