ASTM C1691

Full Name

ASTM C1691 – Standard Specification for Unreinforced Autoclaved Aerated Concrete (AAC) Masonry Units


This specification covers solid, unreinforced masonry units manufactured from autoclaved aerated concrete (AAC), a cementitious product.

This specification addresses dimensional tolerances, maximum limits for drying shrinkage, and shipping and handling.


autoclaved aerated concrete (AAC); compressive strength; density; masonry units; shrinkage


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