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There are many ways in which a building can fail structurally. Aerated concrete masonry units do a good job of resisting these failure modes. The structural performance of aerated concrete masonry units is measured in pounds per square inch. ASTM E-447 examines the compressive strength of aerated concrete. It says that the minimum compressive strength of masonry is 348 psi for AC2, 580 psi for AC4 and 870 psi for AC6. For permeability failure analysis, aerated concrete must live up to ASTM E-514. This test includes exposing the concrete to the equivalent of 62 mph wind force and 5 ½ inches of rain per hour. For a wall system to pass this there should be no water that passes through the system.
http://www.safecrete.com/astmreports.htm
There are certain conditions that have to be followed in order for a building to achieve functional thermal performance. The main purpose of this is to ensure that the mortar joints of the aerated concrete masonry units do not crack and weaken the system. More information about the specific conditions to be followed for thermal performance can be found at:
http://www.imperiabros.com/AACSECTION_03440.htm
http://www.aacstructures.com/fire.html
Fire resistance for aerated concrete masonry units far exceeds the set ASTM E-119 fire rating. They can last up to 2900º F before they begin to melt, which is more than twice the typical temperature in a building fire of1200º F.
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