DURABILITY IMPROVEMENT FOR AUTOCLAVED AERATED CONCRETE (AAC) : CARBONATION EVALUATION METHOD FOR AUTOCLAVED AERATED CONCRETE (AAC)

Abstract

The carbonation evaluation method for AAC (Autoclaved Aerated Concrete) was investigated. Cracking, panel bending property, compressive strength and carbonation degree were investigated for field AAC panels aged 4 to 33 years. When the carbonation degree was above 50%, the AAC panels showed cracking and degradation in panel bending property and compressive strength. Therefore, we propose the carbonation evaluation method as follows ; The AAC panel, whose carbonation degree is above 50%, is deteriorated'. With this criteria, surface finished AAC is 1.5 times more durable in carbonation than non-finished AAC. And also, water-repellent AAC has twice as durable in carbonation as normal AAC.