Carbonation degree of autoclaved aerated concrete

Neutralization depth has been the criterion in the carbonation or neutralization of ordinary concrete. On the other hand, autoclaved aerated concrete (AAC) has been investigated in terms of the carbonation degree. However, various definitions of carbonation degree of AAC have been proposed and applied. We have studied the definition of carbonation degree of AAC in order to investigate various research works under the same criterion. In this paper, we propose the carbonation degree (D-c) of AAC, D-c (%) = (C-C-o)/(C-max-C-o)x100 where C, C-o and C-max are the amount of carbon dioxide in the sample, in the non-carbonated sample and the theoretical amount of carbon dioxide needed to combine with the total calcium oxide in the sample to form calcium carbonate, respectively. In addition, we propose the heating weight loss from 600 degreesC to 800 degreesC in TG-DTA analyses as the method to determine the amount of carbon dioxide for carbonation degree of AAC. (C) 2000 Elsevier Science Ltd. All rights reserved.