The influence of multi-walled carbon nanotubes additive on properties of non-autoclaved and autoclaved aerated concretes

The influence of multi-walled carbon nanotubes (MWCNTs) additive on characteristics of non-autoclaved aerated concrete (NAC) and autoclaved aerated concrete (AAC) was investigated. It was established that MWCNTs used as additive in NAC and in AAC production process acts as nucleators of crystallization influencing the hydration process and structure formation leading to increase in crystallinity of hardened binding material, as well as to increase in flexural and compressive strength of concretes and decrease in shrinkage during heating. The influence of MWCNTs on characteristics of AAC is more significant than on the characteristics of NAC. Investigation results allow to premise that NAC and as well AAC containing MWCNTs additive should be more stable during exploitation than those concretes without this additive.