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Nanoindentation technique was adopted to investigate the chemomechanical properties change of hardened cement paste before and after carbonation.It was found that the mean elastic modulus and mean hardness obviously increase after the carbonation reaction.Specifically,the probability of the elastic modulus showed a sharp reduction for the elastic modulus at the range of 7-34 and 83-160 GPa,in comparison of a large increase for the elastic modulus between 34-83 GPa.For the same reason,the probability of the hardness showed a large decrease when the hardness fell within 0.15-1.75 and 4.15-8.20 GPa and a dramatic increase for the hardness at the range of 1.75-4.15 GPa.In addition,low density C-S-H was affected by the carbonation degradation more seriously than high density C-S-H.The carbonation reaction led to distinct decrease of the number and size of unhydrated cement paste particles.
Nanoindentation technique was adopted to investigate the chemomechanical properties of hardened cement paste before and after carbonation. It was found that the mean elastic modulus and mean hardness obviously increased after the carbonation reaction. Specifically, the probability of the elastic modulus showed a sharp reduction for the elastic modulus at the range of 7-34 and 83-160 GPa, in comparison to a large increase for the elastic modulus between 34-83 GPa. For the same reason, the probability of the hardness showed a large decrease when the hardness fell within 0.15-1.75 and 4.15-8.20 GPa and a dramatic increase for the hardness at the range of 1.75-4.15 GPa. addition, low density CSH was affected by the carbonation degradation more seriously than high density CSH.The carbonation reaction led to distinct decrease of the number and size of unhydrated cement paste particles.