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Application of nanoindentation to investigate chemomechanical properties change of cement paste in the carbonation reaction

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Abstract

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.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China

    JianDe Han, GangHua Pan, Wei Sun, CaiHui Wang & Dong Cui

  2. Jiangsu Key Lab of Construction Material, Nanjing, 211189, China

    JianDe Han, GangHua Pan, Wei Sun, CaiHui Wang & Dong Cui

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  1. JianDe Han
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  2. GangHua Pan
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  3. Wei Sun
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  4. CaiHui Wang
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  5. Dong Cui
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Correspondence to JianDe Han.

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Han, J., Pan, G., Sun, W. et al. Application of nanoindentation to investigate chemomechanical properties change of cement paste in the carbonation reaction. Sci. China Technol. Sci. 55, 616–622 (2012). https://doi.org/10.1007/s11431-011-4571-1

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  • DOI: https://doi.org/10.1007/s11431-011-4571-1

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