Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (4): 1162-1168.doi: 10.13229/j.cnki.jdxbgxb20171296

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Effect of carbonation on nitrite ion distribution in cement paste

Xiao⁃zhen LI(),Jun⁃zhe LIU(),Yan⁃hua DAI,Zhi⁃min HE,Ming⁃fang BA,Yu⁃shun LI   

  1. College of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China
  • Received:2017-12-31 Online:2019-07-01 Published:2019-07-16
  • Contact: Jun?zhe LIU E-mail:lixiaozhen01@126.com;junzheliu@163.com

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Abstract:

The influence of carbonization on the distribution of nitrite ions in hardened cement paste is verified by electron probe microanalysis (EPMA) and X-ray diffraction (XRD), and the migration and adsorption of free nitrite ions in cement paste is clarified, which is important to accurately evaluates the corrosion-resistant effect of nitrite ion on reinforced concrete. The results reveal that a new hydrated crystallization phase NO2?AFm is produced after the hydration of nitrite-containing cement paste and is evenly distributed. During the carbonation process, NO2?AFm re-decomposes and generates nitrite ions, diffusing to non-carbonized area. This results in a decrease of NO2?content in carbonized area and an increase in non-carbonized area. Nevertheless, due to the decomposition of C?S?H gel during the carbonization process, the free nitrite ions adsorbed on its surface are re?transformed into free nitrite ion, increasing the content of free nitrite in the carbonization area. Meanwhile, the migration of silicon from carbonized area into non?carbonized area, contributes to a higher amorphous content of C?S?H gel in non-carbonized area, which increases the solidified effect of nitrite ion, and eventually leads to a higher nitrite ion content in carbonized area than that in non-carbonized area.

Key words: road engineering, cement paste, carbonation, nitrite ion, electron probe microanalysis(EPMA), NO2?AFm

CLC Number: 

  • TQ172

Fig.1

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Fig.2

Distribution of free nitrite ion after carbonation"

Fig.3

XRD patterns of cement paste containing nitrite"

Fig.4

Distribution of Si elements after carbonation"

Fig.5

XRD patterns of cement paste containing nitrite after carbonation"

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