A Prediction Model of Semi-Carbonated Zone Length of Concrete Under Natural Exposure Environment

NIU Ditao; ZHANG Binqiang; LIU Jun; LI Xingchen; LIU Xiguang

doi:10.13204/j.gyjzG20100804

Volume 52 Issue 4

Jul. 2022

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NIU Ditao, ZHANG Binqiang, LIU Jun, LI Xingchen, LIU Xiguang. A Prediction Model of Semi-Carbonated Zone Length of Concrete Under Natural Exposure Environment[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(4): 146-151,106. doi: 10.13204/j.gyjzG20100804

Citation:

NIU Ditao, ZHANG Binqiang, LIU Jun, LI Xingchen, LIU Xiguang. A Prediction Model of Semi-Carbonated Zone Length of Concrete Under Natural Exposure Environment[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(4): 146-151,106. doi: 10.13204/j.gyjzG20100804

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A Prediction Model of Semi-Carbonated Zone Length of Concrete Under Natural Exposure Environment

doi: 10.13204/j.gyjzG20100804

1. State Key Laboratory of Green Building in Western China, Xi’an University of Architecture & Technology, Xi’an 710055, China;
2. College of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, China

Received Date: 2020-10-08
Available Online: 2022-07-25

Abstract

Abstract

The paper presented the results of the in-situ test and experimental study on a reinforced concrete industrial plant in Xi'an. The pH values of the pore solution in the cylinder samples were measured layer-by-layer by expression method. The length of semi-carbonated zone was determined according to the test results. The mass balance in the carbonation process was analyzed and the change of substance content in the carbonation process was calculated by numerical method, and the numerical model of semi-carbonated zone length of concrete was obtained. The accuracy of the numerical model was valid by comparing the numerical analysis results with the experimental results. The results showed that the semi-carbonated zone length increased with the increase of water-cement ratio, while decreasing with the increase of cement content and relative humidity. Relative humidity had the most significant effect on the semi-carbonated zone length. When RH ≥ 80%, the semi-carbonated zone disappearred. The semi-carbonated zone length was relatively short at RH = 70%, which could be ignored. The CO₂ concentration and carbonation time had little effect on the semi-carbonated zone length.
- natural exposure,
- expression method,
- pH,
- semi-carbonated zone

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References(21)

References

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