Carbonation Reaction and Microstructural Changes of Metro-Tunnel Segment Concrete Coupled with Static and Fatigue Load
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 2
Abstract
Carbonation problems relating to concrete durability cannot correspond to the real engineering service environment, because the degradation of concrete properties is actually affected by load and multiple environment factors for a coupling effect. This paper studies the chemical reaction mechanism, carbonation depth, pH values, and pore-structure changes under a load and carbonation coupling effect. The authors study the time-dependent evolution of carbonation depth under different levels of tensile and compressive loads. The authors then further study the time-dependent evolution of concrete carbonation depth under fatigue bending loads at different stresses levels and cycles. While taking advantage of the microstructure characterization methods, X-ray diffraction (XRD), mercury intrusion porosimetry (MIP) and a pH-value meter were used to analyze the chemical reaction mechanism of the concrete carbonation process, undertake a quantitative analysis of the solid phase composition, and examine the evolution of the pore structure.
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Acknowledgments
The author’s research visit to Ghent University was supported by the China Scholarship Council. This work is supported by a grant from the Major State Basic Research Development Program of People’s Republic of China (The 973 Project) (No. 2011CB013801) and the National Natural Science Foundation of China (No. 51308290), and major projects of Natural Science Foundation of Jiangsu Province (No. 14KJA560001), and Industry-Academic-Research Prospective Joint Research Project in Jiangsu Province (No. BY2014005-05).
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 2 • February 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Nov 25, 2015
Accepted: Jul 6, 2016
Published online: Sep 7, 2016
Published in print: Feb 1, 2017
Discussion open until: Feb 7, 2017
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