Reducing the Carbonation Zone and Steel Corrosion Zone Widths of Recycled Aggregate Concrete by Optimizing Its Mixing Process
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 5
Abstract
The optimization of mixing processes is an effective approach for strengthening the microstructure of the interfacial transition zone (ITZ) in recycled aggregate concrete (RAC). This study used iron oxide to distinguish between residual mortar (RM) and added mortar (AM) in RAC using the normal mixing method (NMM), two-stage mixing method (TSMM), and cement paste encapsulating aggregate method (CPEAM). The contents and pH values of the RM and AM of RAC were investigated separately. The carbonation zone and steel corrosion zone widths of RAC were determined separately based on the contents and pH values, and these widths were compared. The results showed that the TSMM and CPEAM decreased the carbonation and steel corrosion zone widths by improving the microstructures of the ITZs and further decreasing the interfacial effect zones in the RM and AM. In addition, the carbonation and steel corrosion zone widths determined using the RM as samples were higher than those using the AM. Consequently, theoretical models for carbonation and steel corrosion zone widths should reflect the effect of the mixing process.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The financial support from the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX18_0081), the Fundamental Research Funds for the Central Universities, the Scientific Research Foundation of Graduate School of Southeast University (YBPY1918), and the National Key Research and Development Program of China (2017YFC0703100) are acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 5 • May 2021
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© 2021 American Society of Civil Engineers.
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Received: May 27, 2020
Accepted: Sep 16, 2020
Published online: Feb 23, 2021
Published in print: May 1, 2021
Discussion open until: Jul 23, 2021
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