Performance of the chloride ions transport in recycled concrete via salt-freezing coupling
1
School of Civil & Water Conservancy Engineering, Ningxia University, Yinchuan, Ningxia 750021, PR China
2
Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions, Ministry of Education, Yinchuan, Ningxia 750021, PR China
3
Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering, Yinchuan, Ningxia 750021, PR China
4
Engineering Technology Research Center of Water-Saving and Water Resource Regulation in Ningxia, Yinchuan, Ningxia 750021, PR China
Submission date: 2023-07-19
Final revision date: 2023-09-12
Acceptance date: 2025-01-06
Publication date: 2025-01-28
Cement Wapno Beton 29(4) 265-284 (2024)
KEYWORDS
TOPICS
ABSTRACT
Salt-freezing coupling is one of the main factors affecting the durability of recycled concrete. Investigating the chloride ion transport performance in recycled concrete containing recycled aggregate is essential to clarify the resistance of recycled concrete to chloride ion erosion due to the use of recycled aggregate produced from waste concrete. The objective of this paper is to investigate the migration behaviors and binding characteristics of chloride ions in recycled concrete, which were exposed to the salt-freezing coupling environment. The microstructure of the recycled concrete was conducted through scanning electron microscope (SEM), while the process of chloride ions migration was simulated by COMSOL software. The results indicated that the degree of recycled concrete, prepared by recycled coarse aggregate [RCA]and different particle size fly ash [NF], frost damage was higher in a 3 % NaCl solution compared to water. The contents of free chloride ions in recycled concrete subjected to freezing-thawing [F-T] cycle in water was minimally influenced by the NF content or the replacement rate of RCA. Under F-T conditions in a 3 % NaCl solution, increasing the NF content at the same replacement rate of RCA results in a decreasing-then-increasing trend in both the free chloride ion content and the chloride ion binding capacity in the concrete. Recycled concrete containing 15 % NF had a superior salt frost resistance compared to recycled concrete without NF or with ultrafine fly ash [SF]. With the replacement rates of RCA increasing, the contents of free chloride ions rose, the salt resistance of recycled concrete decreased. Using Fick’s second law, the chloride ion diffusion coefficient was calculated using MATLAB, and COMSOL software simulation accurately portrayed the diffusion state of free chloride ions in the recycled concrete.
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