TY - JOUR
T1 - Unlocking the role of pores in chloride permeability of recycled concrete
T2 - A multiscale and a statistical investigation
AU - Lian, Songsong
AU - Ruan, SQ
AU - Zhan, Shulin
AU - Unluer, C
AU - Meng, Tao
AU - Qian, KL
N1 - Funding Information:
The authors gratefully acknowledge the support from Zhejiang Provincial Key Laboratory of Marine Geotechnical Engineering and Materials. Financial support from State Key Laboratory of Solid Waste Reuse for Building Materials (SWR-2021-004) and State Key Laboratory of Clean Energy Utilization , Zhejiang University ( 109203*A62103/027 ) is also acknowledged.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/1
Y1 - 2022/1
N2 - Chloride ingress is strongly associated with the properties of pores in recycled concrete. To unlock its role in chloride permeability, the pore structures of concrete containing various quantities of recycled coarse (fine) aggregates were analyzed from multi-scales, and the outcomes were further verified by the statistical investigation. The results show that different roles that recycled coarse (fine) played in terms of the pore structures of recycled concrete, as reflected by their volume and diameter of mesopores and micropores, respectively. Meanwhile, Unlike the previous studies, two key pore parameters (i.e., P V < 1 and P T) were put forward, revealing their strong interconnections with chloride diffusion of recycled concrete, as confirmed by the statistical analysis. Further, a model concerning chloride permeability of recycled concrete was proposed on a basis of the probability theory, and the newly proposed factor Rp (relied on the previous two pore parameters) has a great relevance to effective chloride diffusion. Therefore, this work enhances accuracy of prediction for chloride diffusivity and durability associated with recycled concrete.
AB - Chloride ingress is strongly associated with the properties of pores in recycled concrete. To unlock its role in chloride permeability, the pore structures of concrete containing various quantities of recycled coarse (fine) aggregates were analyzed from multi-scales, and the outcomes were further verified by the statistical investigation. The results show that different roles that recycled coarse (fine) played in terms of the pore structures of recycled concrete, as reflected by their volume and diameter of mesopores and micropores, respectively. Meanwhile, Unlike the previous studies, two key pore parameters (i.e., P V < 1 and P T) were put forward, revealing their strong interconnections with chloride diffusion of recycled concrete, as confirmed by the statistical analysis. Further, a model concerning chloride permeability of recycled concrete was proposed on a basis of the probability theory, and the newly proposed factor Rp (relied on the previous two pore parameters) has a great relevance to effective chloride diffusion. Therefore, this work enhances accuracy of prediction for chloride diffusivity and durability associated with recycled concrete.
KW - chloride penetration
KW - correlation analysis
KW - pore structure analysis
KW - recycled concrete
KW - X-ray computed tomography
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UR - https://www.mendeley.com/catalogue/eb5e67f5-77a3-30a2-b7f9-434245f4eb1b/
U2 - 10.1016/j.cemconcomp.2021.104320
DO - 10.1016/j.cemconcomp.2021.104320
M3 - Article
SN - 0958-9465
VL - 125
SP - 1
EP - 17
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 104320
ER -