Unlocking the role of pores in chloride permeability of recycled concrete: A multiscale and a statistical investigation

Songsong Lian, SQ Ruan, Shulin Zhan, C Unluer, Tao Meng, KL Qian

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number104320
Pages (from-to)1-17
Number of pages17
JournalCement and Concrete Composites
Volume125
Early online date29 Oct 2021
DOIs
Publication statusPublished - Jan 2022

Keywords

  • chloride penetration
  • correlation analysis
  • pore structure analysis
  • recycled concrete
  • X-ray computed tomography

Fingerprint

Dive into the research topics of 'Unlocking the role of pores in chloride permeability of recycled concrete: A multiscale and a statistical investigation'. Together they form a unique fingerprint.

Cite this