Relationship between the particle size and dosage of LDHs and concrete resistance against chloride ingress

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Abstract

The present study investigates the transport properties of cement mortar with Ca-Al-NO3 layered double hydroxides (LDHs). A co-precipitation method is applied to synthesize the Ca-Al-NO3 LDHs and the effect of the synthesis environment on the size and particle shape is studied. The synthesized Ca-Al-NO3 LDHs are analytically characterized by XRD, SEM and FTIR analyses. The relationships between the sizes and addition amount of Ca-Al-NO3 LDHs and the mechanical and transport properties of mortars are investigated. Rapid chloride migration (RCM) tests are performed to the cement mortars with Ca-Al-NO3 LDHs. The results show that permeability of the designed concrete decreased with the addition of Ca-Al-NO3 layered double hydroxides (LDHs). The decrease of chloride migration coefficients can be attributed to the enhanced barrier effect because of the increase of tortuosity. In long-term natural diffusion tests, LDHs present significantly enhanced barrier effect due to the combined chloride binding ability and improved tortuosity.
Original languageEnglish
Pages (from-to)81-90
Number of pages10
JournalCement and Concrete Research
Volume105
DOIs
Publication statusPublished - Mar 2018

Keywords

  • Ca-Al-NO layered double hydroxides
  • Long-term chloride diffusion test
  • Mechanical property
  • Rapid chloride migration
  • Tortuosity
  • Transport property
  • Ca-Al-NO3 layered double hydroxides

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