Improvement in corrosion resistance of recycled aggregate concrete by nano silica suspension modification on recycled aggregates

Weilai Zeng, Yuxi Zhao, Haibing Zheng, Chi sun Poon

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)


This work modified recycled aggregates (RAs) by soaking them in a nano-silica (NS) suspension and evaluated the modification effects on recycled aggregate concrete (RAC). Firstly, different soaking times were studied based on the surface microhardness and the penetration depth of NS particles in the RA. Secondly, mechanical properties (e.g., compressive strength and microhardness of interfacial transition zones) and durability properties (e.g., steel corrosion and corrosion-induced cracking) were tested. The 1-h soaking modification was selected as the optimal soaking time. The nano-modification improved the protection of steel and the resistance to corrosion-induced cracking, which was believed to be related to the improvement of the ITZ properties according to the microhardness test results.

Original languageEnglish
Article number103476
JournalCement and Concrete Composites
Publication statusPublished - Feb 2020


  • Corrosion
  • Cracks
  • Interfacial transition zone
  • Nano-modification
  • Recycled aggregate concrete

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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