Efficiencies of carbonation and nano silica treatment methods in enhancing the performance of recycled aggregate concrete

Long Li, Dongxing Xuan, A. O. Sojobi, Songhui Liu, Chi Sun Poon

Research output: Journal article publicationJournal articleAcademic researchpeer-review


This study compared the efficiencies of five recycled aggregate treatment methods (pressurized gas–solid carbonation (PC), flow-through gas–solid carbonation (FC), wet carbonation (WC), nano-silica (NS) spraying and combined PC with NS spraying (PCNS)) in enhancing the performance of recycled aggregate concrete (RAC). Mechanical properties, durability and microhardness of RACs were evaluated. The results showed that PC method recorded higher enhancing efficiency than both FC and WC method. NS spraying method caused higher improvement in mechanical properties of RAC than three carbonation methods. Because of the synergistic effect of enhanced old mortar and new ITZ, PCNS method recorded the highest efficiency.

Original languageEnglish
Article number125080
JournalConstruction and Building Materials
Publication statusPublished - 15 Nov 2021


  • Carbonation
  • Durability
  • Mechanical property
  • Microhardness
  • Nano silica
  • Recycled coarse aggregate

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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