The modification effects of a nano-silica slurry on microstructure, strength, and strain development of recycled aggregate concrete applied in an enlarged structural test

Hongru Zhang, Yuxi Zhao*, Tao Meng, Surendra P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

109 Scopus citations

Abstract

The modification effects of a nano-silica slurry on properties of recycled aggregate concrete (RAC) were experimentally studied. Together with natural aggregate concrete (NAC), non-modified and modified RAC were applied in three beams in a real project. The beneficial effects of the nano-silica slurry on RAC's mechanical properties were certificated. In situ strain monitoring in the target beams showed the improved resistance to cracking of RAC after modification. Nanoindentation tests proved that the nano-silica slurry enhanced the new interface transition zone (ITZ) between the old and new mortars in RAC, and surface-strengthened the old mortar, while the old ITZ between old aggregate was not strengthened.

Original languageEnglish (US)
Pages (from-to)721-735
Number of pages15
JournalConstruction and Building Materials
Volume95
DOIs
StatePublished - Jul 31 2015

Keywords

  • In situ concrete strain
  • Nano-silica
  • Nanoindentation
  • Recycled aggregate concrete (RAC)

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science

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