Effects of nanoparticle on the dynamic behaviors of recycled aggregate concrete under impact loading

Wengui Li*, Zhiyu Luo, Chu Long, Chengqing Wu, Wen Hui Duan, Surendra P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

A 100 mm-diameter split Hopkinson pressure bar (SHPB) was applied to investigate effects of nanoparticles on the dynamic mechanical properties of recycled aggregate concrete (RAC) under impact loading. The nano-SiO2 (NS) and nano-CaCO3 (NC) were incorporated to replace cement by mass of 1 and 2% in RACs. The impact velocities were set as 7.7, 9.8 and 11.6 m/s in the SHPB tests. The effects of nanoparticles on failure patterns, compressive strengths, elastic modulus, peak strain and dynamic increase factor (DIF) of RACs under different strain rates were analyzed and discussed. The results show that nanomodified RACs exhibit higher both quasi-static and dynamic compressive strengths compared to control RAC. Dynamic elastic modulus of RAC seems not be affected by nanoparticle dosages and impact velocities. Compared to NC, NS is more effective to improve dynamic compressive strengths of RAC. On the other hand, the nanoparticles modified RACs exhibit lower DIF values than that of the control RAC. Moreover, NC obviously more reduces the DIF values of nanomodified RAC than NS.

Original languageEnglish (US)
Pages (from-to)58-66
Number of pages9
JournalMaterials and Design
Volume112
DOIs
StatePublished - Dec 15 2016

Keywords

  • Dynamic increase factor (DIF)
  • Impact loading
  • Nanoparticles
  • Recycled aggregate concrete (RAC)
  • Split Hopkinson pressure bar (SHPB)

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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