Abstract
A 100 mm-diameter split Hopkinson pressure bar (SHPB) was used 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 to be affected by nanoparticles dosages and impact velocities. Compared to NC, NS is more effective in improving dynamic compressive strengths of RAC.
| Original language | English (US) |
|---|---|
| Pages | 3984-3992 |
| Number of pages | 9 |
| State | Published - 2019 |
| Event | 5th fib Congress, FIB 2018 - Melbourne, Australia Duration: Oct 7 2018 → Oct 11 2018 |
Conference
| Conference | 5th fib Congress, FIB 2018 |
|---|---|
| Country/Territory | Australia |
| City | Melbourne |
| Period | 10/7/18 → 10/11/18 |
Keywords
- Impact behaviours
- Nanoparticles
- Recycled aggregate concrete (RAC)
- Split Hopkinson pressure bar (SHPB)
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction