Abstract
In order to study the interfacial bond failure mechanism among three types of steels and recycled aggregate concrete (RAC), a total of 31 steel-RAC short columns were designed to the push-out test, and in this experiment, waste concrete serving over 50 years was used as recycled coarse aggregate. Four changing parameters of steel disposition (cross-section shape), replacement ratio of recycled coarse aggregate, length to diameter ratio and concrete strength grade were considered to research their influences on bond behaviors of steel and RAC. Curves of load-slip at the end of loading and free end were obtained. The influence of each changing parameter on the bond strength was deeply analyzed. The interfacial ultimate bond strength of each specimens was checked by practical bond strength formulas. The formula of interface bonding shear transfer length was deduced. The results show that the starting slip at the loading end developed earlier than the free end. Compared with the ultimate bond strength, the S-RAC's was larger than RAC-FCST's, and RAC-FCST's was larger than RAC-FSST's. The bond strength between steel and RAC was increased slightly as the increasing of recycled coarse aggregate replacement rate. Higher concrete strength was conducive to the improvement of bond strength. It would be decreased that the bond strength of square steel tube and RAC as the larger length to diameter ratio.
| Original language | English |
|---|---|
| Pages (from-to) | 350-363 |
| Number of pages | 14 |
| Journal | Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering |
| Volume | 22 |
| Issue number | 2 |
| DOIs | |
| State | Published - Apr 2014 |
| Externally published | Yes |
Keywords
- Bond strength
- Recycled aggregate concrete (RAC)
- Replacement ratio
- Steel
- Transmission length