Mechanical Properties of Unbonded Prestressed Recycled Coarse Aggregate Concrete Beam(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2016年01期
- Page:
- 30-37
- Research Field:
- Publishing date:
Info
- Title:
- Mechanical Properties of Unbonded Prestressed Recycled Coarse Aggregate Concrete Beam
- Author(s):
- CHENG Dong-hui; YU Yong-zhi; DONG Zhi-peng
- School of Civil Engineering, Northeast Forestry University
- Keywords:
- recycled coarse aggregate concrete; replacement rate; mechanical property; ultimate bearing capacity; prestressed bar
- PACS:
- -
- DOI:
- -
- Abstract:
- Five test beams of unbonded prestressed recycled coarse aggregate concrete with different replacement rates were designed and made. Then flexural performance tests of normal section were completed through two-point load. The mechanical properties, such as failure mode, bearing capacity, crack width and middeflection and so on, were studied. Coordinated with Code for Design of Concrete Structures(GB 50010—2010), the calculation formulas of stress increment of prestressed bar for unbonded prestressed recycled coarse aggregate concrete beam were build based on test data. Meanwhile, the suggestions of maximum crack width and stiffness for unbonded prestressed recycled coarse aggregate concrete beam were put forward.The results show that the replacement rate of recycled coarse aggregate has non-significant influence on failure mode, crack width and mid-span deflection. Compared with unbonded prestressed concrete beam, the stress increment of unbonded prestressed bar for unbonded prestressed recycled coarse aggregate beam is larger, but replacement rate of recycled coarse aggregate has non-significant influence on stress increment of unbonded prestressed bar.
Last Update: 2016-01-29