Flexural Toughness and Fracture Properties of Ecological Steel Fiber Reinforced Concrete(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2017年02期
- Page:
- 111-118
- Research Field:
- Publishing date:
Info
- Title:
- Flexural Toughness and Fracture Properties of Ecological Steel Fiber Reinforced Concrete
- Author(s):
- DENG Zong-cai; WANG Hui; LIU Yan
- College of Architecture Civil Engineering, Beijing University of Technology
- Keywords:
- ecological steel fiber reinforced concrete; native high strength steel fiber reinforced concrete; flexural toughness; fracture toughness; volume fraction
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to grasp the flexural toughness and fracture property of ecological steel fiber reinforced concrete, fourpoint bending toughness test for beam and threepoint bending fracture test for notched beam were carried out with different volume fractions of ecological steel fibers 1.0%, 1.7%,2.4% and different volume fractions of native high strength steel fibers 0.7%, 1.3%. The results show that when the volume fraction of ecological steel fiber is 1.0%, fourpoint bending loaddeflection curves of beam and threepoint bending loaddeflection curves and loadcrack mouth opening displacement curves of notched beam are partial steep drop after the peak point, residual strength and fracture toughness are low.Ecological steel fibers have less improvement on toughness and fracture properties. When the volume fraction of ecological steel fiber is 1.7%, the flexural toughness and fracture property of concrete are greatly improved,concretes still have high toughness when the deformation is 15δult,p(δult,p?is deflection corresponding to peak load of plain concrete) and 70Dult,p（Dult,p?is peak crack mouth opening displacement corresponding to peak load of plain concrete）, fracture energy and fracture toughness of wavy ecological steel fiber concrete are 27.59 times and 8.35 times to plain concrete. When the volume fraction of ecological steel fiber is 2.4%, flexural toughness index, fracture energy and fracture toughness further increase. The toughening and fracture resistance effects of 1.7% volume fraction of ecological steel fiber are almost close to those of 0.7% native high strength steel fiber.
Last Update: 2017-03-30