Comparison of conventional and self-consolidating concrete for drilled shaft construction.

Details

• Creators:
  Rupnow, Tyson ; Icenogle, Patrick
• Corporate Creators:
  Louisiana Transportation Research Center
• Corporate Contributors:
  Louisiana. Dept. of Transportation and Development ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Self compacting concrete
  • Underwater construction
  • Bridge construction
  • Shaft sinking
  • Electrical resistivity
  • Modulus of elasticity
  • Viscosity
  • Workability
  • Strength of materials
  • Alternatives analysis
• Publication/ Report Number:
  FHWA/LA.14/533
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  Many entities currently use self-consolidating concrete (SCC), especially for drilled shaft construction. This project investigated the use of SCC ; and various test methods to assess the suitability of SCC in underwater placement conditions. Eight mixtures were prepared in the laboratory; the ; fresh properties of slump-flow, J-ring, set time, and washout characteristics were measured. Hardened properties tested included compressive and ; flexural strength, modulus of elasticity, and surface resistivity. ; The fresh concrete results of SCC showed that SCC produced with a No. 8 crushed stone or No. 8 gravel is adequate in terms of workability and ; strength with the use of a high range water reducer. The L-box test results were varied across all mixtures and the method was abandoned in favor ; of the washout test. The washout test results showed that for SCC mixtures being placed in an underwater condition, the addition of a VMA ; greatly enhances the resistance of said concrete to washout. ; Compressive and flexural strengths showed that SCC will be adequate for nearly all structural concrete and drilled shaft applications. The ; modulus of elasticity values for mixtures tested were slightly increased compared to traditional concrete values showing that the SCC mixtures are ; particularly suited for drilled shaft construction. ; Surface resistivity values were slightly depressed for laboratory mixtures at 28-days of age, but field cast SCC mixtures will incorporate, not only ; additional SCMs but a greater proportion of SCMs, leading to increased resistivity values to meet the specification. ; Field construction results showed that the mixture was resistant to washout, exhibited excellent workability properties, and had excellent strength ; characteristics. ; The authors recommend incorporating SCC into the standards and specifications for Departmental use. At a minimum, Sections VIII and IV ; should be amended to include appropriate language allowing the use of said mixtures. The use of SCC in an underwater placement condition ; should require the use of a viscosity modifier.
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• Format:
  PDF
• Funding:
  LTRC Project Number: 12-5C;State Project Number: 30000681
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28833/dot_28833_DS1.pdf
• File Type:
  [PDF - 1.43 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:d4eee6edf43e8662b2c2cb4d3d2d437096fc15bb5d47ebf4662c01bbbc02e1fbd58caa89cec99bd9260c90cc8b79ab82a9df9aafd3447879a63337fa9c84bf92