SELF-CONSOLIDATING CONCRETE (SCC) STRUCTURAL INVESTIGATION

Self-consolidating concrete (SCC) is a relatively new approach to making concrete and is characterized by its high flowability and resistance to aggregate segregation in the plastic state. SCC has become a popular alternative for commercial precast elements in Florida. In response to the producer's requests to use SCC, Florida Department of Transportation (FDOT) initiated a study in which full-scale precast, pretensioned AASHTO Type II beams were constructed and tested. SCC trial mix designs were developed in conjunction with the participating precast producer. These trial mixes included extensive plastic property testing of the SCC trial mixes. Three beams were constructed using SCC, and three using a conventional FDOT approved mix. The major tasks included performing plastic and hardened property tests, constructing SCC beams without vibrating, determining the prestress transfer length, monitoring the camber, and finally testing the beams in such a manner as to produce flexure and shear dominated failure modes. No notable differences were found in prestress transfer length, mean camber growth, flexural capacity, shear capacity, or observed web cracking (during load testing) between the SCC and standard beams. One exception was the fully bonded strand slip in shear-slip test two, which resulted in a 15% lower ultimate capacity for SCC. It is believed that, based on the transfer length measurements, the abrupt prestress transfer conditions may have contributed to the early slip. Total deflections measured during the load tests indicated that the standard mix had slightly better ductility than SCC with the standard beams reaching an average of 17.1% more deflection than the SCC beams at the ultimate load.

Language

  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 117 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00989312
  • Record Type: Publication
  • Report/Paper Numbers: Report No. 49104504047,, UF Project No. 455404712,, Final Report
  • Contract Numbers: BD545, RPWO #21
  • Files: TRIS, STATEDOT
  • Created Date: Apr 27 2005 12:00AM