Influence of mixing procedure on robustness of self-consolidating concrete.

Details

• Creators:
  Feys, Dimitri ; Asghari, Azadeh ; Ghafari, Ehsan ; Hernandez, Aida Margarita Ley ; Van Der Vurst, Farid ; De Schutter, Geert
• Corporate Creators:
  Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety
• Corporate Contributors:
  United States. Dept. of Transportation. Research and Innovative Technology Administration
• Subject/TRT Terms:
  • Self compacting concrete
  • Concrete mixing
  • Procedures
  • Cement paste
  • Mix design
  • Quality control
  • Moisture content
  • Rheological properties
  • Thixotropy
  • Workability
• Publication/ Report Number:
  NUTC R333 ; Project #00042242
• Resource Type:
  Tech Report
• Geographical Coverage:
  Missouri
• Corporate Publisher:
  Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety
• Abstract:
  Self-Consolidating Concrete is, in the fresh state, more sensitive to small variations in the constituent elements and the mixing ; procedure compared to Conventional Vibrated Concrete. Several studies have been performed recently to identify robustness of SCC ; and to develop solutions to increase the robustness of SCC. Ghent University obtained a major research project from the Research ; Foundation in Flanders (FWO) to investigate fundamentally robustness of SCC and to identify potential solutions in the form of ; alternative materials to enhance robustness. ; In the present research project, Missouri S&T extended the research at Ghent University by investigating the influence of the mixing ; procedure on the robustness of SCC. The project was split into four tasks. In a first task, the sequence of adding the constituent ; elements and mixing was investigated by measuring the rheological properties of cement pastes. In a second task, the combined ; influence of the most significant mix design and mixing procedure parameters were investigated, with particular attention to the mix ; design parameters which influence the robustness of the cement paste to a change in time of addition of the superplasticizer. In the ; third task, the results obtained on cement pastes were validated on concrete scale, with focus on the adding sequence of the aggregates ; and their initial moisture content. In the fourth task, the robustness of thixotropy and loss of workability was investigated on cement ; paste and concrete scale. ; To enhance the application of SCC for the construction and repair of transportation infrastructure, two key concepts are of importance: ; quality control and consistency. The consistency refers to the mixing operations and transportation of SCC. It is recommended to keep ; the mixing procedure constant for every SCC produced. This includes the addition sequence of the materials, the mixing time, the ; mixing speed and the concrete volume (parameter not tested, but it is reflected in mixing energy). The quality control is not only ; necessary to determine the moisture content of the aggregates, but also for any of the other constituent elements used.
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• Format:
  PDF
• Funding:
  DTRT06-G-0014
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27962/dot_27962_DS1.pdf
• File Type:
  [PDF - 1.23 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:01525694836901a7049e2fba8a9298ecebba7858cb068e38c95bab3045997cad