Abstract
Self-consolidating concrete (SCC) is designed to exhibit high deformability and stability to maintain homogenous suspension of coarse aggregate particles in the mortar during flow to ensure adequate passing ability of the concrete through restricted areas and the filling of the formwork without any consolidation. Proper deformability and uniform suspension of coarse aggregate particles in the matrix are key parameters to ensure successful casting and adequate in situ performance. the required flow properties of concrete are affected by the rheological properties of the mixture and the characteristics of the cast element, including the level of reinforcement. the mixture proportioning of SCC involves tailoring several mixture parameters to achieve adequate stability and reduce the risk of arching of solid particles and blockage at the vicinity of closely spaced obstacles which is required to ensure proper passing ability and flow characteristics. the objective of this study is to evaluate the coupled effect of mixture parameters and density of reinforcement on flow characteristics of SCC using a statistical design approach. This study seeks to model the coupled effect of the content of supplementary cementitious materials (SCMs), coarse aggregate volume (CA), and density of reinforcement on flowability, passing ability, and filling capacity of SCC. the comparison between predicted and measured responses determined on eight mixtures indicates the accuracy of the established models to describe the effect of the independent variables on the flow behavior of SCC through restricted sections. the derived models show that the flow rate of SCC in the presence of reinforcement is dominated by the content of SCM and clear spacing between the reinforcement. on the other hand, the SCM content is shown to have a three-time greater effect on plastic viscosity than the relative volume of coarse aggregate. Trade-offs between rheological parameters, clear spacing, and flow of SCC in the presence of obstacles showed that for a given clear spacing, higher viscosity and lower yield stress values resulted in higher flow time of concrete. for clear spacing between obstacles of 30 mm, SCC mixtures with plastic viscosity lower than 50 Pa s and yield stress of 45 Pa are shown to ensure proper passing ability. © 2012 Elsevier Ltd. All rights reserved.
Recommended Citation
Y. Ammar et al., "Statistical Modelling of the Coupled Effect of Mix Design and Rebar Spacing on Restricted Flow Characteristics of SCC," Construction and Building Materials, vol. 37, pp. 699 - 706, Elsevier, Dec 2012.
The definitive version is available at https://doi.org/10.1016/j.conbuildmat.2012.04.072
Department(s)
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Filling ability; Restricted flow; Rheology; Self-consolidating concrete; Statistical design
International Standard Serial Number (ISSN)
0950-0618
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
01 Dec 2012
