Statistical design to evaluate the coupled effect of mixture parameters and rebar spacing on flow characteristics of SCC

Title: Statistical design to evaluate the coupled effect of mixture parameters and rebar spacing on flow characteristics of SCC
Author(s): Ammar Yahia, Kamal Khayat, Mohammed Sayed
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 11
Language: English

Abstract: Self-consolidating concrete (SCC) is designed to exhibit high deformability and moderate viscosity to maintain homogenous suspension of coarse particles in the mortar during flow. Proper deformability and uniform suspension of coarse aggregate particles in the matrix are key parameters to ensure successful casting and adequate performance. Deformability characteristics and flow properties of fresh concrete are related to rheological properties of the mixture, aggregate volume and characteristics, as well as to the level of reinforcement required.
The mixture proportioning of SCC involves tailoring several parameters to achieve adequate stability to avoid arching of solid particles and blockage at the vicinity of obstacles, thus resulting in proper flow characteristics and passing ability. The optimization of SCC often necessitates several trial batches before striking optimal balance among the various mixture parameters that affect rheological properties, stability, mechanical properties, and durability of the SCC.
The objective of this study is to evaluate the effect of relevant mixture parameters and the density of reinforcement on flow characteristics of SCC using a statistical design approach. This study seeks to model the effect of the content of supplementary cementitious materials (SCM), coarse aggregate volume (CA), and density of reinforcement on flowability, passing ability, and filling capacity of SCC. The derived models indicate that the flow rate of SCC in the presence of reinforcement is dominated by the content of SCM and clear spacing between the reinforcement. The comparison between predicted and measured responses indicates the accuracy of the established models to describe the effect of the independent variables on the flow behavior of SCC through restricted sections.

Online publication: 2006-08-02
Classification: 3.2 Theme 2: From Fresh to Hardened Concrete
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.083