How Rheology Governs Dynamic Segregation of Self-Consolidating Concrete
Self-consolidating concrete (SCC) is designed to fill any type of formwork and spread into place by its own weight in the absence of mechanical vibration. Due to the high flowability of SCC, it is more susceptible to suffer stability problems compared to conventional vibrated concrete. Dynamic segregation refers to segregation in concrete while being cast into a formwork or due to an impact or drop. In this paper, the main purpose is to understand how rheology governs dynamic segregation of SCC, explaining the effect of different mixture design parameters, by using the tilting box (T-box). Changes in admixture contents, paste volume, aggregate distribution, water-cementitious materials ratio (w/cm), and the width of the T-box have been investigated. The results show that dynamic segregation of SCC is dependent on the paste volume, the grain size distribution, fly ash content, and the width of the formwork, in addition to the rheological properties of the concrete.
A. M. Ley-Hernandez and D. Feys, "How Rheology Governs Dynamic Segregation of Self-Consolidating Concrete," ACI Materials Journal, vol. 116, no. 3, pp. 131-140, American Concrete Institute (ACI), Mar 2019.
The definitive version is available at https://doi.org/10.14359/51714507
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Dynamic segregation; Mixture design; Rheology; Self-consolidating concrete; Workability
International Standard Serial Number (ISSN)
Article - Journal
© 2019 American Concrete Institute (ACI), All rights reserved.
01 Mar 2019