Title

How Rheology Governs Dynamic Segregation of Self-Consolidating Concrete

Abstract

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.

Department(s)

Civil, Architectural and Environmental Engineering

Comments

The authors would like to acknowledge the RE-CAST US-DOT Tier-1 University Transportation Center at Missouri S&T (Grant DTRT13-G-UTC45) for the financial support.

Keywords and Phrases

Dynamic segregation; Mixture design; Rheology; Self-consolidating concrete; Workability

International Standard Serial Number (ISSN)

0889-325X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 American Concrete Institute (ACI), All rights reserved.

Publication Date

01 Mar 2019

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