The Rheological Properties of Ternary Binders Containing Portland Cement, Limestone, and Metakaolin or Fly Ash

Abstract

The influence of limestone particle size and the type and extent of (partial) cement replacement on the yield stress and plastic viscosity of ternary pastes are studied. Interpretations based on Bingham model indicate: (i) for binary/ternary blends containing coarse limestone, the yield stress and plastic viscosity remain unchanged or decrease with increasing cement replacement, (ii) in ternary blends, plastic viscosity increases with the fine limestone content, and (iii) the yield stress in ternary blends containing fly ash is dependent on the limestone content and fineness whereas in blends containing metakaolin, the yield stress reduces with an increase in limestone content, irrespective of the limestone particle size. These are attributed to: particle packing, water demand, and the interparticle spacing and contacts which are quantified using microstructural simulations. The yield stress and plastic viscosity show strong direct correlations to the specific surface area and inverse correlations to the water film thickness.

Department(s)

Materials Science and Engineering

Comments

The authors gratefully acknowledge the National Science Foundation (CMMI 1068985), Arizona State University (ASU), and the University of California, Los Angeles (UCLA) for support of this research.

Keywords and Phrases

Fly ash (D); Limestone; Metakaolin (D); Particle size distribution (B); Rheology (A)

International Standard Serial Number (ISSN)

0008-8846

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2013 Elsevier Ltd, All rights reserved.

Publication Date

01 Oct 2013

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