The combined influence of paste volume and volumetric water-to- powder ratio on robustness of fresh self-compacting concrete

Conference paper (2015)
Department
Structural Engineering (CEG) (TU Delft)
Copyright: © 2015 the authors
Robustness Self-Compacting Concrete Rheoiogy Paste Volume Water-to-Powder ratio
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Published Date

31-12-2015

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Source:

Proceedings of the concrete 2015 conference: 27th biennial national conference of the concrete institute of Australia in conjunction with the 69th RILEM week conference, 1335-1344. (2015)

ISBN:

978-1-943847-70-9

Faculty

Civil Engineering and Geosciences

Department

Structural Engineering

Abstract

In order to avoid durability problems caused by an inadequate consolidation of concrete, self-compacting concrete (SCC) has been developed. The mix design of SCC aims at balancing a minimum flowability allowing air bubbles to escape and a maximum flowability in order to avoid segregation. Because of the higher demands on mix design and additional requirements related to casting, SCC mixtures are in general more sensitive to small variations in its mix composition compared to conventional vibrated concrete. Besides improving the robustness of SCC with admixtures like Viscosity-Modifying Agents (VMAs), it is also important to find out why certain mixtures are more robust than others. This paper investigates the influence of the paste volume and the waterto- powder ratio (volumetric) on the robustness of fresh SCC mixtures. Nine SCC mixtures with a paste volume of 350, 375, and 400 l/m^ and a volumetric water-to-powder ratio of 0.75, 0.90, and 1.05 were subjected to a variation of ±8 l/m^ water. The robustness of the produced mixtures was quantified measuring the slump flow, V-funnel time, L-box ratio, and sieve stability.

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