Open Access
Corrected Proof DETERMINATION OF THE RHEOLOGICAL PARAMETERS OF SELF-COMPACTING CONCRETE MATRIX USING SLUMP FLOW TEST
Marina Neophytou,Stella Pourgouri,Antonios Kanellopoulos,Michael F. Petrou,Ioannis Ioannou,Georgios C. Georgiou,Andreas N. Alexandrou +6 more
TLDR
In this article, an empirical model relating the yield stress to material and flow parameters is proposed to correlate the rheological parameters of SCC matrix, yield stress and plastic viscosity, to slump flow measurements.Abstract:
The classification of a concrete mixture as self-compacting (SCC) is performed by a series of empirical characterization tests that have been designed to assess not only the flowability of the mixture but also its segregation resistance and filling ability. The objective of the present work is to correlate the rheological parameters of SCC matrix, yield stress and plastic viscosity, to slump flow measurements. The focus of the slump flow test investigation was centered on the fully yielded flow regime and an empirical model relating the yield stress to material and flow parameters is proposed. Our experimental data revealed that the time for a spread of 500 mm which is used in engineering practice as reference for measurement parameters, is an arbitrary choice. Our findings indicate that the non-dimensional final spread is linearly related to the non-dimensional yield-stress. Finally,there are strong indications that the non-dimensional viscosity of the mixture is associated with the non-dimensional final spread as well as the stopping time of the slump flow; this experimental data set suggests an exponential decay of the final spread and stopping time with viscosity.read more
Citations
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State of art review on self compacting concrete using mineral admixtures
TL;DR: In this paper, the authors have shown scientific basis for potential design of self compacting concrete (SCC) materials for concrete structures, which is able to compact itself without any additional vibration.
Journal ArticleDOI
Assessing the quality of concrete – reinforcement interface in Self Compacting Concrete
Antonios Kanellopoulos,Pericles Savva,Michael F. Petrou,Ioannis Ioannou,Stavroula J. Pantazopoulou +4 more
TL;DR: In this article, the authors present an experimental methodology for assessing the quality of the interface between self-compacting concrete and ribbed reinforcement by using Digital Image Analysis of cut sections containing reinforcing bars at different cast-heights.
Journal ArticleDOI
Mechanical behaviour of self compacting concrete: Effect of wood ash and coal ash as partial cement replacement
TL;DR: In this paper, the authors developed self-consolidating concrete (SCC) with locally available waste materials i.e. coal ash and wood ash, and optimized the percentage partial cement replacement to achieve strength similar to normal concrete for a particular water-to-cement (w/c) ratio.
References
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A thixotropy model for fresh fluid concretes: Theory, validation and applications
TL;DR: In this article, the methods used to measure and model thixotropy of fresh concrete in the civil engineering field are described and a simple thixotropic model is presented, which is in agreement with the experimental observations that can be found in the literature.
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“Fifty-cent rheometer” for yield stress measurements: From slump to spreading flow
Nicolas Roussel,Philippe Coussot +1 more
TL;DR: In this article, the authors extend the theoretical analysis of the slump test by including different flow regimes according to the ratio between the radius (R) and the height (H) of the slumped cone.
Journal Article
Self-Compacting High-Performance Concrete
TL;DR: In this article, a self-compact concrete is defined as follows at the three stages of concrete: (1) Fresh: selfcompactable; (2) Early age: avoidance of initial defects; (3) After hardening: protection against external factors.
Journal ArticleDOI
From mini-cone test to Abrams cone test: measurement of cement-based materials yield stress using slump tests
TL;DR: In this article, the flow induced by a smaller cone test for cement pastes and grouts is studied and a modified relation allows the prediction of the plastic yield value from the measured spread.
Journal ArticleDOI
Fresh concrete: A Herschel-Bulkley material
TL;DR: In this article, preliminary results of an experimental program on the rheological behavior of fresh concrete are presented, and it appears that the relationship between torque and rotation speed is not exactly linear.
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