The influence of mineral admixtures on the rheology of cement paste and concrete

By C. Ferraris, K. Obla, R. Hill. 2001

658 citations recorded by the source corpus.

Rheological tests on cement paste were used to successfully select the type and dosage of mineral admixtures that improved concrete workability. Among the six different mineral admixtures tested, the ultrafine fly ash (UFFA) was determined to give the best results by reducing the yield stress and viscosity. These improved rheological properties were not achieved by increasing the water demand and/or the high-range water reducer (HRWR) admixtures dosage. Therefore, the addition of UFFA improved the concrete flow without a potential decrease of the hardened properties or an increase in cost. The conclusions reached based on cement paste tests were validated by concrete slump tests. The cement paste rheological data were also compared using two simpler tests, minislump and Marsh cone. The goal was to determine whether the simpler tests could be used to characterize the rheology of cement paste adequately. The conclusions are that these simpler tests are unreliable for measuring workability.

Subfields: Building and Construction, Fluid Flow and Transfer Processes, Ocean Engineering

View Paper: https://www.semanticscholar.org/paper/ef9dfc84240ad5e589a1ee60f9248d8a4d5d49a7

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In Building and Construction

In Fluid Flow and Transfer Processes

In Ocean Engineering

Citations in the corpus

An experimental study on optimum usage of GGBS for the compressive strength of concrete (2007, background): “The lower cement requirement also leads to a reduction for CO2 generated by the production of cement [1–4].”
Rheology of alkali-activated slag pastes. Effect of the nature and concentration of the activating solution (2014, background): “Many authors have studied Portland cement paste rheology as a preliminary to determining the rheology of the respective mortars and concretes [3–9].”
Compressive strength and microstructural analysis of fly ash/palm oil fuel ash based geopolymer mortar (2014, background): “The most common reason for poor workability is that the addition of a fine powder increases demand for water as the surface area has increased [37].”
Alkali activated fly ash: effect of admixtures on paste rheology (2009, background): “In the general pattern observed in these systems, the presence of admixtures induces a decrease in plastic viscosity and yield stress, which normally goes hand-in-hand with higher flow values ( Ferraris et al. 2001; Lachemi et al. 2004).”
The effect of nanosilica addition on flowability, strength and transport properties of ultra high performance concrete (2014, result): “The obtained results in this study confirmed the fact that, for a constant volume of powder, the replacement of cement by a fine powder particle with high specific surface area will increase the water demand in order tomaintain the workability of the mixture [39–40].”