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Open AccessArticle

Rheology of Alkali-Activated Mortars: Influence of Particle Size and Nature of Aggregates

Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC), 28033 Madrid, Spain
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Minerals 2020, 10(8), 726; https://doi.org/10.3390/min10080726
Received: 13 July 2020 / Revised: 10 August 2020 / Accepted: 15 August 2020 / Published: 18 August 2020
(This article belongs to the Special Issue Alkali Activated Materials: Advances, Innovations, Future Trends)
The effect of two precursors (slag and fly ash), different particle size distribution, and three types of aggregate (siliceous sand, limestone, and recycled concrete) on alkali-activated material (AAM) mortar rheology were studied and compared to their effect on an ordinary Portland Cement (OPC) mortar reference. Stress growth and flow curve tests were conducted to determine plastic viscosity and static and dynamic yield stress of the AAM and OPC mortars. In both OPC and AAM mortars, a reduction of the aggregate size induces a rise of the liquid demand to preserve the plastic consistency of the mortar. In general terms, an increase of the particle size of the siliceous aggregates leads to a decrease of the measured rheological parameters. The AAM mortars require higher liquid/solid ratios than OPC mortars to attain plastic consistency. AAM mortars proved to be more sensitive than OPC mortars to changes in aggregate nature. The partial replacement of the siliceous aggregates with up to 20% of recycled concrete aggregates induced no change in mixing liquid uptake, in either AAM or OPC mortars. All the AAM and OPC mortars studied fitted to the Bingham model. View Full-Text
Keywords: alkali-activated materials; OPC; mortars; rheology; aggregates; slag; fly ash alkali-activated materials; OPC; mortars; rheology; aggregates; slag; fly ash
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MDPI and ACS Style

Gismera, S.; Alonso, M.d.M.; Palacios, M.; Puertas, F. Rheology of Alkali-Activated Mortars: Influence of Particle Size and Nature of Aggregates. Minerals 2020, 10, 726. https://doi.org/10.3390/min10080726

AMA Style

Gismera S, Alonso MdM, Palacios M, Puertas F. Rheology of Alkali-Activated Mortars: Influence of Particle Size and Nature of Aggregates. Minerals. 2020; 10(8):726. https://doi.org/10.3390/min10080726

Chicago/Turabian Style

Gismera, Sara; Alonso, María d.M.; Palacios, Marta; Puertas, Francisca. 2020. "Rheology of Alkali-Activated Mortars: Influence of Particle Size and Nature of Aggregates" Minerals 10, no. 8: 726. https://doi.org/10.3390/min10080726

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