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Materials 2016, 9(7), 586; doi:10.3390/ma9070586

Superplasticizer Addition to Carbon Fly Ash Geopolymers Activated at Room Temperature

Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, via Terracini, 28, Bologna 40131, Italy
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Academic Editor: Claudio Ferone
Received: 31 May 2016 / Revised: 10 July 2016 / Accepted: 13 July 2016 / Published: 18 July 2016
(This article belongs to the Special Issue Advances in Geopolymers and Alkali-Activated Materials)
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Abstract

Present concerns about global warming due to the greenhouse emissions in the atmosphere have pushed the cement industry to research alternatives to ordinary Portland cement (OPC). Geopolymer binder may constitute a possible breakthrough in the development of sustainable materials: understanding the effectiveness and the influences of superplasticizers on geopolymer systems is one of the essential requirements for its large-scale implementation. This study aims to investigate the possibility of using commercially available chemical admixtures designed for OPC concrete, to improve fresh properties of fly ash-based geopolymers and mortars. A special emphasis is laid upon evaluating their influence on mechanical and microstructural characteristics of the hardened material realized under room-temperature curing conditions. Results indicate that the addition of a polycarboxylic ether-based superplasticizer, in the amount of 1.0 wt. % by mass of fly ash, promotes an improvement in workability without compromising the final strength of the hardened material. Moreover, the addition of the polycarboxylic ether- and acrylic-based superplasticizers induces a refinement in the pore structure of hardened mortar leading to a longer water saturation time. View Full-Text
Keywords: geopolymer; admixtures; superplasticizers; workability; mechanical properties; porosity geopolymer; admixtures; superplasticizers; workability; mechanical properties; porosity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Carabba, L.; Manzi, S.; Bignozzi, M.C. Superplasticizer Addition to Carbon Fly Ash Geopolymers Activated at Room Temperature. Materials 2016, 9, 586.

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