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Article

Ternary Blended Binder for Production of a Novel Type of Lightweight Repair Mortar

1
Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic
2
Department of Inorganic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2019, 12(6), 996; https://doi.org/10.3390/ma12060996
Received: 20 February 2019 / Revised: 12 March 2019 / Accepted: 22 March 2019 / Published: 26 March 2019
(This article belongs to the Special Issue Sustainability in Construction and Building Materials)
The goal of the paper was development and testing of a novel type of ternary blended binder based on lime hydrate, metakaolin, and biomass ash that was studied as a binding material for production of lightweight mortar for renovation purposes. The biomass ash used as one of binder components was coming from wood chips ash combustion in a biomass heating plant. The raw ash was mechanically activated by grinding. In mortar composition, wood chips ash and metakaolin were used as partial substitutes of lime hydrate. Silica sand of particle size fraction 0–2 mm was mixed from three normalized sand fractions. For the evaluation of the effect of biomass ash and metakaolin incorporation in mortar mix on material properties, reference lime mortar was tested as well. Among the basic physical characterization of biomass ash, metakaolin and lime hydrate, specific density, specific surface, and particle size distribution were assessed. Their chemical composition was measured by X-Ray fluorescence analysis (XRF), morphology was examined using scanning electron microscopy (SEM), elements mapping was performed using energy dispersive spectroscopy (EDS) analyser, and mineralogical composition was tested using X-Ray diffraction (XRD). For the developed mortars, set of structural, mechanical, hygric, and thermal properties was assessed. The mortars with ternary blended binder exhibited improved mechanical resistance, lower thermal conductivity, and increased water vapor permeability compared to the reference lime mortar. Based on good functional performance of the produced mortar, the tested biomass ash could potentially represent a novel sustainable alternative to other pozzolans commonly used in construction industry. Moreover, reuse of biomass ash in production of building materials is highly beneficial both from the environmental and economic reasons especially taking into account circular economy principles. The ternary blended binder examined in this paper can find use in both rendering and walling repair mortars meeting the requirements of culture heritage authorities and technical standards. View Full-Text
Keywords: biomass combustion; ternary blended binder; lightweight mortar; pozzolanic activity; functional properties biomass combustion; ternary blended binder; lightweight mortar; pozzolanic activity; functional properties
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MDPI and ACS Style

Pavlíková, M.; Zemanová, L.; Záleská, M.; Pokorný, J.; Lojka, M.; Jankovský, O.; Pavlík, Z. Ternary Blended Binder for Production of a Novel Type of Lightweight Repair Mortar. Materials 2019, 12, 996. https://doi.org/10.3390/ma12060996

AMA Style

Pavlíková M, Zemanová L, Záleská M, Pokorný J, Lojka M, Jankovský O, Pavlík Z. Ternary Blended Binder for Production of a Novel Type of Lightweight Repair Mortar. Materials. 2019; 12(6):996. https://doi.org/10.3390/ma12060996

Chicago/Turabian Style

Pavlíková, Milena, Lucie Zemanová, Martina Záleská, Jaroslav Pokorný, Michal Lojka, Ondřej Jankovský, and Zbyšek Pavlík. 2019. "Ternary Blended Binder for Production of a Novel Type of Lightweight Repair Mortar" Materials 12, no. 6: 996. https://doi.org/10.3390/ma12060996

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