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| Naji, M. |
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| Petrov, R. H. | Madrid |
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Vejmelková, E.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (50/50 displayed)
- 2020Phase composition of ceramic-based alkali-activated polymers: combination of X-ray diffraction and thermal analysiscitations
- 2020Effects of accelerated carbonation on properties of ceramic-based geopolymerscitations
- 2020Alkaline activation of low-reactivity ceramics: Peculiarities induced by the precursors' dual charactercitations
- 2019Thermal, hygric and mechanical properties of HPC containing silica fumecitations
- 2019Preparation of geopolymers based on ceramic waste productscitations
- 2019Kinetic sorption in the transport of species in a cement based compositecitations
- 2019Effect of a varying moisture diffusivity in the transport of gadolinium in a porous materialcitations
- 2019Characterization of geopolymers prepared using powdered brickcitations
- 2019Pore structure and hygrothermal characteristics of HPC based on Portland cement - Slag blends
- 2019Thermal characteristics of bentonite cement based composites
- 2019Effect of Cu-Zn coated steel fibers on high temperature resistance of reactive powder concretecitations
- 2019Effect of zeolite as a sorbent on cesium toxicity of cement-based materials
- 2018Porous structure and hygric properties of concrete for radioactive waste repositoriescitations
- 2018Mechanical and basic physical properties of high-strength concrete exposed to elevated temperaturescitations
- 2018Microstructure of reactive powder concrete,Mikrostruktura betonów z proszków reaktywnych
- 2018Influence of supplementary cementitious materials on the properties of concrete for secondary protection barrier in radioactive waste repositoriescitations
- 2018Experimental evaluation of cumulative damage of plasters exposed to environmental conditions of central europe
- 2018Development of porous structure of ceramic-based geopolymers
- 2017The comparison of water, water vapour transport properties and mechanical characterization of two commercial plasters on market in the Czech Republic
- 2017Effect of ambient conditions on the properties of concrete containing waste materials as partial portland cement replacementcitations
- 2017Monitoring the damage of exterior renders caused by the environmentcitations
- 2017Properties of lime-cement plasters incorporating ceramic powdercitations
- 2017Engineering properties of concrete suitable for constructing physical barriers in radioactive waste disposal facilities
- 2017Microstructure, texture, and mechanical properties of geopolymers prepared using industrial waste
- 2017Preparation of geopolymer mixes using by-products from brick factories,Przygotowanie mieszanek geopolimerowych z produktów ubocznych z cegielni
- 2016High-temperature resistance of concretes produced of two different cements,Odporność na wysoką temperaturę betonów otrzymanych z dwóch różnych cementów
- 2015Service life assessment of exterior lime-pozzolan renders containing ceramic powdercitations
- 2015Air-entrained concrete technology as an effective tool for increasing the limits of brick powder percentage in blended Portland cement binders,Technologia betonu napowietrzonego jako efektywna metoda zwiększenia dodatku zmielonych odpadów z cegieł w cementach wieloskładnikowych
- 2015A material database for the computational assessment of the degradation of historical masonry
- 2015Characterization of the effect of brick-powder application in lime-based plasterscitations
- 2014The high temperature resistance of a para-aramid fibre-reinforced concrete compositecitations
- 2013Effective hygric and thermal parameters of historical masonry accessed on effective media theory principles
- 2013Mechanical, hygric and thermal properties of building stonescitations
- 2013Properties of plasters suitable for reconstruction of historical buildingscitations
- 2013Application of natural zeolite as supplementary cementitious material in concrete production
- 2012Microstructural changes and residual properties of fiber reinforced cement composites exposed to elevated temperatures,Zmiany mikrostruktury i właściwości resztkowe kompozytów cementowych zbrojonych włóknami poddanych działaniu wysokich temperatur
- 2012Natural zeolite as environmentally friendly supplementary cementitious material in concretecitations
- 2012Microstructural changes and residual properties of fiber reinforced cement composites exposed to elevated temperatures
- 2011Mechanical, hygric and thermal properties of innovative renovation renderscitations
- 2011Application of effective media theory in the characterization of the hygrothermal performance of masonry
- 2011Commercial renovation renders: Mechanical, hygric, thermal and durability properties,Odnawianie tynków: Trwałość oraz właściwości mechaniczne, wilgotnościowe, cieplne
- 2010Material properties of plasters for façade renovation of historical buildings
- 2010Properties of HPC containing supplementary cementing materialscitations
- 2010Fine-ground ceramics as an alternative binder in high performance concretecitations
- 2010Thermal properties of aramid-fiber reinforced cement compositecitations
- 2009Properties of innovative renders on a lime basis for the renovation of historical buildingscitations
- 2009Influence of material characteristics of concrete and thermal insulation on the service life of exterior renderscitations
- 2009Heat and moisture transport in porous materials involving cyclic wetting and dryingcitations
- 2009Fly ash influence on the properties of high performance concrete,Wpływ popiołu lotnego na właściwości BWW
- 2008Effect of high temperatures on mechanical and thermal properties of carbon-fiber reinforced cement composite,Wpływ wysokich temperatur na mechaniczne i cieplne właściwości kompozytów cementowych zbrojonych włóknami węglowymi
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article
Alkaline activation of low-reactivity ceramics: Peculiarities induced by the precursors' dual character
Abstract
In the alkaline activation process, precursors with high reactivity are mostly used. If low-reactivity materials are utilized, it is necessary to take into account their dual character, i.e., that only their amorphous portion can react and the remaining crystalline part acts as microfiller. The composite character of obtained alkali-activated materials can then induce some peculiarities which are not observed for geopolymers based on high-reactivity precursors. In this paper, alkaline activation of low-reactivity ceramic grinding dust is investigated. Microstructure and phase composition of the prepared aluminosilicates are analyzed at first, and empirical geopolymer formulas in the form nM(2)O center dot pCaO center dot Al2O3 center dot xSiO(2)center dot yH(2)O are derived in dependence on activator alkalinity and curing temperature. The dependence of flexural strength upon Al/(Na+ 1/2 Ca) molar ratio calculated for the amorphous portion of the analyzed aluminosilicates is identified as the most distinct feature characterizing the links between microstructure, composition, and properties. The improvement of mechanical properties is related to the enhancement of matrix-aggregate composite effect and refinement of pore structure due to the incorporation of crystalline substances into the aluminosilicate matrix.