Prague, Czech Republic
Prague, Czech Republic

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Perna I.,Czech Institute of Rock Structure And Mechanics | Hanzlicek T.,Czech Institute of Rock Structure And Mechanics | Boura P.,Czech Development Agency Ops Czda | Lucanik A.,Czech Development Agency Ops Czda
Materials and Manufacturing Processes | Year: 2016

This article describes the successful manufacture of new grinding wheels based on a binding agent from a clay substance and blast-furnace slag (the Ca-K geopolymer matrix) on industrial presses. Trained factory staff of the company Best - Business, a.s. tested the pressing process for the manufacture of geopolymer-bonded wheels and verified their quality by factory control equipment (Grindo Sonic and Zeiss-Mackensen methods, test of the safe peripheral speed). The results have shown that the Ca-K geopolymer matrix is suitable for grinding-tool preparation and the grinding-wheel properties are comparable with similar products based on the fired ceramic binding agent. © 2016 Taylor & Francis Group, LLC.


Perna I.,Czech Institute of Rock Structure And Mechanics | Hanzlicek T.,Czech Institute of Rock Structure And Mechanics | Boura P.,Czech Development Agency Ops Czda | Lucanik A.,Czech Development Agency Ops Czda
Materials and Manufacturing Processes | Year: 2015

This article describes the successful manufacture of new grinding wheels based on a binding agent from a clay substance and blast-furnace slag (the Ca–K geopolymer matrix) on industrial presses. Trained factory staff of the company Best – Business, a.s. tested the pressing process for the manufacture of geopolymer-bonded wheels and verified their quality by factory control equipment (Grindo Sonic and Zeiss-Mackensen methods, test of the safe peripheral speed). The results have shown that the Ca–K geopolymer matrix is suitable for grinding-tool preparation and the grinding-wheel properties are comparable with similar products based on the fired ceramic binding agent. 2015 Copyright © Taylor & Francis Group, LLC


Hanzlicek T.,Czech Institute of Rock Structure And Mechanics | Perna I.,Czech Institute of Rock Structure And Mechanics | Ertl Z.,Czech Development Agency Ops Czda | Miller S.M.,University of Memphis
Acta Geodynamica et Geomaterialia | Year: 2012

This paper presents the historical background of the 20th-century technology of geopolymers in light of a literature research of the 15th to 19th centuries and offers a hypothesis on why this historical knowledge was forgotten when Portland cement appeared. The recapitulation of the different cementitious calcareous matters returns all the way to the Bible builders; Ancient Vitruvius Pollio's work "Ten Books of Architecture". These books were not only read but practically proven in pre-Portland times and especially at the beginning of 19th century. The long-term stability of Roman mortars and constructions was studied from the perspective of the cementitious materials, and the cited literature demonstrates the historical evolution of calcareous cements, then the reasons for the interruption of progress and return to the historical experience in the 1980s.

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