Preliminary study of the pozzolanic activity of dumped mine wastes obtained from the North Bohemian Basin in the Czech Republic

0473598 - ÚTAM 2018 RIV LT eng J - Journal Article
Sotiriadis, Konstantinos - Šašek, Petr - Ševčík, Radek - Schmidt, P. - Řehoř, M. - Viani, Alberto
Preliminary study of the pozzolanic activity of dumped mine wastes obtained from the North Bohemian Basin in the Czech Republic.
Materials Science. Roč. 23, č. 1 (2017), s. 64-69. ISSN 1392-1320. E-ISSN 2029-7289
R&D Projects: GA MŠMT(CZ) LO1219
Keywords : pozzolanic activity * dumped mine wastes * lime mortars * thermal analysis
OECD category: Materials engineering
Impact factor: 0.450, year: 2017
https://www.exeley.com/materials_science/doi/10.5755/j01.ms.23.1.14864

Three dumped raw materials, a tuff and two bentonites, obtained from two mining sites at the North Bohemian basin in the Czech Republic, have been studied in order to evaluate them as pozzolanic admixtures in lime mortars for employment in restoration of cultural heritage objects. After thermal activation (800 °C, 5 h), their pozzolanic properties were compared with those of commercial metakaolin. Quantitative phase analysis with the Rietveld method from X-ray powder diffraction patterns, morphological observations, as well as the Frattini and the modified Chapelle tests were performed. In addition, lime mortars, incorporating the fired materials, were prepared and subjected to simultaneous thermal analysis after a 28-day initial curing (20 ± 1 °C, 60 ± 5 % RH). The results showed that all three materials possess pozzolanic activity. However, when employed in lime mortars they did not result in formation of pozzolanic reaction products. Two methods were proposed to improve their reactivity, grinding to obtain finer particle size and removal of quartz content where necessary.
Permanent Link: http://hdl.handle.net/11104/0270726