MATEC Web Conf.
Volume 274, 2019RICON17 - REMINE International Conference Valorization of Mining and other Mineral Wastes into Construction Materials by Alkali-Activation
|Number of page(s)||5|
|Section||Functional AAM for Artistic, Architectural and Historical Heritage Restoration|
|Published online||22 February 2019|
New casting glass technique through the use of geopolymers
Sculpture Department. University of Granada. 18010. Spain
2 Instituto de Historia. Spanish National Research Council (CSIC). 28037 Madrid, Spain
3 C-MADE. Centre of Materials & Building Technologies. 6201-001 Covilhã. Portugal
* Corresponding author: firstname.lastname@example.org
By using silicate inorganic binders and glass waste (colourless or coloured) it is possible to mould technical and artistic elements, which later can be hardened by means of high temperature processing. This procedure is controlled by both the glass transition temperature of binder and of glass waste used as aggregate. "water glass", catalysed with sodium hydroxide was used as a binder of glass shards from common industrial bottles, classified to a grain size distribution below 2 mm. Chemical analysis shows similarity of silica content between binder and aggregates of recycled glass, establishing as main differences in the percentages of chromophore oxides. In addition dilatometry curves of the two materials show close glass transition temperature values (575 and 598 °C, respectively), fact that facilitates sintering between binder and aggregates. The non-heat-treated samples present good compactness and mechanical resistance values, improved with heat-treatment at 700 °C. The high compactness of heated samples, showing rounded aggregate grains and softening of binder could let a good way for obtaining well-consolidated technical elements, made of recycled glass. From this test, it would be possible to use thermal ranges between 550 and 600 °C, as well as shorter exposure times for a proper hardening.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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