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The growth of the industrial production generates a high volume of waste materials. These products have a significant impact on the environment. Therefore, the valorization of industrial wastes, especially those produced in huge quantities, is an important social and ecological issue. Waste reuse and recycling could help to develop new products and aggregate value to materials that would have been previously discarded. Furthermore, it could reduce the consumption of natural resources and pollution. Blast furnace slag and fly ash are waste materials largely used in concrete production, mainly as an aggregate, and road construction, as porous asphalt and in other contexts. These wastes contain many elements that are also present in typical glass formulas, such as CaO, SiO2, Al2O3, and Fe2O3. However, these elements are highly refractory, and their presence in complex compositions leads to a high tendency to crystallize and to high working temperatures. For this reason, it is a challenge to get transparent materials at reasonable temperatures from these waste products. Glass is a material that allows large amounts of various elements in solution, and is suitable for assimilating the complex materials in its compositions. In this work, we produced transparent glass samples incorporating amounts up to 35% (in weight) of blast furnace slag or fly ash. The compositions were adjusted in order to allow for chemically durable glasses in relatively low melting temperature: the samples were successfully submitted to water durability tests and were obtained in melting temperatures between 1100°C and 1350°C, depending on the composition. The melting conditions were optimized in order to achieve a higher transparency. The optical, mechanical and thermal properties of the samples were measured and compared to the standard borosilicate and soda-lime glasses.

Original languageEnglish
Title of host publicationProceedings of the Challenging Glass Conference 6 (CGC 6)
Subtitle of host publicationInternational Conference on the Architectural and Structural Application of Glass
EditorsChristian Louter, Freek Bos, Jan Belis, Fred Veer, Rob Nijsse
PublisherTU Delft Open
Pages533-542
Number of pages10
ISBN (Electronic)978-94-6366-044-0
DOIs
Publication statusPublished - 2018
EventChallenging Glass 6: International Conference on the Architectural and Structural Application of Glass - TU Delft, Delft, Netherlands
Duration: 17 May 201818 May 2018
Conference number: 6
http://www.challengingglass.com
http://challengingglass.com/

Conference

ConferenceChallenging Glass 6
Abbreviated titleCGC
CountryNetherlands
CityDelft
Period17/05/1818/05/18
OtherChallenging Glass is an international bi-annual conference that aims at gathering world class designers, engineers, researchers and industry partners to discuss on the architectural and structural use of glass.
Internet address

    Research areas

  • Fly Ash, Glass, Industrial waste, Phosphate glass, Recycling, Slag

ID: 66955163