Marble Waste Valorization through Alkali Activation
| Autor: | Georgios Bartzas, Athanasia Soultana, Konstantinos Komnitsas |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
metakaolin
lcsh:QE351-399.2 Absorption of water Materials science Curing (food preservation) 0211 other engineering and technologies Sodium silicate 02 engineering and technology Raw material chemistry.chemical_compound Alkali activation 021105 building & construction Marble waste Fourier transform infrared spectroscopy Porosity Metakaolin lcsh:Mineralogy Geology 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology marble waste Compressive strength chemistry Chemical engineering alkali activation 0210 nano-technology |
| Zdroj: | Minerals Volume 11 Issue 1 Minerals, Vol 11, Iss 46, p 46 (2021) |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min11010046 |
| Popis: | In the present study, the valorization potential of marble waste in the presence of metakaolin via alkali activation was explored. The activating solution used consisted of NaOH and sodium silicate solutions. The effects of marble waste to metakaolin ratio, particle size of raw materials, curing temperature, and Na2O/SiO2 and H2O/Na2O molar ratios present in the activating solution on the main properties and the morphology of the produced alkali-activated materials (AAMs) was evaluated. The durability and structural integrity of the AAMs after firing at temperatures between 200 and 600 ° C, immersion in deionized water and 1 mol/L NaCl solution for different time periods and subjection to freeze&ndash thaw cycles were also investigated. Characterization techniques including Fourier transform infrared spectroscopy, X-ray diffraction, mercury intrusion porosimetry and scanning electron microscopy were used in order to study the structure of the produced AAMs. &Tau he highest compressive strength (~36 MPa) was achieved by the AAMs prepared with marble waste to metakaolin mass ratio of 0.3 after curing at 40 ° C. The results indicated that the utilization of marble waste in the presence of metakaolin enables the production of AAMs with good physical (porosity, density and water absorption) and mechanical properties, thus contributing to the valorization of this waste type and the reduction of the environmental footprint of the marble industry. |
| Databáze: | OpenAIRE |
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