Marble Waste Valorization through Alkali Activation
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 tem...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-01-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/1/46 |
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| author | Konstantinos Komnitsas Athanasia Soultana Georgios Bartzas |
| author_facet | Konstantinos Komnitsas Athanasia Soultana Georgios Bartzas |
| author_sort | Konstantinos Komnitsas |
| collection | DOAJ |
| description | 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 Na<sub>2</sub>O/SiO<sub>2</sub> and H<sub>2</sub>O/Na<sub>2</sub>O 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–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. Τhe 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. |
| first_indexed | 2024-03-10T13:32:53Z |
| format | Article |
| id | doaj.art-5fbad5eff94e4d2c8dcfdf2740a5cb93 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T13:32:53Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-5fbad5eff94e4d2c8dcfdf2740a5cb932023-11-21T07:46:47ZengMDPI AGMinerals2075-163X2021-01-011114610.3390/min11010046Marble Waste Valorization through Alkali ActivationKonstantinos Komnitsas0Athanasia Soultana1Georgios Bartzas2School of Mineral Resources Engineering, Technical University of Crete, 73100 Chania, GreeceSchool of Mineral Resources Engineering, Technical University of Crete, 73100 Chania, GreeceSchool of Mining and Metallurgical Engineering, National Technical University of Athens, 15780 Zografos, GreeceIn 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 Na<sub>2</sub>O/SiO<sub>2</sub> and H<sub>2</sub>O/Na<sub>2</sub>O 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–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. Τhe 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.https://www.mdpi.com/2075-163X/11/1/46marble wastemetakaolinalkali activation |
| spellingShingle | Konstantinos Komnitsas Athanasia Soultana Georgios Bartzas Marble Waste Valorization through Alkali Activation Minerals marble waste metakaolin alkali activation |
| title | Marble Waste Valorization through Alkali Activation |
| title_full | Marble Waste Valorization through Alkali Activation |
| title_fullStr | Marble Waste Valorization through Alkali Activation |
| title_full_unstemmed | Marble Waste Valorization through Alkali Activation |
| title_short | Marble Waste Valorization through Alkali Activation |
| title_sort | marble waste valorization through alkali activation |
| topic | marble waste metakaolin alkali activation |
| url | https://www.mdpi.com/2075-163X/11/1/46 |
| work_keys_str_mv | AT konstantinoskomnitsas marblewastevalorizationthroughalkaliactivation AT athanasiasoultana marblewastevalorizationthroughalkaliactivation AT georgiosbartzas marblewastevalorizationthroughalkaliactivation |