Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics
This study aimed to determine the effects of design parameters, including the liquid/solid ratio (L/S), Na<sub>2</sub>SiO<sub>3</sub>/NaOH weight ratio, and curing temperature, on class F fly ash-based geopolymer composites. For this purpose, two disparate sources of fly ash...
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MDPI AG
2021-05-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/11/2935 |
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| author | Hatice Öznur Öz Neslihan Doğan-Sağlamtimur Ahmet Bilgil Aykut Tamer Kadir Günaydin |
| author_facet | Hatice Öznur Öz Neslihan Doğan-Sağlamtimur Ahmet Bilgil Aykut Tamer Kadir Günaydin |
| author_sort | Hatice Öznur Öz |
| collection | DOAJ |
| description | This study aimed to determine the effects of design parameters, including the liquid/solid ratio (L/S), Na<sub>2</sub>SiO<sub>3</sub>/NaOH weight ratio, and curing temperature, on class F fly ash-based geopolymer composites. For this purpose, two disparate sources of fly ash were supplied from Çatalağzı (FA) and İsken Sugözü (FB) Thermal Power Plants in Turkey. Two different L/S ratios of 0.2 and 0.4 were used. The Na<sub>2</sub>SiO<sub>3</sub>/NaOH ratios in the alkaline solutions were 1, 1.5, 2, 2.5, and 3 by weight for each type of geopolymer mixture. Then, 40 different mixes were cured at two specific temperatures (70 °C and 100 °C) for 24 h and then preserved at room temperature until testing. Thereafter, the physical water absorption properties, apparent porosity, and bulk density were examined at 28 days on the hardened mortars. Additionally, compressive and flexural tests were applied to the geopolymers at 7, 28, and 90 days. It was found that the highest compressive strength was 60.1 MPa for the geopolymer manufactured with an L/S of 0.2 and Na<sub>2</sub>SiO<sub>3</sub>/NaOH ratio of 2. Moreover, the best thermal curing temperature for obtaining optimal strength characteristics was 100 °C for the FB. |
| first_indexed | 2024-03-10T10:54:32Z |
| format | Article |
| id | doaj.art-4ce9966a0b3f424fad09866ad9726b80 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T10:54:32Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4ce9966a0b3f424fad09866ad9726b802023-11-21T21:59:00ZengMDPI AGMaterials1996-19442021-05-011411293510.3390/ma14112935Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical CharacteristicsHatice Öznur Öz0Neslihan Doğan-Sağlamtimur1Ahmet Bilgil2Aykut Tamer3Kadir Günaydin4Department of Civil Engineering, Niğde Ömer Halisdemir University, Niğde 51240, TurkeyDepartment of Environmental Engineering, Niğde Ömer Halisdemir University, Niğde 51240, TurkeyDepartment of Civil Engineering, Niğde Ömer Halisdemir University, Niğde 51240, TurkeyDepartment of Mechanical Engineering, Imperial College London, London SW7 2AZ, UKDepartment of Aerospace Science and Technology, Politecnico di Milano, 20156 Milano, ItalyThis study aimed to determine the effects of design parameters, including the liquid/solid ratio (L/S), Na<sub>2</sub>SiO<sub>3</sub>/NaOH weight ratio, and curing temperature, on class F fly ash-based geopolymer composites. For this purpose, two disparate sources of fly ash were supplied from Çatalağzı (FA) and İsken Sugözü (FB) Thermal Power Plants in Turkey. Two different L/S ratios of 0.2 and 0.4 were used. The Na<sub>2</sub>SiO<sub>3</sub>/NaOH ratios in the alkaline solutions were 1, 1.5, 2, 2.5, and 3 by weight for each type of geopolymer mixture. Then, 40 different mixes were cured at two specific temperatures (70 °C and 100 °C) for 24 h and then preserved at room temperature until testing. Thereafter, the physical water absorption properties, apparent porosity, and bulk density were examined at 28 days on the hardened mortars. Additionally, compressive and flexural tests were applied to the geopolymers at 7, 28, and 90 days. It was found that the highest compressive strength was 60.1 MPa for the geopolymer manufactured with an L/S of 0.2 and Na<sub>2</sub>SiO<sub>3</sub>/NaOH ratio of 2. Moreover, the best thermal curing temperature for obtaining optimal strength characteristics was 100 °C for the FB.https://www.mdpi.com/1996-1944/14/11/2935environmentally friendly sustainable materialnumerical analysisfly ashgeopolymerSEM-EDXTGA-DTA |
| spellingShingle | Hatice Öznur Öz Neslihan Doğan-Sağlamtimur Ahmet Bilgil Aykut Tamer Kadir Günaydin Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics Materials environmentally friendly sustainable material numerical analysis fly ash geopolymer SEM-EDX TGA-DTA |
| title | Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics |
| title_full | Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics |
| title_fullStr | Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics |
| title_full_unstemmed | Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics |
| title_short | Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics |
| title_sort | process development of fly ash based geopolymer mortars in view of the mechanical characteristics |
| topic | environmentally friendly sustainable material numerical analysis fly ash geopolymer SEM-EDX TGA-DTA |
| url | https://www.mdpi.com/1996-1944/14/11/2935 |
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