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Article

Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics

1
Department of Civil Engineering, Niğde Ömer Halisdemir University, Niğde 51240, Turkey
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Department of Environmental Engineering, Niğde Ömer Halisdemir University, Niğde 51240, Turkey
3
Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK
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Department of Aerospace Science and Technology, Politecnico di Milano, 20156 Milano, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Dolores Eliche Quesada
Materials 2021, 14(11), 2935; https://doi.org/10.3390/ma14112935
Received: 20 April 2021 / Revised: 11 May 2021 / Accepted: 25 May 2021 / Published: 29 May 2021
(This article belongs to the Special Issue Advanced Technologies for Sustainable Materials)
This study aimed to determine the effects of design parameters, including the liquid/solid ratio (L/S), Na2SiO3/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 Na2SiO3/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 Na2SiO3/NaOH ratio of 2. Moreover, the best thermal curing temperature for obtaining optimal strength characteristics was 100 °C for the FB. View Full-Text
Keywords: environmentally friendly sustainable material; numerical analysis; fly ash; geopolymer; SEM-EDX; TGA-DTA; XRD; reuse; waste environmentally friendly sustainable material; numerical analysis; fly ash; geopolymer; SEM-EDX; TGA-DTA; XRD; reuse; waste
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MDPI and ACS Style

Öz, H.Ö.; Doğan-Sağlamtimur, N.; Bilgil, A.; Tamer, A.; Günaydin, K. Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics. Materials 2021, 14, 2935. https://doi.org/10.3390/ma14112935

AMA Style

Öz HÖ, Doğan-Sağlamtimur N, Bilgil A, Tamer A, Günaydin K. Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics. Materials. 2021; 14(11):2935. https://doi.org/10.3390/ma14112935

Chicago/Turabian Style

Öz, Hatice Ö., Neslihan Doğan-Sağlamtimur, Ahmet Bilgil, Aykut Tamer, and Kadir Günaydin. 2021. "Process Development of Fly Ash-Based Geopolymer Mortars in View of the Mechanical Characteristics" Materials 14, no. 11: 2935. https://doi.org/10.3390/ma14112935

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