Studying the metakaolin content, fiber type, and high-temperature effects on the physico-mechanical properties of fly ash-based geopolymer composites

• Autorzy: Bayrak Bariş , Alcan Haluk Görkem , Durmaz Özge Çiğdem Özelmacı , ipek Süleyman , Kaplan Gökhan , Güneyisi Erhan , Aydın Abdulkadir Cüneyt

Identyfikatory

DOI

10.1007/s43452-024-01071-9

• Języki publikacji: EN

Abstrakty

EN

The study investigated the physicasl characteristics and mechanical performance of fly ash-based geopolymer composites when exposed to high temperatures. Geopolymer composites were produced using fly ash as an aluminosilicate-rich raw material and a combination of sodium silicate and sodium hydroxide as an alkaline activator. In this context, the study also examined the impact of partially replacing metakaolin (7.5% and 15% by weight). Furthermore, the study aims to examine the impact of adding fiber (basalt and carbon types) on the physical, mechanical, and high-temperature properties of geopolymer composites. The physical properties investigated were unit weight, apparent porosity, water absorption, and capillary water absorption, while the strength performances investigated were flexural and compressive strengths. To monitor the effect of high temperatures on the strength characteristics of the geopolymer composites, the mixtures were exposed to temperatures of 200 °C, 400 °C, and 600 °C. Besides, SEM images were provided to illustrate the degree of geopolimerization. The results indicated that metakaolin replacement yielded mixtures having higher unit weight, but lower apparent porosity and water absorption. The results indicated that metakaolin replacement yielded mixtures having a higher unit weight, reaching an increase of about 5%, but lower apparent porosity and water absorption, with decreases reaching 18.3% and 20%, respectively. The metakaolin-blended geopolymer composites resulted in better strength performance and resistance to high temperatures. Raising the metakaolin replacement level from 0 to 15% led to an increase of 17.3% in flexural strength. The compressive strength of the composites subjected to a temperature of 200 °C exhibited an increase of over 10%. Notably, this rate of increment was observed to be nearly 20% higher in nonfibrous composites. Fiber addition decreased the compressive strength up to about 21%, while increasing the flexural strength up to 65%. Strength performance improved at 200 °C, but decreased at higher temperatures up to 600 °C. The geopolymer composites experienced significant mass loss when exposed to high temperatures.

Słowa kluczowe

EN

basalt fiber; carbon fiber; geopolymer mortar; SEM analysis; strength performance

PL

włókno bazaltowe; włókno węglowe; zaprawa geopolimerowa; analiza SEM; parametry wytrzymałościowe

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2025
• Tom: Vol. 25, no. 1
• Strony: art. no. e2, 2025
• Opis fizyczny: Bibliogr. 34 poz., rys., wykr.

Twórcy

autor

Bayrak Bariş

• Faculty of Engineering and Architecture, Civil Engineering Department, Kafkas University, 36100 Kars, Türkiye

autor

Alcan Haluk Görkem

• Faculty of Engineering and Architecture, Civil Engineering Department, Kafkas University, 36100 Kars, Türkiye

autor

Durmaz Özge Çiğdem Özelmacı

• Engineering Faculty, Civil Engineering Department, Hasan Kalyoncu University, 27010 Gaziantep, Türkiye

autor

ipek Süleyman

• Engineering Faculty, Civil Engineering Department, Yaşar University, 35100, İzmir, Türkiye
• Faculty of Engineering and Architecture, Civil Engineering Department, Bingöl University, 12000 Bingöl, Türkiye

autor

Kaplan Gökhan

• Engineering Faculty, Civil Engineering Department, Atatürk University, 25030 Erzurum, Türkiye

autor

Güneyisi Erhan

• Engineering Faculty, Civil Engineering Department, Harran University, 63290 Şanlıurfa, Türkiye

autor

Aydın Abdulkadir Cüneyt

• Engineering Faculty, Civil Engineering Department, Atatürk University, 25030 Erzurum, Türkiye

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)