Compressive Strength and Microstructural Characteristics of Natural Zeolite-Based Geopolymer

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2018-01-01

Author

ÖZEN KARSLI, SEVGİ
Aleessa Alam, Burhan

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A detailed study of geopolymeric reaction products and mechanical properties of geopolymer pastes prepared with natural zeolite has been investigated by means of compressive strength, XRD and SEM/EDX analysis. Sodium silicate and sodium hydroxide solutions are used as an alkaline activator. The results of the investigation show that the activator ratio plays an important role on the mechanical development of geopolymer pastes. The geopolymeric gel and CSH phase with a low Ca/Si ratio are found as the main reaction product. The increased intensity of CSH phase has a significant effect on the improvement of the compressive strength. Decreased intensity of clinoptilolite and totally consumed clay mineral upon geopolymerization proves the involvement of the aluminosilicate phases in the geopolymeric reaction. The existence of sodium and increment of Si/Al ratio with respect to original zeolitic tuff were detected. The results also show that the investigated natural zeolite, which is emerged as an environmentally friendly, low-cost material, is suitable for the production of geopolymer cement.

Subject Keywords

Natural zeolite, Geopolymer, Compressive strength, Microstructural characteristics

URI

https://hdl.handle.net/11511/36554

Journal

PERIODICA POLYTECHNICA-CIVIL ENGINEERING

DOI

https://doi.org/10.3311/ppci.10848

Collections

Department of Civil Engineering, Article

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Citation Formats

S. ÖZEN KARSLI and B. Aleessa Alam, “Compressive Strength and Microstructural Characteristics of Natural Zeolite-Based Geopolymer,” PERIODICA POLYTECHNICA-CIVIL ENGINEERING, pp. 64–71, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36554.