Mechanical properties of cotton fabric reinforced geopolymer composites at 200–1000 ℃

doi:10.1007/s40145-014-0109-x

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Abstract

Geopolymer composites containing woven cotton fabric (0–8.3 wt%) were fabricated using the hand lay-up technique, and were exposed to elevated temperatures of 200 ℃, 400 ℃, 600 ℃, 800 ℃ and 1000 ℃. With an increase in temperature, the geopolymer composites exhibited a reduction in compressive strength, flexural strength and fracture toughness. When heated above 600 ℃, the composites exhibited a significant reduction in mechanical properties. They also exhibited brittle behavior due to severe degradation of cotton fibres and the creation of additional porosity in the composites. Microstructural images verified the existence of voids and small channels in the composites due to fibre degradation.

Key words： geopolymer composites microstructures mechanical properties fracture toughness

Received: 09 April 2014 Published: 11 June 2015

Corresponding Authors: It-Meng LOW

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	Articles by authors
	Thamer ALOMAYRI
	Les VICKERS
	Faiz U. A. SHAIKH
	It-Meng LOW

Cite this article:

Thamer ALOMAYRI,Les VICKERS,Faiz U. A. SHAIKH, et al. Mechanical properties of cotton fabric reinforced geopolymer composites at 200–1000 ℃[J]. Journal of Advanced Ceramics, 2014, 3(3): 184-193.

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http://jac.tsinghuajournals.com/EN/10.1007/s40145-014-0109-x OR http://jac.tsinghuajournals.com/EN/Y2014/V3/I3/184

Chemical composition of fly-ash in weight percentage (Unit: wt%)

TGA curves of (a) cotton fibres, (b) pure geopolymers and (c) geopolymer composites.

Drying shrinkage of geopolymer composites at various temperatures.

Porosity of geopolymer composites at various temperatures.

Geopolymer composites loaded with 8.3 wt% CF before and after heating at various temperatures.

Photograph of the geopolymer composites loaded with 0 wt% CF after heating at 1000 ℃.

Compressive strength of geopolymer composites at various temperatures.

Flexural strength of geopolymer composites at various temperatures.

SEM images of the fracture surface for geopolymer composites loaded with 8.3 wt% CF at various temperatures: (a) 200 ℃, (b) 400 ℃, (c) 600 ℃, (d) 800 ℃ and (e) 1000 ℃.

Fracture toughness of geopolymer composites at various temperatures.

Optical micrographs of geopolymer composites loaded with 8.3 wt% CF at various temperatures: (a) 200 ℃, (b) 400 ℃, (c) 600 ℃, (d) 800 ℃ and (e) 1000 ℃ .

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