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Effects of free quartz on mechanical behaviour of kaolinite based geopolymers

Yousefi, E ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1179/175355510X12881754762737
  3. Publisher: 2011
  4. Abstract:
  5. Quartz is usually detected as an impurity of kaolinite clays. The present work attempts to evaluate the role and behaviour of quartz particles in geopolymerisation and its probable effects on mechanical behaviour of geopolymeric products. Two kaolinite clays with different free quartz contents were used as raw materials to produce geopolymers. Results showed that using high content quartz kaolin causes higher compressive strength. Scanning electron microscopy studies confirmed that quartz does not participate in geopolymerisation and completely remains in the structure as fine particles. High hardness quartz particles by retarding crack growth in the geopolymer matrix enhance mechanical behaviour of the samples. Changing the calcination temperature of starting kaolins also showed that strength of geopolymer gel is the most important factor influencing the compressive strength of geopolymers. The positive effect of quartz particles on compressive strength for kaolins calcined at 750°C was more pronounced than that of kaolins calcined at 500°C
  6. Keywords:
  7. Alkali activated cements ; Calcination temperature ; Crack growth ; Fine particles ; Geopolymer matrix ; High hardness ; High-content ; Kaolinite clay ; Mechanical behaviour ; Positive effects ; Quartz particles ; Amorphous materials ; Calcination ; Cements ; Clay ; Geopolymers ; Inorganic polymers ; Kaolin ; Kaolinite ; Mechanical engineering ; Quartz ; Scanning electron microscopy ; Compressive strength
  8. Source: Materials Technology ; Volume 26, Issue 2 , Jul , 2011 , Pages 96-99 ; 10667857 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1179/175355510X12881754762737