Composition and Microstructure of Alkali Activated Fly Ash Binder: Effect of the Activator

This article describes the relationship between the mineralogical and microstructural characteristics of alkaline activated fly ash mortars (activated with NaOH, NA2CO3 and waterglass solutions) and its mechanical properties. Results indicate that in all cases (regardless of what activator was used), the main reaction product formed was an alkaline aluminosilicate gel, with low-ordered crystalline structure. This product is responsible for the excellent mechanical-cementitious properties of the activated fly ash. However, the microstructure as well as the Si/Al and Na/Al ratios of the aluminosilicate gel changes as a function of the activator type used in the system. Some zeolites were formed as a secondary reaction product. The nature and composition of such zeolites also depend on the type of activator that is used.

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  • Authors:
    • Fernandez-Jimenez, A
    • Palomo, A
  • Publication Date: 2005-10


  • English

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  • Accession Number: 01011028
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 23 2005 11:46PM