Mechanical Performances of Weathered Coal Fly Ash Based Geopolymer Bricks

In this paper weathered coal fly ash has been used in polycondensation processes aimed at the production of geopolymer–based low temperature ceramic bricks. The ash has been employed both “as received” and after drying, showing favorable reactivity in any case. Different curing conditions with a variable period at 60 °C have been tested. Samples obtained have been characterized by measuring Unconfined Compressive Strength (UCS) and by SEM observations. Good strength values have been obtained with the systems tested. Furthermore, it has been found that mechanical performance increases as the time during which samples are kept at 60 °C increases.

[1]  B. V. Rangan,et al.  Fly ash-based geopolymer concrete: study of slender reinforced columns , 2007 .

[2]  Prinya Chindaprasirt,et al.  Workability and strength of lignite bottom ash geopolymer mortar. , 2009, Journal of hazardous materials.

[3]  J. Deventer,et al.  The Role of Inorganic Polymer Technology in the Development of ‘Green Concrete’ , 2007 .

[4]  Ahmet Tuncan,et al.  Physical, Mechanical and Micro-Structural Properties of F Type Fly-Ash Based Geopolymeric Bricks Produced by Pressure Forming Process , 2010 .

[5]  Raffaele Cioffi,et al.  Optimization of geopolymer synthesis by calcination and polycondensation of a kaolinitic residue , 2003 .

[6]  R. Cioffi,et al.  Coal fly ash as raw material for the manufacture of geopolymer-based products. , 2008, Waste management.

[7]  C. Shi,et al.  Alkali-Activated Cements and Concretes , 2003 .

[8]  Z. Baščarević,et al.  Mechanical and microstructural properties of alkali-activated fly ash geopolymers. , 2010, Journal of hazardous materials.

[9]  P. Bowen,et al.  Changes in portlandite morphology with solvent composition: Atomistic simulations and experiment , 2011 .

[10]  A. Buchwald,et al.  The suitability of thermally activated illite/smectite clay as raw material for geopolymer binders , 2009 .

[11]  J. Deventer,et al.  The geopolymerisation of alumino-silicate minerals , 2000 .

[12]  J. Davidovits.  Geopolymers : inorganic polymeric new materials , 1991 .

[13]  John L. Provis,et al.  Correlating mechanical and thermal properties of sodium silicate-fly ash geopolymers , 2009 .

[14]  L Zou,et al.  Reduction of metal leaching in brown coal fly ash using geopolymers. , 2004, Journal of hazardous materials.

[15]  Jadambaa Temuujin,et al.  Preparation and characterisation of fly ash based geopolymer mortars , 2010 .

[16]  J. Deventer,et al.  Geopolymer technology: the current state of the art , 2007 .

[17]  Luisa Barbieri,et al.  Chemical stability of geopolymers containing municipal solid waste incinerator fly ash. , 2010, Waste management.