The Influence of Rice Husk Ash Addition on the Properties of Metakaolin-Based Geopolymers

This paper investigates the replacement of metakaolin (MK) with rice husk ash (RHA) in the production of alkali-activated binders or geopolymers. The influence of the RHA addition on compressive and flexural strength, as well as water absorption and apparent porosity were determined, in terms of the percentage of RHA in the mixture and molar ratios of the mixes. Fourier Transform Infrared (FTIR) spectroscopy and Energy Dispersive spectroscopy (EDS) were carried out to assess the changes in the microstructure of the geopolymer matrices with the RHA addition. Results have shown that RHA may be a supplementary precursor for geopolymers. The composition of the geopolymer matrices containing 0-40% RHA is very similar, which indicates that the additional Si provided by RHA is not incorporated to the geopolymer matrix. In addition, geopolymers with RHA content higher than 40% present a plastic behavior, characterized by extremely low strength and high deformation, which can be attributed to the formation of silica gel in formulations containing variable Si/Al ratio.

[1]  Catherine L. Nicholson,et al.  The composition range of aluminosilicate geopolymers , 2005 .

[2]  C. Shi,et al.  New cements for the 21st century: The pursuit of an alternative to Portland cement , 2011 .

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

[4]  María Teresa Blanco-Varela,et al.  Chemical stability of cementitious materials based on metakaolin , 1999 .

[5]  Yu-zhen Yu,et al.  The strength and microstructure of two geopolymers derived from metakaolin and red mud-fly ash admixture: A comparative study , 2012 .

[6]  John L. Provis,et al.  Chemical Research and Climate Change as Drivers in the Commercial Adoption of Alkali Activated Materials , 2010 .

[7]  Ji Hsien Chen,et al.  A preliminary study of reservoir sludge as a raw material of inorganic polymers , 2009 .

[8]  F. A. Miller,et al.  Infrared Spectra and Characteristic Frequencies of Inorganic Ions , 1952 .

[9]  K. Sagoe-Crentsil,et al.  Dissolution processes, hydrolysis and condensation reactions during geopolymer synthesis: Part II. High Si/Al ratio systems , 2007 .

[10]  Chai Jaturapitakkul,et al.  Compressive strength and degree of reaction of biomass- and fly ash-based geopolymer , 2010 .

[11]  Ali Nazari,et al.  Designing water resistant lightweight geopolymers produced from waste materials , 2012 .

[12]  G. C. Cordeiro,et al.  Use of ultrafine rice husk ash with high-carbon content as pozzolan in high performance concrete , 2009 .

[13]  Prinya Chindaprasirt,et al.  Preparation of fly ash and rice husk ash geopolymer , 2009 .

[14]  K. MacKenzie,et al.  Synthesis and characterisation of materials based on inorganic polymers of alumina and silica: sodium polysialate polymers , 2000 .

[15]  M. Weil,et al.  Development of Geopolymers Supported by Systems Analysis , 2006 .

[16]  J. Deventer,et al.  Reaction mechanisms in the geopolymeric conversion of inorganic waste to useful products. , 2007, Journal of hazardous materials.

[17]  John L. Provis,et al.  Nanostructure/microstructure of metakaolin geopolymers , 2009 .

[18]  Ali Allahverdi,et al.  Efflorescence control in geopolymer binders based on natural pozzolan , 2012 .

[19]  Farook Adam,et al.  RICE HUSK ASH SILICA AS A SUPPORT MATERIAL FOR RUTHENIUM BASED HETEROGENOUS CATALYST , 2006 .

[20]  Á. Palomo,et al.  Microstructure Development of Alkali-Activated Fly Ash Cement: A Descriptive Model , 2005 .

[21]  Hua Xu,et al.  Geopolymerisation of multiple minerals , 2002 .

[22]  J.S.J. van Deventer,et al.  THE EFFECT OF COMPOSITION AND TEMPERATURE ON THE PROPERTIES OF FLY ASH- AND KAOLINITE -BASED GEOPOLYMERS , 2002 .

[23]  Á. Palomo,et al.  Durability of alkali-activated fly ash cementitious materials , 2007 .

[24]  B. Saikia,et al.  Fourier transform infrared spectroscopic estimation of crystallinity in SiO2 based rocks , 2008 .

[25]  T. Bakharev,et al.  Resistance of geopolymer materials to acid attack , 2005 .

[26]  Pavel Rovnaník,et al.  Effect of curing temperature on the development of hard structure of metakaolin-based geopolymer , 2010 .

[27]  Tzong-Horng Liou,et al.  Evolution of chemistry and morphology during the carbonization and combustion of rice husk , 2004 .

[28]  S. Chandrasekhar,et al.  Effect of calcination temperature and heating rate on the optical properties and reactivity of rice husk ash , 2006 .

[29]  J. Davidovits.  PROPERTIES OF GEOPOLYMER CEMENTS , 1994 .

[30]  S. Bernal,et al.  Geopolymers and Related Alkali-Activated Materials , 2014 .

[31]  T. Bakharev,et al.  Durability of Geopolymer Materials in Sodium and Magnesium Sulfate Solutions , 2005 .

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

[33]  K. Sagoe-Crentsil,et al.  Dissolution processes, hydrolysis and condensation reactions during geopolymer synthesis: Part I—Low Si/Al ratio systems , 2007 .

[34]  Ángel Palomo,et al.  Alkali-activated fly ashes: A cement for the future , 1999 .