Effect of GGBFS on setting, workability and early strength properties of fly ash geopolymer concrete cured in ambient condition

Most of the previous works on fly ash-based geopolymers were on the properties of concrete hardened by heat curing, which is considered as a limitation for cast in situ applications at low ambient temperatures. This study aimed to achieve fly ash-based geopolymers suitable for curing without elevated heat. The results show that fly ash based geopolymer concrete for curing in ambient condition can be proportioned for desirable workability, setting time, and compressive strength using ground granulated blast-furnace slag (GGBFS) as a small part of the binder. Inclusion of GGBFS with Class F fly ash helped achieve setting time and compressive strength comparable to those of ordinary Portland cement (OPC).

[1]  Ran Huang,et al.  Binding mechanism and properties of alkali-activated fly ash/slag mortars , 2013 .

[2]  J. Temuujin,et al.  Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes. , 2009, Journal of hazardous materials.

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

[4]  E. Allouche,et al.  Factors affecting the suitability of fly ash as source material for geopolymers , 2010 .

[5]  Toshifumi Sugama,et al.  Acid-resistant cements for geothermal wells: sodium silicate activated slag/fly ash blends , 2005 .

[6]  Keun-Hyeok Yang,et al.  Assessment of CO2 reduction of alkali-activated concrete , 2013 .

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

[8]  J. Ideker,et al.  Advances in alternative cementitious binders , 2011 .

[9]  Prabir Sarker,et al.  Bond strength of reinforcing steel embedded in fly ash-based geopolymer concrete , 2011 .

[10]  S. P. Mehrotra,et al.  Influence of granulated blast furnace slag on the reaction, structure and properties of fly ash based geopolymer , 2010, Journal of Materials Science.

[11]  Á. Palomo,et al.  Compatibility studies between N-A-S-H and C-A-S-H gels. Study in the ternary diagram Na2O–CaO–Al2O3–SiO2–H2O , 2011 .

[12]  P. Sarker,et al.  Fracture behaviour of heat cured fly ash based geopolymer concrete , 2013 .

[13]  C. Shi,et al.  Early strength development and hydration of alkali-activated blast furnace slag/fly ash blends , 1999 .

[14]  V. M. Malhotra,et al.  Introduction: Sustainable Development and Concrete Technology , 2002 .

[15]  B. Vijaya Rangan,et al.  ON THE DEVELOPMENT OF FLY ASH-BASED GEOPOLYMER CONCRETE , 2004 .

[16]  P. Sarker,et al.  Bond Behaviour of Reinforced Fly Ash-Based Geopolymer Concrete Beams , 2009 .

[17]  John L. Provis,et al.  Effect of Calcium Silicate Sources on Geopolymerisation , 2008 .

[18]  Ángel Palomo,et al.  Alkali activation of fly ash: Effect of the SiO2/Na2O ratio Part I: FTIR study , 2007 .

[19]  P. Sarker.  Analysis of geopolymer concrete columns , 2009 .

[20]  Tarun R. Naik,et al.  Sustainability of Concrete Construction , 2008 .

[21]  Ángel Palomo,et al.  Engineering Properties of Alkali-Activated Fly Ash Concrete , 2006 .

[22]  Warren A. Dick,et al.  Alkali-activated complex binders from class C fly ash and Ca-containing admixtures. , 2010, Journal of hazardous materials.

[23]  S. Martínez-Ramírez,et al.  Alkali-activated fly ash/slag cements: Strength behaviour and hydration products , 2000 .

[24]  Sifeng Liu,et al.  Influence of Slag as Additive on Compressive Strength of Fly Ash-Based Geopolymer , 2007 .

[25]  J. Sanjayan,et al.  Behavior of combined fly ash/slag‐based geopolymers when exposed to high temperatures , 2009 .

[26]  Á. Palomo,et al.  Alkaline solution/binder ratio as a determining factor in the alkaline activation of aluminosilicates , 2012 .

[27]  J. Deventer,et al.  Microstructural changes in alkali activated fly ash/slag geopolymers with sulfate exposure , 2013 .

[28]  J. Davidovits.  Geopolymer chemistry and applications , 2008 .

[29]  A. Rashad.  A comprehensive overview about the influence of different admixtures and additives on the properties of alkali-activated fly ash , 2014 .

[30]  M. Blanco-Varela,et al.  Alkaline Activation of Metakaolin: Effect of Calcium Hydroxide in the Products of Reaction , 2004 .

[31]  A. Ashour,et al.  Flow and Compressive Strength of Alkali-Activated Mortars , 2009 .

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

[33]  D. Hardjito.  Studies of fly ash-based geopolymer concrete , 2005 .

[34]  Chai Jaturapitakkul,et al.  NaOH-activated ground fly ash geopolymer cured at ambient temperature , 2011 .

[35]  Djwantoro Hardjito,et al.  Behaviour and Strength of Reinforced Fly Ash-Based Geopolymer Concrete Beams , 2005 .