EFFECT OF CALCINATION TEMPERATURE OF THE KAOLIN AND MOLAR Na2O/SiO2 ACTIVATOR RATIO ON PHYSICAL AND MICROSTRUCTURAL PROPERTIES OF METAKAOLIN BASED GEOPOLYMERS

Metakaolinite-based geopolymer has been synthesized at about 25 °C from metakaolin which has been calcined in different temperatures (600-900 °C) and different Na2O/SiO2 ratio activator (0.3-1.1). Compressive strength and microstructure of cement pastes after 7-28 days curing at ambient temperature were measured. Compressive strength tests on the samples showed that the sample made with calcined kaolin at 700 °C and molar ratio of 0.6 has highest average compressive strength of 32 MPa after 28 days of curing. Evaluation of infrared spectroscopy (FTIR) and microstructure showed that geopolymer cement developed and new molecular structure established.

[1]  Antoine Elimbi,et al.  Effects of calcination temperature of kaolinite clays on the properties of geopolymer cements , 2011 .

[2]  Zhang Yunsheng,et al.  Composition design and microstructural characterization of calcined kaolin-based geopolymer cement , 2010 .

[3]  A. Mitrovi.  THERMAL TREATMENT OF KAOLIN CLAY TO OBTAIN METAKAOLIN , 2010 .

[4]  A. Allahverdi,et al.  APPLICATION OF FTIR-SPECTROSCOPY TECHNIQUE IN CHARACTERIZING MOLECULAR STRUCTURE OF NATURAL POZZOLAN-BASED GEOPOLYMER CEMENT , 2009 .

[5]  Li Zongjin.  PREPARATION AND MICROSTRUCTURE OF Na-PSDS GEOPOLYMERIC MATRIX , 2009 .

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

[7]  K. MacKenzie,et al.  Formation of inorganic polymers (geopolymers) from 2:1 layer lattice aluminosilicates , 2008 .

[8]  V. Sirivivatnanon,et al.  Kinetics of geopolymerization: Role of Al2O3 and SiO2 , 2007 .

[9]  K. Mehta.  Reducing the Environmental Impact of Concrete , 2001 .

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

[11]  J.S.J. van Deventer,et al.  Effect of the Alkali Metal Activator on the Properties of Fly Ash-Based Geopolymers , 1999 .

[12]  J. Davidovits.  High-Alkali Cements for 21st Century Concretes , 1994, "SP-144: Concrete Technology: Past, Present, and Future".

[13]  Joseph Davidovits,et al.  GEOPOLYMERS: Man-Made Rock Geosynthesis and the Resulting Development of Very Early High Strength Cement , 1994 .