Alteration in the Microstructure of Fly Ash Geopolymers upon Exposure to Elevated Temperatures

Omar A. Abdulkareem; Mohd Mustafa Al Bakri Abdullah; H. Kamarudin; Khairul Nizar Ismail

doi:10.4028/www.scientific.net/AMR.795.201

Paper Titles

The Comparison between Four PLCC Packages and Eight PLCC Packages in Personal Computer (PC) Using Computational Fluid Dynamic (CFD), FLUENT Software^TM Using Epoxy Moulding Compound Material (EMC)
p.174

The Effect of Rotational Speed on Flow Behavior and Weld Properties in Friction Stir Welding of Pure Aluminum
p.182

Structural Behaviour of Precast Lightweight Foamed Concrete Sandwich Panel (PLFP) with Double Shear Truss Connectors under Axial Load: Preliminary Result
p.190

The Effect of Iron Fillings Waste Contents on the Attenuation Level of Anti-Radiation Shielding Concrete
p.195

Alteration in the Microstructure of Fly Ash Geopolymers upon Exposure to Elevated Temperatures
p.201

Effect of Buffer and pH on the Protein Extraction for Chicken Meat
p.206

The Role of Direct Chilling, Retrogression and Reaging Treatment on Mechanical Properties of High Strength Aluminum Alloy
p.211

Influence of Current Density on Porous Silicon Characteristics
p.219

A Study on the Effect of Modified Electrolyte to the Formation of AAO Membrane in Anodising Process
p.223

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 795Alteration in the Microstructure of Fly Ash...

Alteration in the Microstructure of Fly Ash Geopolymers upon Exposure to Elevated Temperatures

Abstract:

This paper represents the mechanical and microstructure changes in geopolymeric material synthesized by the alkali activation of locally source fly ash at high temperatures of 400, 600 and 800 °C. The high compressive strength of geopolymer cured at 70 °C underwent thermal shrinkage and substantial strength losing at temperatures of 400, 600 °C caused by the high dehydration of the structural water. Exposure to temperature of 800 °C, the geopolymer lost its strength due to extremely densification and expansion processes of the high unreacted silicate phase in the structure. The SEM results showed that the high activator content generated large quantities of unreacted silicate crystals at high temperatures which sintered at range of temperatures of 700-800 °C causing system failure.

You might also be interested in these eBooks

2nd International Conference on Sustainable Materials (ICoSM 2013)

View Preview

Info:

Periodical:

Advanced Materials Research (Volume 795)

Pages:

201-205

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.795.201

Citation:

Cite this paper

Online since:

September 2013

Authors:

Omar A. Abdulkareem, Mohd Mustafa Al Bakri Abdullah, H. Kamarudin, Khairul Nizar Ismail

Keywords:

Elevated Temperatures, Geopolymer, SEM, Strength Loss, Thermal Shrinkage

Export:

RIS, BibTeX

Price:

Permissions:

Request Permissions

References

[1] J. Davidovits, Chemistry of geopolymeric systems, terminology in: proceeding of International Conference on geopolymers, Geopolymer '99 International conference, Geopolymer Institute, France. 32: 9–40 (1999).

Google Scholar

[2] K. Yang, J. Song, and J. Lee. J Mater struct. 43(2010):403-416.

Google Scholar

[3] Z. Li, Z. Ding and Y. Zhang, Development of sustainable cementitious materials in: International Workshop on Sustainable Development and Concrete Technology, edited by K. Wang, Beijing, China, May 20-21(2004).

Google Scholar

[4] S. Wallah and B. Rangan, Low- calcium fly ash based geopolymer concrete: Long-term properties. Research Report GC 2, Curtin University of Technology, Perth,Australia, (2006): p.97.

Google Scholar

[5] J. Gourley and G. Johnson, Developments in geopolymer precast concrete. In: proceeding of fourth World Congress geopolymer, Geopolymer Institute, France. (2005) 133-137.

Google Scholar

[6] ASTM C618-08a, Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete, Annual book of ASTM standard, Philadelphia, USA, 4.02 (2008).

DOI: 10.1520/c0618-99

Google Scholar

[7] S. Hu, J. WU, Y. Wen, Y. HE, W. Fa-Zhou and D. Qing-Jun. J Cent Sou Univer Techno. 16 (2009):914-918.

Google Scholar

[8] W. Rickard, A. van Riessen, P. Walls, Int. J. Appl. Ceram. Technol. 7 (2010) 81–88.

Google Scholar

[9] J. Provis, C. Yong, P. Duxson, J. van Deventer, Colloids Surf. A 336 (2009)57–63.

Google Scholar

[10] P. Duxson, G.C. Lukey, J.S.J. van Deventer, J. Non-Cryst. Solids 352 (2006) 2186–2200.

Google Scholar

[11] W. Rickard, J. Temuujin, A van Riessen, J. Non-Cryst. Solids 385 (2012) 1380- 1389.

Google Scholar