Factors Influence on Shrinkage of High Calcium Fly Ash Geopolymer Paste

Abstract:

This research shows the progress of geopolymer synthesis based on high calcium fly ash. In this study, the fly ash contents of 60, 65, and 70 percents by weight and sodium hydroxide solution concentrations of 8 to 12 M were used. Alkali activators for the geopolymer synthesis consisted of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) and the weight ratio of Na2SiO3 to NaOH were 0.50, 1.00, and 1.50. Drying shrinkage deformation of geopolymer paste was investigated by longitudinal measurement in a room temperature. Generally, the drying shrinkage behavior could be divided into three groups. The minimum drying shrinkage strain below 3,000 x 10-6 mm/mm was observed. The results indicated that an increase in the fly ash to alkali solution ratio and the decease of NaOH concentration significantly decreased the drying shrinkage strain. The optimum ratio of Na2SiO3 to NaOH was 1.0. The findings show that high calcium fly ash geopolymer binder could be used for alternative construction materials with low shrinkage strain.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 2275-2281
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.2275
• Online since: December 2012
• Authors: Parames Kamhangrittirong*, Prasert Suwanvitaya, Watcharin Witayakul, Patcharaporn Suwanvitaya, Prinya Chindaprasirt
• Keywords: Drying Shrinkage, Geopolymer, High Calcium Fly Ash, Sodium Hydroxide, Sodium Silicate

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