THE IMPORTANCE OF FLY ASH PROPERTY IN THE MANUFACTURE OF GEOPOLYMERS
Three typical Class F fly ashes obtained from different Australian power stations were characterized and used to manufacture geopolymer pastes,by activation with NaOH and Na2O· 1.5SiO3 solutions.The particle size distribution and surface area of fly ash are tested to be substantially different when its source varies.The Rietveld refinement XRD shows that the three fly ashes contain different amounts of amorphous phases.By examining the compressive strengths of their resulting geopolymer pastes under different ageing conditions,the surface areas and the amount of amorphous phase are unlikely sufficient to interpret their reactivity under the geopolymerization conditions.More important factors seem to relate to the glass chemistry of fly ash.This preliminary work suggests the requirement of performing more fundamental work on feedstock characterization for the engineered geopolymer manufacturing.
Alkali-activated cement geopolymer fly ash surface area amorphous phase Rietveld refinement XRD
Zuhua Zhang Yingcan Zhu Andre Reid Hao Wang
Centre of Excellence in Engineered Fibre Composites (CEEFC),Faculty of Health,Engineering and Scienc Halok Engineering Pty Ltd.Level 1,162 Boundary Street,West End QLD 4101,Australia
国际会议
长沙
英文
51-61
2014-06-01（万方平台首次上网日期，不代表论文的发表时间）