THE REUSE OF COAL FLY ASH IN GEOPOLYMER CONCRETE: INFLUENCE OF THE ACTIVATOR ON THE GEL COMPOSITION
The alkali activation of waste materials has become an important area of research due to its potential to synthesize, at ambient or low temperature conditions, a binder with similar properties as Portland cement but without the drawback linked to greenhouse gas emissions. Coal fly ash has been used for the synthesis of geopolymers using sodium silicate and a mixture of sodium silicate and sodium hydroxide as alkaline activators. One sample was activated only with sodium silicate while the second sample used a mixture 50:50 of sodium silicate and 8 m NaOH solution. The effect of the activator on the gel composition was investigated by quantitative analysis run with a FEI Quanta 200 using ZAF matrix corrections. The (Na+K)/Al and Si/Al atomic ratios of the gels activated with sodium silicate are 0.404 and 5.547; and 0.588 and 3.71 with addition of NaOH. The gel composition analyzed in the sample activated with the mixture of sodium silicate and NaOH is enriched in Na and Al. In that sample, the fly ash reaction rate is more advanced considering that the gel is richer in Al and that this element results from the fly ash.
Fly ash Geopolymer Alkaline activator Aluminosilicate material Industrial solid-waste
J. DUCHESNE L. DUONG T. BOSTROM
Université Laval, Québec city, Canada Queensland University of Technology, Brisbane, Australia
国际会议
北京
英文
293-298
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）