Comparative investigation of reactivity of different kinds of fly ash in alkaline media
Iwona Wilińska , Barbara Pacewska
AbstractComparison of the influence of temperature and different alkali activators on the reactivity of two types of fly ash(conventional, fluidized) was presented. The main emphasis was put on fluidized fly ash as potential component of bindingmixtures containing low amount of cement. Conventional fly ash was used as a reference. It was found that for thesematerials the key differences affecting products of activation are: availability of calcium and sulfate ions as well asstructure of fly ash grains influencing dissolution of aluminate and silicate species. Fluidized fly ash, contrary to con-ventional fly ash, undergoes reaction in 0.1 M solutions of hydroxides forming mainly ettringite. In the case of 4 Mhydroxides, both fly ashes undergo hydration processes. Conventional fly ash formed mainly amorphous aluminosilicategel, while fluidized fly ash may create zeolitic products especially in the case of elevated temperature of early hydration.Sulfate and alkali ions can be incorporated into aluminosilicate structure of new formed products; however, this processdepends strictly on the type of used hydroxide and its concentration. The presence of Ca(OH)2, carbonates and alkalisulfates was also registered in the case of hydrated fluidized fly ash.
|Journal series||Journal of Thermal Analysis and Calorimetry, ISSN 1388-6150, (A 20 pkt)|
|Keywords in English||fly ash, activation, hydration, thermal analysis, infrared spectroscopy|
|Score||= 20.0, 20-05-2019, ArticleFromJournal|
|Publication indicators||: 2017 = 1.073; : 2017 = 2.209 (2) - 2017=1.917 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.