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2008 | Vol. 55, nr 3-4 | 65-81
Tytuł artykułu

Hydraulic Conductivity and Porosity of Hardening Slurries with Fluidal Fly Ashes in Chemically Aggressive Environments

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Języki publikacji
The article presents the results of hydraulic conductivity and porosity tests of hardening slurries prepared from Portland cement, betonite, water and fluidal fly ashes from combustion of hard and brown coal. In addition, the ashes were in two states of activation: non-activated and mechanically activated. The slurries were exposed to persistent, 160-day filtration of chemically aggressive liquids: distilled water, 0.5% solution of nitric acid and 1% solution of sodium sulphate. A comparative base was composed of samples exposed to filtration of tap water. The research was into relations between hydraulic conductivity and parameters characterizing the porosity structures in slurries, as well as into the influence of sample maturation periods, the state of activation and type of ashes, and the type of aggressive medium on porosity and conductivity of the material. The observed phenomena were typical of materials based on cement binders, and exposed to chemical aggression, e.g. sealing-up of porosity structures in response to sulphate corrosion and de-sealing in response to leaching corrosion, along with effects specific for slurries, such as a decrease of hydraulic conductivity in response to nitric acid solution. A favourable effect of fluidal fly ashes from brown coal was also noted.

Opis fizyczny
Bibliogr. 8 poz., il.
  • University of Technology in Warsaw, Faculty of Environmental Engineering, ul. Nowowiejska 20, 00-653 Warsaw, Poland,
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  • 3. Falaciński P. and Kledyński Z. (2007) Influence of aggressive liquids on hydraulic conductivity of hardening slurries with the addition of different fluidal fly ashes, [in:] Environmental Engineering, Taylor & Francis Group, London, 295–300.
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  • 5. Havlica J., Oder I., Brandstetr J., Mikulikova R. and Walther D. (2004) Cementious materials based on fluidised bed coal combustions ashes, Advances in Cement Research, 16 (2), 61–67.
  • 6. Kledyński Z., Falacinski P. and Ziarkowska K. (2004) Active addition to hardening slurries for cut-off walls in environmental protection structures, Project No. ROW-85-2002, Warsaw.
  • 7. Kledyński Z. (2004) Influence of Fly Ashes on Hardening Slurries Resistance to Sulphate Attack, Archives of Hydro-Engineering and Environmental Mechanics, 51 (2), 119–133.
  • 8. Polish Patent No. 180380, Method and equipment for obtaining binding materials from ashes from power boilers, especially with fluidal furnaces.
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