Coal fly ash processing for its utilization in building materials preparing

• Autorzy: Junak J. , Stevulova N.
• Języki publikacji: EN

Abstrakty

EN

The fly ash from coal combustion processes is a waste very attractive for recycling in the building materials preparing. Presently, a small portion of coal burning products is being utilized for this purpose in Slovakia. Aimed at a wider recycling and exploitation of coal fly ash as siliceous and aluminous substance in the building materials production, the pretreatment of fly ashes is designed for their quality improvement. This paper presents the results of mechanical and chemical activation of coal fly ash regarding the utilization in concrete and cements production. The investigation of physico-mechanical properties of concrete specimens based on mechanically and/or chemically activated coal fly ash as a partial cement replacement (25 wt. %) after 28- and 90 days of hardening showed that the addition the coal fly ash activated under optimal conditions improves the compressive strength of these composites in comparison to concrete with non treated coal fly ash.

Słowa kluczowe

EN

fly ash; utilization; activation; concrete modification

PL

popiół lotny; wykorzystanie; aktywacja; modyfikacja betonu

• Wydawca: Oficyna Wydawnicza Politechniki Rzeszowskiej
• Czasopismo: Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska
• Rocznik: 2009
• Tom: z. 53 [265]
• Strony: 73--78
• Opis fizyczny: Bibliogr. 12 poz.

Twórcy

autor

Junak J.

autor

Stevulova N.

• Technical University of Kosice, Kosice, Slovakia

Bibliografia

• [1] Querol, X., Moreno, N., Umaña, J.C., Alastuey, A, Hermández, E.; Synthesis of zeolites from coal fly ash: an overview. In: International Journal of Coal Geology, vol. 50, 2002, p. 413-423.
• [2] Feuerborn, H. J.: Coal ash utilization over the world and in Europe. Workshop on Environmental and Health Aspects of Coal Ash Utilization, Tel-Aviv, Israel, 2005.
• [3] Mezencevová, A., Števulová, A.: Characterisation of fluidised fly ashes and possibilities of modifications of their properties by mechanical activation. In: Chem. Listy, vol. 96, 2002, p. 515-516.
• [4] Števulová, N., Medzencevová, A.: Fly ash as a raw material in cement industry. In: Zeszyty Naukowe Politechniki Rzeszowskiej, Budownictwo i inżynieria środowiska, part 2 - Environmental Engineering, vol. 37, 2004, p. 407-412.
• [5] Junák, J., Števulová, N.: Alkaline activation of coal fly ash for its utilization in concrete. In: Proc. of Conference ,,Waste Recycling X”, Ostrava: VŠB TU, 2006, p. 167-170.
• [6] Davidovits, J.: ,,Soft Mineralogy and Geopolymers”. Proceedings of the Geopolymer 88. International Conference, the Université de Technologie, Compiègne, France, 1988.
• [7] Davidovits, J.: High-Alkali Cements for 21st Century Concretes. In: Concrete Technology, Past, Present and Future, Proceedings of V. Mohan Malhotra Symposium, Editor: P. Kumar Metha, ACI SP- 144, 1994, p. 383-397.
• [8] Števulová, N.: Coal fly ash utilization in concrete production. In: Selected Scientific Papers, Supplementary Issue, 2005, p. 171-176.
• [9] Števulová, N. et al.: Utilization possibilities of selected wasted kinds in building materials preparing. In: SGEM 2008, Modern management of mine producing, geology and environmental protection, Sofia: SGEM, 2008, p. 193-2008.
• [10] Palomo, A., Grutzek, M.W., Blanco, M.T.: Alkali-activated fly ashes, a cement for the future. In: Cem. Concr. Res., vol. 29, 1999, p. 1323-1329.
• [11] Junák, J., Števulová, N., Kušnierová, M.: An influence of coal fly ash alkaline activation on compressive strength of composites. In: Selected Scientific Papers - Journal of Civil Engineering, vol. 2, 2007, p. 106-113.
• [12] Junák, J., Števulová, N., Sičaková, A.: The temperature influence on final compressive strength of coal fly ash/cement free sample. In: Czasopismo Techniczne, vol. 16, 2008, p. 151-156.