Scholarly record
COAL FLY ASH BENEFIT AND ITS UTILIZATION IN CONCRETE
Abstract
The incorporation of industrial by-products such as fly ash, slag, silica fume in concrete can significantly enhance its basic properties in both the fresh and hardened states. These materials greatly improve the durability of concrete through control of high thermal gradients, pore refinement, depletion of cement alkalis, resistance to chloride and sulphate penetration, and continued microstructural development through a longterm hydration and pozzolanic reaction. The utilisation of by-products as the partial replacement of cement has important economical, environmental and technical benefits such as the reduced amount of waste materials, cleaner environment, reduced energy requirement, durable service performance during service life and cost-effective structures. In this paper the experimental results of cement replacement by coal fly ash in the mixture are presented. Also an influence of alkaline activation of coal fly ash type from classical incineration of brown coal on strength characteristics development of hardened concrete sample is shown there. From evaluation of experimental results follows, that this information can be used for preparing the standards and landfill waste material utilization in concrete production with strength classes C 20/25 and C 25/30.
Publication details
References9
Querol, X. & Moreno, N. & Umana, 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.
Feuerbom, 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.
Mezencevová, A. & Stevulová, A. Characterisation of fluidised fly ashes and possibilities of modifications of their properties by mechanical activation. In: Chem. Listy, vol. 96, 2002, p. 5 1 5-5 1 6.
Stevulová, ?. & Medzencevová, A. Fly ash as a raw material in cement industry. In: Szesyty Naukowe Politechniki Rzesowskiej, Budownictwo i inzynieria srodowiska, part 2 - Environmental Engineerging, vol. 37, 2004, p. 407-412.
Junák, J. & Stevulová, ?. Alkaline activation of coal fly ash for its utilization in concrete. In: Proc. of Conference "Waste Recycling X", Ostrava: VSB TU, 2006, p. 167-170.
Davidovits, J. "Soft Mineralogy and Geopolymers". Proceedings of the Geopolymer 88.International Conference, the Université de Technologie, Compiègne, France, 1988.
Davidovits, J. High-Alkali Cements for 2 1st 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.
Palomo, A. & Grutzek, M.W. & Blanco, M.T. Alkali-activated fly ashes, a cement for the future. In: Cem. Concr. Res., vol. 29, 1 999, p. 1 323- 1 329.
Junák, J. & Stevulová, ?. & Kusnierová, 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. 106-1 13.
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.