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Novel hybrid cement based on different mechanisms of setting and hardening

Author(s): J. Strigač, P. Martauz
Paper category: Workshop
Book title: RILEM International workshop on performance-based specification and control of concrete durability
Editor(s): D. Bjegović, H. Beushausen, M. Serdar
ISBN: 978-2-35158-135-3
e-ISBN: 978-2-35158-136-0
Pages: 25 - 31
Total Pages: 7
Language: English

This article deals with the novel hybrid cement H-CEMENT based on different mechanisms of setting and hardening such as hydraulic, geopolymeric, pozzolanic and latent hydraulic. H-CEMENT is produced from various wastes and industrial by-products and with 80 % reduction in CO₂ emissions compared to ordinary Portland cement. The highly effective recovery and safe disposal of industrial by-products such as fly ashes and slags and wastes such as alkaline waste waters from alumina production are closely connected with HCEMENT. Typical feature for H-CEMENT binding phase formation is the combined effect of hydraulic properties of portland clinker, pozzolanic properties of fly ashes, latent hydraulic properties of granulated blast furnace slag and geopolymeric properties coming from alkaline inorganic polycondensing reactions of alumino-silicate materials forming geopolymers activated by an addition of alkaline waste waters separated from the caustic red mud ponds. In the presence of alkali Na⁺, the pH value increases after adding alkaline waste water of red mud origin. This results in fly ashes and slags internal structure dissolution leading in the final effect to geopolymerization. The conjoint Ca(OH)₂ addition originating from portland clinker promotes the running binding reactions of fly ashes and slags.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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