Publication detail

Influence of Use Fluidized Fly Ash Combined with High Temperature Fly Ash on Microstructure of Cement Composite

OSUSKÁ, L. HELA, R. ŤAŽKÝ, M.

Original Title

Influence of Use Fluidized Fly Ash Combined with High Temperature Fly Ash on Microstructure of Cement Composite

Type

conference paper

Language

English

Original Abstract

The constraint of using fluidized bed combustion fly ash as addition for concrete is mainly its chemical composition. Increased contents of sulphates and free lime in fluidized bed combustion fly ash causes development of undesirable ettringite during hydration. Expansive character of this mineral can have degrading effect on hardened concrete. Fluidized bed combustion fly ash as well as high temperature fly ash are considered pozzolanic addition, which is capable of reacting with Ca(OH)2 and form similar hydration products as cement hydration. Use of small amount of fluidized bed combustion fly ash can cause production of ettringite, however, when combined with high temperature fly ash, possible micro-failures could be healed with new hydration products - CSH gels. The paper deals with possibilities of confirming this theory mainly through examination of microstructure of cement composite with an electron microscope and clarifying observed hydration products.

Keywords

CSH Gel, Ettringite, Fluidized Bed Combustion Fly Ash, High Temperature Fly Ash, Microstructure

Authors

OSUSKÁ, L.; HELA, R.; ŤAŽKÝ, M.

Released

1. 12. 2016

Publisher

Trans Tech Publication

Location

Switzerland

ISBN

9783035710793

Book

Key Engineering Materials

ISBN

1013-9826

Periodical

Key Engineering Materials (print)

Number

722

State

Swiss Confederation

Pages from

146

Pages to

150

Pages count

5

BibTex

@inproceedings{BUT129276,
  author="Lucia {Ťažká} and Rudolf {Hela} and Martin {Ťažký}",
  title="Influence of Use Fluidized Fly Ash Combined with High Temperature Fly Ash on Microstructure of Cement Composite",
  booktitle="Key Engineering Materials",
  year="2016",
  journal="Key Engineering Materials (print)",
  number="722",
  pages="146--150",
  publisher="Trans Tech Publication",
  address="Switzerland",
  doi="10.4028/www.scientific.net/KEM.722.146",
  isbn="9783035710793",
  issn="1013-9826"
}