Publication detail

Influence of secondary raw materials on synthesisof tobermorite in lime–silicate composite

ČERNÝ, V. DROCHYTKA, R. KULÍSEK, K. HÚŠŤAVOVÁ, J.

Original Title

Influence of secondary raw materials on synthesisof tobermorite in lime–silicate composite

Type

conference paper

Language

English

Original Abstract

Crystalline calcium silicate hydrate (CSH) phases, primarily tobermorite, arise in the microstruc-ture of autoclaved aerated concretes (AACs) during autoclaving, which affects the concrete'simportant characteristics. Calcium oxide/hydroxide and silicon oxide are the feedstocks for thehydrothermal reactions. When producing AACs, aside from commonly used raw materials, it isalso possible to utilize secondary raw materials rich in silicon oxide. The use of such secondaryraw materials provides the opportunity for the construction industry to lower its impact on theenvironment. This work describes the investigation of individual added secondary raw materials’influence on the microstructure of AAC. The tested materials were as follows: high-temperaturefly ash, FBC ash, slag, ground container glass, and zeolite. The materials were mixed with quick-lime at a molar ratio of calcium oxide to silicon oxide of 0.73 and 1.0. Autoclave reactors were usedfor the synthesis of tobermorite under laboratory conditions. Autoclaving took place at 170 and190◦C with hydrothermal soaking times of 4, 8, and 16 h. The additive with the most significantimpact on microstructure was fly ash, while ground container glass showed the greatest influenceon mechanical characteristics.

Keywords

autoclaved aerated concrete, fly ash, glass, secondary raw material, zeolite

Authors

ČERNÝ, V.; DROCHYTKA, R.; KULÍSEK, K.; HÚŠŤAVOVÁ, J.

Released

1. 9. 2018

Publisher

Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co

Location

Berlin

ISBN

2509-7075

Periodical

ce/papers

Year of study

2

Number

4

State

Federal Republic of Germany

Pages from

439

Pages to

444

Pages count

6

URL

https://doi.org/10.1002/cepa.842

BibTex

@inproceedings{BUT149520,
  author="Vít {Černý} and Rostislav {Drochytka} and Karel {Kulísek} and Jana {Martanová}",
  title="Influence of secondary raw materials on synthesisof tobermorite in lime–silicate composite",
  booktitle="ICAAC ‐ 6th International Conference on Autoclaved Aerated Concrete",
  year="2018",
  journal="ce/papers",
  volume="2",
  number="4",
  pages="439--444",
  publisher="Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co",
  address="Berlin",
  doi="10.1002/cepa.842",
  issn="2509-7075",
  url="https://doi.org/10.1002/cepa.842"
}