Publication detail

The Influence of Secondary Raw Materials on Tobermorite Formation in Calcium-Silicate Composites

HÚŠŤAVOVÁ, J. ČERNÝ, V. DROCHYTKA, R.

Original Title

The Influence of Secondary Raw Materials on Tobermorite Formation in Calcium-Silicate Composites

Type

journal article in Scopus

Language

English

Original Abstract

The physical-mechanical properties of calcium-silicate composites depend on their microstructure, which itself, in autoclaved aerated concrete especially, depends on the formation and morphology of the calcium hydrosilicate phases. The main one of these phases is tobermorite, which is what this paper is focused on. Two secondary raw materials representing two main groups of by-products are discussed. Namely, these are fluidized bed combustion fly ash and slag produced by the incineration and power plants. Studying the utilisation of secondary raw materials has become a necessity for both environmental and financial reasons. Selected raw materials were mixed with lime only. In this way, the conditions eliminating the effects of other impurities were ensured. The material’s molar ratio of calcium oxide to silicon dioxide was 0.73 and 1.0. The material samples were then autoclaved at two temperatures (170 and 190 °C) and three different hydrothermal durations (4, 8 and 16 hours). The results indicate that slag appears to be promising material. Samples containing slag reached the same compressive strength as reference samples at 190°C with a molar C/S ratio of 0.73.

Keywords

Tobermorite; calcium-silicate composite; fluidized bed combustion fly ash; slag

Authors

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

Released

17. 12. 2018

Publisher

CEMC – České ekologické manažerské centrum, z.s.,

Location

Praha

ISBN

1804-0195

Periodical

Waste forum

Year of study

2018

Number

4

State

Czech Republic

Pages from

467

Pages to

475

Pages count

9

URL

http://www.wasteforum.cz/cisla/WF_4_2018.pdf

BibTex

@article{BUT152027,
  author="Jana {Martanová} and Vít {Černý} and Rostislav {Drochytka}",
  title="The Influence of Secondary Raw Materials on Tobermorite Formation in Calcium-Silicate Composites",
  journal="Waste forum",
  year="2018",
  volume="2018",
  number="4",
  pages="467--475",
  issn="1804-0195",
  url="http://www.wasteforum.cz/cisla/WF_4_2018.pdf"
}