Publication detail

Influence of fluidized bed combustion fly ash admixture on hydrothermal synthesis of tobermorite in the mixture with quartz sand, high temperature fly ash and lime

DROCHYTKA, R. ČERNÝ, V.

Original Title

Influence of fluidized bed combustion fly ash admixture on hydrothermal synthesis of tobermorite in the mixture with quartz sand, high temperature fly ash and lime

Type

journal article in Web of Science

Language

English

Original Abstract

Autoclaved aerated concrete (AAC) microstructure consists of tobermorite, which is formed in the strongly alkaline and hydrothermal environment of the CaO – SiO2 – Al2O3 – H2O system and is the main contributor to the strength of AAC. This paper addresses the influence of fluidized bed combustion fly ash (FBC ash) on the formation of tobermorite, and the properties and structure of autoclaved composite. To give the best account of the influence of individual input materials, tests are conducted on samples without aluminum powder, therefore the samples did not have a porous structure. Quartz sand, high temperature fly ash and lime were used as input materials, FBC ash was used as an admixture (10, 30 and 50%). The main components were mixed to achieve a molar ratio of 0.73 for CaO/SiO2. The hydrothermal reaction was carried out in saturated water vapor at 190 C for 16 h. The main mineralogical phases and microstructure were examined using X-ray diffraction analysis and Scanning Electron Microscope. It was found that fluidized bed combustion fly ash has significant influence on the formation and crystallization of tobermorite and increases compressive strength of the samples of up to 2.5 times after 30 and 50% additions of FBC ash.

Keywords

Autoclaved aerated concrete (AAC), Calcium hydro-silicates (CSH), High temperature fly ash (FA), Quartz sand (QS), Fluidized bed combustion fly ash (FCBA), Molar ratio (C/S), Hydrothermal reaction, Tobermorite

Authors

DROCHYTKA, R.; ČERNÝ, V.

Released

17. 9. 2019

Publisher

Elsevier

ISBN

0950-0618

Periodical

Construction and building materials

Year of study

230

Number

2020

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

11

Pages count

11

URL

https://www.sciencedirect.com/science/article/pii/S0950061819324754

BibTex

@article{BUT161631,
  author="Rostislav {Drochytka} and Vít {Černý}",
  title="Influence of fluidized bed combustion fly ash admixture on hydrothermal synthesis of tobermorite in the mixture with quartz sand, high temperature fly ash and lime",
  journal="Construction and building materials",
  year="2019",
  volume="230",
  number="2020",
  pages="1--11",
  doi="10.1016/j.conbuildmat.2019.117033",
  issn="0950-0618",
  url="https://www.sciencedirect.com/science/article/pii/S0950061819324754"
}