Publication detail

Quality of the structure of ash bodies based on different types of ash

ČERNÝ, V.

Original Title

Quality of the structure of ash bodies based on different types of ash

Type

journal article in Web of Science

Language

English

Original Abstract

Artificial aggregates based on the self-firing process are often produced with an outdated technology without innovations and research. The knowledge of the production of ceramic materials is useful, but fly ash is quite a heterogeneous material influenced by the thermal processes occurring during the production; therefore, this problem has to be solved. The aim of the research work was to evaluate the influence of the character of fly ash on the formation, structure and properties of a sintered fly-ash body using laboratory firings. The main difference as regards the behavior is between the fly ash originating from high temperature and the one originating from fluidized-bed combustion. While the first type of ash contains mainly mullite and other high-temperature minerals, the fluidized-bed-combustion ash contains mainly anhydrite and free lime. These increase, for example, the manipulation strength of a fly-ash mix, but they also increase the amount of mixing water and weaken a sintered fly-ash body. The content of Fe2O3 and its modifications and the proportion of SiO2 in the amorphous phase or mullite are important parameters for evaluating various types of high-temperature combustion fly ashes. The content of Fe2O3 together with carbon finally works as a very effective fluxing agent. Thus, the surface of a specimen was sintered and the swelling was considerable due to the product gases of CO and CO2. A higher proportion of SiO2 contained in the amorphous phase increases the strength and the quality of a fly-ash body. A higher proportion of SiO2 in the crystal phase requires a higher amount of heat for obtaining a solid structure.

Keywords

Artificial aggregate; Bottom ash; Clinkering; FBC ash; Fly ash; Sintering

Authors

ČERNÝ, V.

RIV year

2015

Released

14. 9. 2015

Publisher

IMT

Location

Slovenija

ISBN

1580-2949

Periodical

Materiali in tehnologije

Year of study

49

Number

4

State

Republic of Slovenia

Pages from

601

Pages to

605

Pages count

5

URL

http://mit.imt.si/Revija/izvodi/mit154/cerny.pdf

BibTex

@article{BUT116457,
  author="Vít {Černý}",
  title="Quality of the structure of ash bodies based on different types of ash",
  journal="Materiali in tehnologije",
  year="2015",
  volume="49",
  number="4",
  pages="601--605",
  doi="10.17222/mit.2014.207",
  issn="1580-2949",
  url="http://mit.imt.si/Revija/izvodi/mit154/cerny.pdf"
}