Publication detail

The Influence of Secondary Raw Materials on the Microstructure and Physical-Mechanical Properties of Autoclaved Aerated Concrete

ŠEBESTOVÁ, P. ČERNÝ, V. DROCHYTKA, R.

Original Title

The Influence of Secondary Raw Materials on the Microstructure and Physical-Mechanical Properties of Autoclaved Aerated Concrete

Type

journal article in Scopus

Language

English

Original Abstract

Using secondary raw materials is both eco-friendly and cost-effective. Great amounts of secondary raw materials are produced in the power industry by solid fuel combustion. There are two types of ashes, high temperature fly ash and fluidised bed combustion ash in this industry. As opposed to high temperature fly ash, the fluidised bed combustion ash generated by the more energy-efficient and modern combustion is still little used. High-temperature incineration also produces a slag beside fly ash, which has potential for use in aerated concrete. For this reason, research is focused on fluidised bed combustion fly ash, fluidised bed combustion bottom ash and slag. The aerated concrete composite was developed using a laboratory autoclave operating at 190 °C over a 7-hour holding time. The secondary raw materials amounted to 10 %, 30 %, and 50 % of the aerated concrete. While fresh, the mixtures were tested for rheologic properties by the flow table test. The results showed a dependence of rheological properties on the content of fluidised bed combustion fly and bottom ash. The research showed that a 10% content of secondary raw materials is to no detriment to physical properties. The influence of secondary raw materials on the microstructure was examined by X-ray diffraction analysis and compared to the peak intensity of the tobermorite which is the carrier of the autoclaved aerated concrete. The intensity peak of the sample with 10% admixture of fluidised bed combustion fly and bottom ash comparable to the reference sample and corresponded to the results of the physical properties.

Keywords

Autoclaved aerated concrete, fluidised bed combustion fly ash, fluidised bed combustion bottom ash, slag, rheology

Authors

ŠEBESTOVÁ, P.; 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

476

Pages to

483

Pages count

8

URL

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

BibTex

@article{BUT152520,
  author="Pavlína {Ondříčková} and Vít {Černý} and Rostislav {Drochytka}",
  title="The Influence of Secondary Raw Materials on the Microstructure and Physical-Mechanical Properties of Autoclaved Aerated Concrete",
  journal="Waste forum",
  year="2018",
  volume="2018",
  number="4",
  pages="476--483",
  issn="1804-0195",
  url="http://www.wasteforum.cz/cisla/WF_4_2018.pdf"
}