Publication detail

The influence of the waste foundry sand on the microstructure and the physico-mechanical properties of autoclaved aerated concrete

MELICHAR, J. ČERNÝ, V. DROCHYTKA, R.

Original Title

The influence of the waste foundry sand on the microstructure and the physico-mechanical properties of autoclaved aerated concrete

Type

conference paper

Language

English

Original Abstract

Thanks to its porous structure the autoclaved aerated concrete has excellent thermal insulation properties. The production of this building material is carried out in two main steps. At first calcium hydroxide reacts with aluminum powder. This reaction releases hydrogen which creates the porous structure. Secondly lime reacts with siliceous components under hydrothermal conditions. This reaction forms crystalline calcium hydrosilicates which represent a binder component in the material. Focus of this paper is to study the degree of crystallization of calcium hydrosilicates depending on the quantity and fineness of the admixture of the waste foundry sand. This material was tested in three different values of specific surface. The influence of granularity of the waste foundry sand on the microstructure and physical-mechanical properties of the autoclaved aerated concrete was monitored. At the same time, the influence primary filler substitution by foundry sand was also observed.The substitution was realized in amounts of 10%, 30% and 50%. As the final step the influence of the waste foundry sand admixture on the autoclaved aerated concrete porous structure was evaluated. The microstructure was analyzed by X-ray diffraction. Obtained values show that admixture of waste foundry sand has positive effect on the crystallisation of calcium hydosilicate phases. Substitution of primary filler by waste foundry sand is possible up to 50%. With a higher amount of substitution, the higher values of compressive strength of autoclaved aerated concrete were monitored.

Keywords

Waste foundry sand, autoclaved aerated concrete, aluminum powder, calcium hydrosilicate, tobermorite

Authors

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

Released

30. 6. 2020

Location

Switzerland

ISBN

978-3-0357-1606-1

Book

8th International Conference on Material Science and Engineering Technology, ICMSET 2019

ISBN

0255-5476

Periodical

Materials Science Forum

Year of study

2020

Number

998

State

Swiss Confederation

Pages from

293

Pages to

298

Pages count

6

URL

https://www.scientific.net/MSF.998.293

BibTex

@inproceedings{BUT161643,
  author="Jindřich {Melichar} and Vít {Černý} and Rostislav {Drochytka}",
  title="The influence of the waste foundry sand on the microstructure and the physico-mechanical properties of autoclaved aerated concrete",
  booktitle="8th International Conference on Material Science and Engineering Technology, ICMSET 2019",
  year="2020",
  journal="Materials Science Forum",
  volume="2020",
  number="998",
  pages="293--298",
  address="Switzerland",
  doi="10.4028/www.scientific.net/MSF.998.293",
  isbn="978-3-0357-1606-1",
  issn="0255-5476",
  url="https://www.scientific.net/MSF.998.293"
}