Cristin-resultat-ID: 1075816
Sist endret: 27. august 2014, 08:50
NVI-rapporteringsår: 2013
Resultat
Vitenskapelig artikkel
2014

The effect of heat treatment and cooling rate on the properties of lightweight aggregates

Bidragsytere:
  • Markus Bernhardt
  • Hilde Tellesbø
  • Harald Justnes og
  • Kjell Wiik

Tidsskrift

Journal of the European Ceramic Society
ISSN 0955-2219
e-ISSN 1873-619X
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2014
Publisert online: 2013
Trykket: 2014
Volum: 34
Hefte: 5
Sider: 1353 - 1363
Open Access

Importkilder

Scopus-ID: 2-s2.0-84892481118

Beskrivelse Beskrivelse

Tittel

The effect of heat treatment and cooling rate on the properties of lightweight aggregates

Sammendrag

Lightweight aggregates (LWA) were produced from clay in the laboratory. After firing different heat treatments and cooling rates were applied andthe resulting material was investigated with respect to strength and microstructure. Fast cooling led to the formation of micro cracks and weakenedthe material whereas slow cooling enhanced the strength of LWA. The residence time at temperatures between 700◦C and 900◦C led to differencesin average oxidation state of iron in the matrix phase leading to substantial changes in thermal behaviour of the matrix phase. The combinationof a highly oxidized shell and a reduced core proved to enhance the strength of LWA. A two hour heat treatment at 800◦C in air combined witha subsequent slow cooling rate (0.7◦C/min) applied to LWA produced in an industrial rotary kiln led to a strength increase of 114% compared tomaterial of the normal production without changing any other property.

Bidragsytere

Markus Bernhardt

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Hilde Tellesbø

  • Tilknyttet:
    Forfatter
    ved Weber

Harald Justnes

  • Tilknyttet:
    Forfatter
    ved Arkitektur, byggematerialer og konstruksjoner ved SINTEF AS

Kjell Wiik

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet
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