Publication detail

Characterization of alkali activated slag paste after exposure to high temperatures

ROVNANÍK, P. BAYER, P. ROVNANÍKOVÁ, P.

Original Title

Characterization of alkali activated slag paste after exposure to high temperatures

English Title

Characterization of alkali activated slag paste after exposure to high temperatures

Type

journal article - other

Language

en

Original Abstract

The paper covers results on the study of microstructural changes of alkali activated granulated blast furnace slag exposed to high temperatures. Paste prepared from slag activated with solid sodium silicate glass was subjected to temperatures in the range of 200–1200 C for the period of 1 h. The microstructural changes caused by the heat were investigated by means of SEM, HT-XRD analysis and FTIR and MAS NMR spectroscopy. Based on the latter two methods, only partial dehydration and decomposition of C-A-S-H phase can be observed up to 600 C. The principle changes in microstucture of alkali activated slag occur between 600 and 800 C, when the dehydration of C-A-S-H phase is complete and new phases start to crystallize, among which akermanite is dominant. Such a significant phase transformation is reflected in the morphology, pore distribution, and mechanical properties of the AAS paste.

English abstract

The paper covers results on the study of microstructural changes of alkali activated granulated blast furnace slag exposed to high temperatures. Paste prepared from slag activated with solid sodium silicate glass was subjected to temperatures in the range of 200–1200 C for the period of 1 h. The microstructural changes caused by the heat were investigated by means of SEM, HT-XRD analysis and FTIR and MAS NMR spectroscopy. Based on the latter two methods, only partial dehydration and decomposition of C-A-S-H phase can be observed up to 600 C. The principle changes in microstucture of alkali activated slag occur between 600 and 800 C, when the dehydration of C-A-S-H phase is complete and new phases start to crystallize, among which akermanite is dominant. Such a significant phase transformation is reflected in the morphology, pore distribution, and mechanical properties of the AAS paste.

Keywords

slag, alkali activation, water glass, thermal treatment, microstructure

RIV year

2013

Released

01.10.2013

Publisher

Elsevier

ISBN

0950-0618

Periodical

Construction and building materials

Year of study

47

Number

1

State

GB

Pages from

1479

Pages to

1487

Pages count

9

Documents

BibTex 


@article{BUT100658,
  author="Pavel {Rovnaník} and Patrik {Bayer} and Pavla {Rovnaníková}",
  title="Characterization of alkali activated slag paste after exposure to high temperatures",
  annote="The paper covers results on the study of microstructural changes of alkali activated granulated blast furnace slag exposed to high temperatures. Paste prepared from slag activated with solid sodium silicate glass was subjected to temperatures in the range of 200–1200 C for the period of 1 h. The microstructural changes caused by the heat were investigated by means of SEM, HT-XRD analysis and FTIR and MAS NMR spectroscopy. Based on the latter two methods, only partial dehydration and decomposition of C-A-S-H phase can be observed up to 600 C. The principle changes in microstucture of alkali activated slag occur between 600 and 800 C, when the dehydration of C-A-S-H phase is complete and new phases start to crystallize, among which akermanite is dominant. Such a significant phase transformation is reflected in the morphology, pore distribution, and mechanical properties of the AAS paste.",
  address="Elsevier",
  chapter="100658",
  doi="10.1016/j.conbuildmat.2013.06.070",
  institution="Elsevier",
  number="1",
  volume="47",
  year="2013",
  month="october",
  pages="1479--1487",
  publisher="Elsevier",
  type="journal article - other"
}