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ROVNANÍK, P. BAYER, P. ROVNANÍKOVÁ, P.
Original Title
Characterization of alkali activated slag paste after exposure to high temperatures
English Title
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
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" }