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Crystallization‐induced stabilization of foam glass aggregates for heat‐insulating concrete
Author(s) -
Kazantseva Lidia K.,
Mikhno Anastasia O.,
Miroshnichenko Leonid V.
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13771
Subject(s) - materials science , crystallization , porous glass , aluminosilicate , alkali metal , silicate , scanning electron microscope , leaching (pedology) , composite material , porosity , sodium silicate , chemical engineering , mineralogy , biochemistry , chemistry , physics , environmental science , quantum mechanics , soil science , engineering , soil water , catalysis
Resistance of the porous glass‐based aggregates to alkali‐silicate reaction (ASR) was the focus of this study. ASR was studied in mixtures of aggregates with water alkali solutions simulating alkali media of row concrete. Granular foam glass with homogeneous glass in the pore walls is ASR‐active, which leads to the leaching of glass and to the formation of hydrated Na‐silicate gel, Ca‐silicate, and aluminosilicate on the aggregate surfaces. Mitigation of ASR‐activity in granular foam glass was achieved by thermo‐induced crystallization (850‐900ºC) of micro‐ and nanoscale crystals (Na 4 CaSi 3 O 9 and/or Na 2 Ca 3 Si 6 O 16 ) in the pore walls with the formation of granular glass‐ceramic foams. The main characterization methods were scanning electron microscopy, x‐ray powder diffraction analysis, x‐ray fluorescence, atomic emission spectrometry, and pH analysis.