Comparative study of illite clay and illite-based geopolymer products

Quaternary (Q-clay) clayey deposits are one of the dominating parts of mineral raw materials of the sedimentary cover at present area of Latvia. These clays can be characterised by illite content up to 75-80 %. Two ways for use of illite clays were studied: conventional and geopolymers method. Purpo...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2011-10, Vol.18 (22), p.222027-4
Main Authors: Sperberga, I, Sedmale, G, Stinkulis, G, Zeila, K, Ulme, D
Format: Article
Language:English
Subjects:
Absorption spectra
Aluminum
Banded structure
Bulk density
Clay
Clay minerals
Comparative studies
Compressive strength
Coordination numbers
Geopolymers
Illite
Infrared spectroscopy
Pore size distribution
Raw materials
Temperature dependence
Transformations
Vibration
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Summary:Quaternary (Q-clay) clayey deposits are one of the dominating parts of mineral raw materials of the sedimentary cover at present area of Latvia. These clays can be characterised by illite content up to 75-80 %. Two ways for use of illite clays were studied: conventional and geopolymers method. Purpose of the second mentioned method was showing the influence of alkali (KOH) on the transformation of Q-clay/illite structure. Obtained products were investigated by IR–spectroscopy, DTA and XRD, pore size distribution was determined as well. Some ceramic properties and compressive strength were determined and compared. IR-spectrum showed the effect of alkali on the transformation of Q-clay/illite structure in three main absorption bands: 3620-3415 cm−1 which is related to the vibrational modes of adsorbed water between SiO4 and AlO6 layers; new stronger absorption bands at 1635 cm−1 and 1435 cm−1 indicate on the appearance of vibrations in Q-KOH and are related to the K-O-Si bonds; the most essential changes are vibrations at 850 cm−1 showing the changes in the coordination number of Al from 6 to 4 for Q-KOH. Investigations of the bulk density in dependence on temperature showed the small increase of bulk density for Q-clay while - the relatively remarkable decrease for Q-clay/KOH. Mentioned values correlate with the compressive strength of Q-clay and Q-KOH products.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/18/22/222027