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Silicate species of water glass and insights for alkali-activated green cement

Journal article
Authors Helén Jansson
Diana Bernin
K. Ramser
Published in AIP Advances
Volume 5
Issue 6
Pages article no. 067167
ISSN 2158-3226
Publication year 2015
Published at Swedish NMR Centre at Göteborg University
Pages article no. 067167
Language en
Links dx.doi.org/10.1063/1.4923371
https://gup.ub.gu.se/file/200658
Subject categories Nuclear physics

Abstract

Despite that sodium silicate solutions of high pH are commonly used in industrial applications, most investigations are focused on low to medium values of pH. Therefore we have investigated such solutions in a broad modulus range and up to high pH values (∼14) by use of infrared (IR) spectroscopy and silicon nuclear magnetic resonance (29Si-NMR). The results show that the modulus dependent pH value leads to more or less charged species, which affects the configurations of the silicate units. This in turn, influences the alkali-activation process of low CO2 footprint cements, i.e. materials based on industrial waste or by-products.

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