Paper Title:
Understanding Study of Silicate Based Gel Formed during the Setting Ceramic Materials
  Abstract

Consolidation of cementitious and geopolymeric materials involves silicate-based gel formation. This in situ mechanism is difficult to identify because it occurs in a complex and developing system representing only a minority phase. A study based on the behaviour of acidified sodium silicate solutions in alkaline medium, was therefore initiated in order to define the conditions of irreversible setting. A concentrated sodium silicate solution ([Si]=7 mol/l, pH=11.56, Si/Na=1.71) was used as starting solution. 29Si NMR spectroscopy, SAXS and elementary chemical analyses (ICP-AES) were used to characterize the various solutions. Acidification of initial solution, leads in a range of relatively low pH and silicon concentration to various gels formation: (i) reversible transparent gels made up of aggregates of particles (Si7O18H4Na4) and which do not change over time, (ii) soluble white gels that lead to gradual formation of a soluble solid consisting of colloid composition of NaSi1.87O4.24, (iii) “irreversible” gels which provide a syneresis phenomenon leading to formation of a strongly consolidated solid made up of soluble phase rich in sodium similar to white gels (NaSi1.87O4.24) and an insoluble phase type silica of composition NaSi12.66O25.82.

  Info
Periodical
Edited by
Pietro VINCENZINI and Cristina LEONELLI
Pages
51-56
DOI
10.4028/www.scientific.net/AST.69.51
Citation
M. T. Tognonvi, S. Rossignol, J. P. Bonnet, "Understanding Study of Silicate Based Gel Formed during the Setting Ceramic Materials", Advances in Science and Technology, Vol. 69, pp. 51-56, 2010
Online since
October 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: S.B. Cho, Sang Bae Kim, Keon Joon Cho, Y.J. Kim, Tae Hee Lee, Y. Hwang
93
Authors: A.N. Natasha, Iis Sopyan, A. Zuraida
Abstract:Manganese is one of metallic elements which appear in biological apatite like bone and teeth. Its important effect on the growth and...
1185
Authors: Jiao Jiao Wang, Chun Ying Han, Li Dan Zhang
Chapter 1: Materials Properties
Abstract:In this paper, research was focused on the synthesis of a new efficient coagulant, boron -containing poly-silicate zinc (PSZB).The effect of...
543
Authors: Dan Nicolae Ungureanu, Nicolae Angelescu, Adrian Catangiu, Elena Valentina Stoian, Cristiana Zizi Rizescu, Daniela Avram
Abstract:Bioactive glasses based on SiO2-CaO-P2O5 system have been synthesized by sol – gel process. The powder glass...
21
Authors: Bo Tao Qin, Lei Lin Zhang, Yi Lu
Chapter 22: Mine Survey, Safety and Prediction Engineering
Abstract:In order to prevent the spontaneous combustion of coal efficaciously, a kind of new compound material of multi-phase foamed gel, which is...
3678