Solubility reactions of cement components with NaCl solutions: I. Ca(OH)(2) and C-S-H

F P Glasser, J Pedersen, K Goldthorpe, M Atkins

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Synthetic calcium silicate hydrogels, of Ca/Si mole ratios 0.85, 1.10, 1.40 and 1.80, were prepared and homogenised at 25 degrees C Solubilities of Ca(OH)(2) and of C-S-H were measured in initially pure water at 25, 55 and 85'C. Equilibration times ranged from a few days up to 9 months: data are presented for the longer reaction times, 4.5 to 9 months. These solids were also equilibrated with NaCl solutions, approximately 0.5, 1.0 and 1.5 mol/l, at 25, 55 and 85 degrees C. The expected solubility trends emerge in initially pure water: C-S-H dissolved incongruently and Ca solubilities decreased with either rising temperature or at lower Ca : Si molar ratios. The presence of NaCl enhanced Ca solubilities, especially in the range 0-0.5mol/l NaCl. However pH remained almost unaffected, 0.1 unit, as a function of NaCl concentration, other factors remaining constant. The C-S-H gel partially crystallised in the course of solubility determinations made at 85 degrees C. Sorption of NaCl on C-S-H was negligible. Comments on the experimental procedures and quality of data are made. The long-term durability of cement exposed to dissolution in NaCl solutions is discussed.

Original languageEnglish
Pages (from-to)57-64
Number of pages8
JournalAdvances in Cement Research
Volume17
Publication statusPublished - 2005

Keywords

  • SILICATE
  • BINDING
  • WATER
  • GELS

Cite this

Glasser, F. P., Pedersen, J., Goldthorpe, K., & Atkins, M. (2005). Solubility reactions of cement components with NaCl solutions: I. Ca(OH)(2) and C-S-H. Advances in Cement Research, 17, 57-64.

Solubility reactions of cement components with NaCl solutions: I. Ca(OH)(2) and C-S-H. / Glasser, F P ; Pedersen, J ; Goldthorpe, K ; Atkins, M .

In: Advances in Cement Research, Vol. 17, 2005, p. 57-64.

Research output: Contribution to journalArticle

Glasser, FP, Pedersen, J, Goldthorpe, K & Atkins, M 2005, 'Solubility reactions of cement components with NaCl solutions: I. Ca(OH)(2) and C-S-H', Advances in Cement Research, vol. 17, pp. 57-64.
Glasser, F P ; Pedersen, J ; Goldthorpe, K ; Atkins, M . / Solubility reactions of cement components with NaCl solutions: I. Ca(OH)(2) and C-S-H. In: Advances in Cement Research. 2005 ; Vol. 17. pp. 57-64.
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T1 - Solubility reactions of cement components with NaCl solutions: I. Ca(OH)(2) and C-S-H

AU - Glasser, F P

AU - Pedersen, J

AU - Goldthorpe, K

AU - Atkins, M

PY - 2005

Y1 - 2005

N2 - Synthetic calcium silicate hydrogels, of Ca/Si mole ratios 0.85, 1.10, 1.40 and 1.80, were prepared and homogenised at 25 degrees C Solubilities of Ca(OH)(2) and of C-S-H were measured in initially pure water at 25, 55 and 85'C. Equilibration times ranged from a few days up to 9 months: data are presented for the longer reaction times, 4.5 to 9 months. These solids were also equilibrated with NaCl solutions, approximately 0.5, 1.0 and 1.5 mol/l, at 25, 55 and 85 degrees C. The expected solubility trends emerge in initially pure water: C-S-H dissolved incongruently and Ca solubilities decreased with either rising temperature or at lower Ca : Si molar ratios. The presence of NaCl enhanced Ca solubilities, especially in the range 0-0.5mol/l NaCl. However pH remained almost unaffected, 0.1 unit, as a function of NaCl concentration, other factors remaining constant. The C-S-H gel partially crystallised in the course of solubility determinations made at 85 degrees C. Sorption of NaCl on C-S-H was negligible. Comments on the experimental procedures and quality of data are made. The long-term durability of cement exposed to dissolution in NaCl solutions is discussed.

AB - Synthetic calcium silicate hydrogels, of Ca/Si mole ratios 0.85, 1.10, 1.40 and 1.80, were prepared and homogenised at 25 degrees C Solubilities of Ca(OH)(2) and of C-S-H were measured in initially pure water at 25, 55 and 85'C. Equilibration times ranged from a few days up to 9 months: data are presented for the longer reaction times, 4.5 to 9 months. These solids were also equilibrated with NaCl solutions, approximately 0.5, 1.0 and 1.5 mol/l, at 25, 55 and 85 degrees C. The expected solubility trends emerge in initially pure water: C-S-H dissolved incongruently and Ca solubilities decreased with either rising temperature or at lower Ca : Si molar ratios. The presence of NaCl enhanced Ca solubilities, especially in the range 0-0.5mol/l NaCl. However pH remained almost unaffected, 0.1 unit, as a function of NaCl concentration, other factors remaining constant. The C-S-H gel partially crystallised in the course of solubility determinations made at 85 degrees C. Sorption of NaCl on C-S-H was negligible. Comments on the experimental procedures and quality of data are made. The long-term durability of cement exposed to dissolution in NaCl solutions is discussed.

KW - SILICATE

KW - BINDING

KW - WATER

KW - GELS

M3 - Article

VL - 17

SP - 57

EP - 64

JO - Advances in Cement Research

JF - Advances in Cement Research

SN - 0951-7197

ER -