The Influence of Water Activity on the Hydration Rate of Tricalcium Silicate

Tandre Oey, Aditya Kumar, Gabriel Falzone, Jian Huang, Sierra Kennison, Mathieu Bauchy, Narayanan Neithalath, Jeffrey Bullard, Gaurav Sant

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

Tricalcium silicate does not undergo hydration at relative humidities (RH's) below 80%. But, the rate at which its hydration rate decreases as a function of the RH has not yet been elucidated. By invoking correspondence between RH and water activity (aH, unitless), both of which are related to the chemical potential of water, the reaction evolutions of triclinic tricalcium silicate (i.e., T1‐Ca3SiO5 or C3S) are tracked in water + isopropanol (IPA) mixtures, prepared across a wide range of water activities. Emphasis is placed on quantifying the: (a) rate of hydration as a function of aH, and (b) the critical (initial, aH0c or the achieved) water activity at which hydration effectively ceases, i.e., does not progress; here identified to be ≈ 0.70. The hydration of tricalcium silicate is arrested even when the system remains near saturated with a liquid phase, such that small, if any, capillary stresses develop. This suggests that changes in chemical potential induced via a vapor‐phase or liquid‐phase route both induce similar suppressions of C3S hydration. A phase boundary nucleation and growth (pBNG) model is fit to measured hydration rates from the onset of the acceleration period until well beyond the rate maximum when the water activity is altered. The simulations suggest that for a fixed hydrate nucleation density, any water activity reductions consistently suppress the growth of hydration products. Thermodynamic considerations of how water activity changes may influence reactions/hydrate evolutions are discussed. The outcomes improve our understanding of the chemical factors that influence the rate of Ca3SiO5 hydration.
Original languageEnglish
Pages (from-to)2481-2492
JournalJournal of the American Ceramic Society
Volume99
Issue number7
DOIs
Publication statusPublished - Jul 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Hydration
Silicates
Water
Atmospheric humidity
Chemical potential
Hydrates
Nucleation
Thermodynamic properties
tricalcium silicate
2-Propanol
Phase boundaries
Thermodynamics
Liquids

Cite this

Oey, T., Kumar, A., Falzone, G., Huang, J., Kennison, S., Bauchy, M., ... Sant, G. (2016). The Influence of Water Activity on the Hydration Rate of Tricalcium Silicate. Journal of the American Ceramic Society, 99(7), 2481-2492. https://doi.org/10.1111/jace.14181
Oey, Tandre ; Kumar, Aditya ; Falzone, Gabriel ; Huang, Jian ; Kennison, Sierra ; Bauchy, Mathieu ; Neithalath, Narayanan ; Bullard, Jeffrey ; Sant, Gaurav. / The Influence of Water Activity on the Hydration Rate of Tricalcium Silicate. In: Journal of the American Ceramic Society. 2016 ; Vol. 99, No. 7. pp. 2481-2492.
@article{ecb4f94fc9724e3da9e594e492989734,
title = "The Influence of Water Activity on the Hydration Rate of Tricalcium Silicate",
abstract = "Tricalcium silicate does not undergo hydration at relative humidities (RH's) below 80{\%}. But, the rate at which its hydration rate decreases as a function of the RH has not yet been elucidated. By invoking correspondence between RH and water activity (aH, unitless), both of which are related to the chemical potential of water, the reaction evolutions of triclinic tricalcium silicate (i.e., T1‐Ca3SiO5 or C3S) are tracked in water + isopropanol (IPA) mixtures, prepared across a wide range of water activities. Emphasis is placed on quantifying the: (a) rate of hydration as a function of aH, and (b) the critical (initial, aH0c or the achieved) water activity at which hydration effectively ceases, i.e., does not progress; here identified to be ≈ 0.70. The hydration of tricalcium silicate is arrested even when the system remains near saturated with a liquid phase, such that small, if any, capillary stresses develop. This suggests that changes in chemical potential induced via a vapor‐phase or liquid‐phase route both induce similar suppressions of C3S hydration. A phase boundary nucleation and growth (pBNG) model is fit to measured hydration rates from the onset of the acceleration period until well beyond the rate maximum when the water activity is altered. The simulations suggest that for a fixed hydrate nucleation density, any water activity reductions consistently suppress the growth of hydration products. Thermodynamic considerations of how water activity changes may influence reactions/hydrate evolutions are discussed. The outcomes improve our understanding of the chemical factors that influence the rate of Ca3SiO5 hydration.",
author = "Tandre Oey and Aditya Kumar and Gabriel Falzone and Jian Huang and Sierra Kennison and Mathieu Bauchy and Narayanan Neithalath and Jeffrey Bullard and Gaurav Sant",
year = "2016",
month = "7",
doi = "10.1111/jace.14181",
language = "English",
volume = "99",
pages = "2481--2492",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",
number = "7",

}

Oey, T, Kumar, A, Falzone, G, Huang, J, Kennison, S, Bauchy, M, Neithalath, N, Bullard, J & Sant, G 2016, 'The Influence of Water Activity on the Hydration Rate of Tricalcium Silicate', Journal of the American Ceramic Society, vol. 99, no. 7, pp. 2481-2492. https://doi.org/10.1111/jace.14181

The Influence of Water Activity on the Hydration Rate of Tricalcium Silicate. / Oey, Tandre; Kumar, Aditya; Falzone, Gabriel; Huang, Jian; Kennison, Sierra; Bauchy, Mathieu; Neithalath, Narayanan; Bullard, Jeffrey; Sant, Gaurav.

In: Journal of the American Ceramic Society, Vol. 99, No. 7, 07.2016, p. 2481-2492.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The Influence of Water Activity on the Hydration Rate of Tricalcium Silicate

AU - Oey, Tandre

AU - Kumar, Aditya

AU - Falzone, Gabriel

AU - Huang, Jian

AU - Kennison, Sierra

AU - Bauchy, Mathieu

AU - Neithalath, Narayanan

AU - Bullard, Jeffrey

AU - Sant, Gaurav

PY - 2016/7

Y1 - 2016/7

N2 - Tricalcium silicate does not undergo hydration at relative humidities (RH's) below 80%. But, the rate at which its hydration rate decreases as a function of the RH has not yet been elucidated. By invoking correspondence between RH and water activity (aH, unitless), both of which are related to the chemical potential of water, the reaction evolutions of triclinic tricalcium silicate (i.e., T1‐Ca3SiO5 or C3S) are tracked in water + isopropanol (IPA) mixtures, prepared across a wide range of water activities. Emphasis is placed on quantifying the: (a) rate of hydration as a function of aH, and (b) the critical (initial, aH0c or the achieved) water activity at which hydration effectively ceases, i.e., does not progress; here identified to be ≈ 0.70. The hydration of tricalcium silicate is arrested even when the system remains near saturated with a liquid phase, such that small, if any, capillary stresses develop. This suggests that changes in chemical potential induced via a vapor‐phase or liquid‐phase route both induce similar suppressions of C3S hydration. A phase boundary nucleation and growth (pBNG) model is fit to measured hydration rates from the onset of the acceleration period until well beyond the rate maximum when the water activity is altered. The simulations suggest that for a fixed hydrate nucleation density, any water activity reductions consistently suppress the growth of hydration products. Thermodynamic considerations of how water activity changes may influence reactions/hydrate evolutions are discussed. The outcomes improve our understanding of the chemical factors that influence the rate of Ca3SiO5 hydration.

AB - Tricalcium silicate does not undergo hydration at relative humidities (RH's) below 80%. But, the rate at which its hydration rate decreases as a function of the RH has not yet been elucidated. By invoking correspondence between RH and water activity (aH, unitless), both of which are related to the chemical potential of water, the reaction evolutions of triclinic tricalcium silicate (i.e., T1‐Ca3SiO5 or C3S) are tracked in water + isopropanol (IPA) mixtures, prepared across a wide range of water activities. Emphasis is placed on quantifying the: (a) rate of hydration as a function of aH, and (b) the critical (initial, aH0c or the achieved) water activity at which hydration effectively ceases, i.e., does not progress; here identified to be ≈ 0.70. The hydration of tricalcium silicate is arrested even when the system remains near saturated with a liquid phase, such that small, if any, capillary stresses develop. This suggests that changes in chemical potential induced via a vapor‐phase or liquid‐phase route both induce similar suppressions of C3S hydration. A phase boundary nucleation and growth (pBNG) model is fit to measured hydration rates from the onset of the acceleration period until well beyond the rate maximum when the water activity is altered. The simulations suggest that for a fixed hydrate nucleation density, any water activity reductions consistently suppress the growth of hydration products. Thermodynamic considerations of how water activity changes may influence reactions/hydrate evolutions are discussed. The outcomes improve our understanding of the chemical factors that influence the rate of Ca3SiO5 hydration.

U2 - 10.1111/jace.14181

DO - 10.1111/jace.14181

M3 - Article

VL - 99

SP - 2481

EP - 2492

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

SN - 0002-7820

IS - 7

ER -