A thermodynamic model for C-(N-)A-S-H gel: CNASH_ss. Derivation and validation

By R. Myers, S. A. Bernal, J. Provis. 2014

277 citations recorded by the source corpus.

The main reaction product in Ca-rich alkali-activated cements and hybrid Portland cement (PC)-based materials is a calcium (alkali) aluminosilicate hydrate (C-(N-)A-S-H) gel. Thermodynamic models without explicit definitions of structurally-incorporated Al species have been used in numerous past studies to describe this gel, but offer limited ability to simulate the chemistry of blended PC materials and alkali-activated cements. Here, a thermodynamic model for C-(N-)A-S-H gel is derived and parameterised to describe solubility data for the CaO–(Na2O,Al2O3)–SiO2–H2O systems and alkali-activated slag (AAS) cements, and chemical composition data for C-A-S-H gels. Simulated C-(N-)A-S-H gel densities and molar volumes are consistent with the corresponding values reported for AAS cements, meaning that the model can be used to describe chemical shrinkage in these materials. Therefore, this model can provide insight into the chemistry of AAS cements at advanced ages, which is important for understanding the long-term durability of these materials.

Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/64b8373d0a6bfcdc09b3c768fc8a5280f06921d0

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Building and Construction

1. J. Provis
2. S. A. Bernal
3. R. Myers
4. B. Lothenbach
5. T. Luukkonen
6. J. Yliniemi
7. U. Lassi
8. Janne Pesonen

In Civil and Structural Engineering

1. J. Provis
2. S. A. Bernal
3. R. Myers
4. B. Lothenbach
5. T. Luukkonen
6. J. Yliniemi
7. U. Lassi
8. Janne Pesonen

In Materials Chemistry

1. J. Provis
2. S. A. Bernal
3. R. Myers
4. B. Lothenbach
5. T. Luukkonen
6. J. Yliniemi
7. U. Lassi
8. Janne Pesonen

Citations in the corpus

• Thermodynamic modelling of alkali-activated slag cements (2015, methodology): “, 2008) C-(N-)A-S-H gel ideal solid solution end-members, ‘CNASH_ss’ (Myers et al., 2014) 5CA, C1.”
• Application of alkali-activated materials for water and wastewater treatment: a review (2019, background): “H gel), on the other hand, consists of cross-linked and non-cross linked structures resembling tobermorite (Bernal et al. 2014a; Myers et al. 2013, 2014; Walkley et al. 2016).”