skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Confined Water in Layered Silicates: The Origin of Anomalous Thermal Expansion Behavior in Calcium-Silicate-Hydrates

Journal Article · · ACS Applied Materials and Interfaces

Water, under conditions of nanoscale confinement, exhibits anomalous dynamics, and enhanced thermal deformations, which may be further enhanced when such water is in contact with hydrophilic surfaces. Such heightened thermal deformations of water could control the volume stability of hydrated materials containing nanoconfined structural water. Understanding and predicting the thermal deformation coefficient (TDC, often referred to as the CTE, coefficient of thermal expansion), which represents volume changes induced in materials under conditions of changing temperature, is of critical importance for hydrated solids including: hydrogels, biological tissues, and calcium silicate hydrates, as changes in their volume can result in stress development, and cracking. By pioneering atomistic simulations, we examine the physical origin of thermal expansion in calcium-silicate-hydrates (C–S–H), the binding agent in concrete that is formed by the reaction of cement with water. We report that the TDC of C–S–H shows a sudden increase when the CaO/SiO2 (molar ratio; abbreviated as Ca/Si) exceeds 1.5. This anomalous behavior arises from a notable increase in the confinement of water contained in the C–S–H’s nanostructure. We identify that confinement is dictated by the topology of the C–S–H’s atomic network. Altogether, the results suggest that thermal deformations of hydrated silicates can be altered by inducing compositional changes, which in turn alter the atomic topology and the resultant volume stability of the solids.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1394590
Journal Information:
ACS Applied Materials and Interfaces, Vol. 8, Issue 51; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

References (49)

Confined Water Dissociation in Microporous Defective Silicates: Mechanism, Dipole Distribution, and Impact on Substrate Properties journal January 2012
Molecular Mechanisms Causing Anomalously High Thermal Expansion of Nanoconfined Water journal October 2008
Anomalous composition-dependent dynamics of nanoconfined water in the interlayer of disordered calcium-silicates journal February 2014
Glassy Nature of Water in an Ultraconfining Disordered Material: The Case of Calcium−Silicate−Hydrate journal March 2011
Two-Dimensional Material Confined Water journal December 2014
Thermal Expansion of Confined Water journal May 2009
Water Nanoconfinement Induced Thermal Enhancement at Hydrophilic Quartz Interfaces journal December 2009
Structural determinants of water permeation through aquaporin-1 journal October 2000
Nanoconfinement controls stiffness, strength and mechanical toughness of β-sheet crystals in silk journal March 2010
Effects of nanoconfinement on the morphology and reactivity of organic materials journal January 2005
Nanoconfinement effects in energy storage materials journal January 2011
Thermodynamic functions of water and ice confined to 2nm radius pores journal March 2005
Nanoconfined Water in Magnesium-Rich 2:1 Phyllosilicates journal June 2009
Fluidity of water confined to subnanometre films journal September 2001
Composition and density of nanoscale calcium–silicate–hydrate in cement journal March 2007
Mechanisms of cement hydration journal December 2011
Combinatorial molecular optimization of cement hydrates journal September 2014
Order and disorder in calcium–silicate–hydrate journal June 2014
A realistic molecular model of cement hydrates journal September 2009
Atomistic modeling of crystal structure of Ca 1.67 SiH x journal January 2015
The importance of proper crystal-chemical and geometrical reasoning demonstrated using layered single and double hydroxides journal February 2013
Advances in understanding hydration of Portland cement journal December 2015
A dissolution-precipitation mechanism is at the origin of concrete creep in moist environments journal August 2016
Fast Parallel Algorithms for Short-Range Molecular Dynamics journal March 1995
Empirical force fields for complex hydrated calcio-silicate layered materials journal January 2011
The missing term in effective pair potentials journal November 1987
A simple thermogravimetric study of hydrated cement journal January 1985
Cement chemistry (2nd edition) book January 1997
Topology of covalent non-crystalline solids I: Short-range order in chalcogenide alloys journal October 1979
L. On the calculation of the equilibrium and stiffness of frames journal April 1864
Prediction of Glass Hardness Using Temperature-Dependent Constraint Theory journal September 2010
Topological Model for the Viscosity of Multicomponent Glass-Forming Liquids journal December 2012
Rigidity Transition in Materials: Hardness is Driven by Weak Atomic Constraints journal March 2015
Nanoscale Structure of Cement: Viewpoint of Rigidity Theory journal May 2014
Angular rigidity in tetrahedral network glasses with changing composition journal August 2011
Structure and Topology of Soda-Lime Silicate Glasses: Implications for Window Glass journal October 2014
Effect of the Ca/Si Molar Ratio on the Micro/nanomechanical Properties of Synthetic C-S-H Measured by Nanoindentation journal August 2012
Elastic properties of the main species present in Portland cement pastes journal March 2009
Coefficient of thermal expansion of cement paste and concrete: Mechanisms of moisture interaction journal July 2006
Effects of mineral admixtures on the thermal expansion properties of hardened cement paste journal September 2010
Molecular dynamics simulations of Mg-doped beta″-alumina with potential models fitted for accurate structural response to thermal vibrations journal October 2014
The thermal expansion of afwillite journal May 1953
Flexible simple point-charge water model with improved liquid-state properties journal January 2006
Comparative study of thermally conductive fillers in underfill for the electronic components journal October 2005
Anisotropic thermal expansion and hydrogen bonding behavior of portlandite: A high-temperature neutron diffraction study journal April 2007
Thermal expansion of ceramics in the MgO-CaO system journal September 1979
Die Konstitution der Mischkristalle und die Raumf�llung der Atome journal January 1921
The structure and stoichiometry of C-S-H journal September 2004
Cement and Concrete Nanoscience and Nanotechnology journal February 2010

Cited By (4)

Atomistic origin of the passivation effect in hydrated silicate glasses journal February 2019
Structure, orientation, and dynamics of water-soluble ions adsorbed to basal surfaces of calcium monosulfoaluminate hydrates journal January 2018
Realistic atomic structure of fly ash-based geopolymer gels: Insights from molecular dynamics simulations journal August 2019
Dynamics of nano-confined water in Portland cement - comparison with synthetic C-S-H gel and other silicate materials journal August 2017