Dynamical behaviors of structural, constrained and free water in calcium- and magnesium-silicate-hydrate gels

Peisi Le; Emiliano Fratini; Kanae Ito; Zhe Wang; Eugene Mamontov; Piero Baglioni; Sow Hsin Chen

doi:10.1016/j.jcis.2016.01.071

Dynamical behaviors of structural, constrained and free water in calcium- and magnesium-silicate-hydrate gels

Peisi Le, Emiliano Fratini, Kanae Ito, Zhe Wang, Eugene Mamontov, Piero Baglioni, Sow Hsin Chen

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Hypothesis: The mechanical properties of cement pastes depend strongly on their porosities. In a saturated paste, the porosity links to the free water volume after hydration. Structural water, constrained water, and free water have different dynamical behavior. Hence, it should be possible to extract information on pore system by exploiting the water dynamics. Experiments: We investigated the slow dynamics of hydration water confined in calcium- and magnesium-silicate-hydrate (C-S-H and M-S-H) gels using high-resolution quasi-elastic neutron scattering (QENS) technique. C-S-H and M-S-H are the chemical binders present in calcium rich and magnesium rich cements. We measured three M-S-H samples: pure M-S-H, M-S-H with aluminum-silicate nanotubes (ASN), and M-S-H with carboxyl group functionalized ASN (ASN-COOH). A C-S-H sample with the same water content (i.e. 0.3) is also studied for comparison. Findings: Structural water in the gels contributes to the elastic component of the QENS spectrum, while constrained water and free water contribute the quasi-elastic component. The quantitative analysis suggests that the three components vary for different samples and indicate the variance in the system porosity, which controls the mechanical properties of cement pastes.

Original language	English
Pages (from-to)	157-163
Number of pages	7
Journal	Journal of Colloid and Interface Science
Volume	469
DOIs	https://doi.org/10.1016/j.jcis.2016.01.071
State	Published - May 1 2016
Externally published	Yes

Funding

The research at MIT was supported by U.S. DOE grant DE-FG02-90ER45429 . The neutron scattering experiments at SNS, ORNL were supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE . E.F. and P.B. acknowledge financial support from Consorzio per lo Sviluppo dei Sistemi a Grande Interfase (CSGI) and MIUR. P. L. thanks Prof. H. Li for providing the C-S-H QENS data and Dr. W.-S. Chiang for her insight on cement structures.

Funders	Funder number
CSGI
Consorzio per lo Sviluppo dei Sistemi a Grande Interfase
Scientific User Facilities Division
U.S. Department of Energy	DE-FG02-90ER45429
Basic Energy Sciences
Ministero dell’Istruzione, dell’Università e della Ricerca

Keywords

Calcium-silicate-hydrate
Magnesium-silicate-hydrate
Porous material
Quasi-elastic neutron scattering
Water dynamics

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10.1016/j.jcis.2016.01.071

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title = "Dynamical behaviors of structural, constrained and free water in calcium- and magnesium-silicate-hydrate gels",

abstract = "Hypothesis: The mechanical properties of cement pastes depend strongly on their porosities. In a saturated paste, the porosity links to the free water volume after hydration. Structural water, constrained water, and free water have different dynamical behavior. Hence, it should be possible to extract information on pore system by exploiting the water dynamics. Experiments: We investigated the slow dynamics of hydration water confined in calcium- and magnesium-silicate-hydrate (C-S-H and M-S-H) gels using high-resolution quasi-elastic neutron scattering (QENS) technique. C-S-H and M-S-H are the chemical binders present in calcium rich and magnesium rich cements. We measured three M-S-H samples: pure M-S-H, M-S-H with aluminum-silicate nanotubes (ASN), and M-S-H with carboxyl group functionalized ASN (ASN-COOH). A C-S-H sample with the same water content (i.e. 0.3) is also studied for comparison. Findings: Structural water in the gels contributes to the elastic component of the QENS spectrum, while constrained water and free water contribute the quasi-elastic component. The quantitative analysis suggests that the three components vary for different samples and indicate the variance in the system porosity, which controls the mechanical properties of cement pastes.",

keywords = "Calcium-silicate-hydrate, Magnesium-silicate-hydrate, Porous material, Quasi-elastic neutron scattering, Water dynamics",

author = "Peisi Le and Emiliano Fratini and Kanae Ito and Zhe Wang and Eugene Mamontov and Piero Baglioni and Chen, {Sow Hsin}",

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AU - Le, Peisi

AU - Fratini, Emiliano

AU - Ito, Kanae

AU - Wang, Zhe

AU - Mamontov, Eugene

AU - Baglioni, Piero

AU - Chen, Sow Hsin

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N2 - Hypothesis: The mechanical properties of cement pastes depend strongly on their porosities. In a saturated paste, the porosity links to the free water volume after hydration. Structural water, constrained water, and free water have different dynamical behavior. Hence, it should be possible to extract information on pore system by exploiting the water dynamics. Experiments: We investigated the slow dynamics of hydration water confined in calcium- and magnesium-silicate-hydrate (C-S-H and M-S-H) gels using high-resolution quasi-elastic neutron scattering (QENS) technique. C-S-H and M-S-H are the chemical binders present in calcium rich and magnesium rich cements. We measured three M-S-H samples: pure M-S-H, M-S-H with aluminum-silicate nanotubes (ASN), and M-S-H with carboxyl group functionalized ASN (ASN-COOH). A C-S-H sample with the same water content (i.e. 0.3) is also studied for comparison. Findings: Structural water in the gels contributes to the elastic component of the QENS spectrum, while constrained water and free water contribute the quasi-elastic component. The quantitative analysis suggests that the three components vary for different samples and indicate the variance in the system porosity, which controls the mechanical properties of cement pastes.

AB - Hypothesis: The mechanical properties of cement pastes depend strongly on their porosities. In a saturated paste, the porosity links to the free water volume after hydration. Structural water, constrained water, and free water have different dynamical behavior. Hence, it should be possible to extract information on pore system by exploiting the water dynamics. Experiments: We investigated the slow dynamics of hydration water confined in calcium- and magnesium-silicate-hydrate (C-S-H and M-S-H) gels using high-resolution quasi-elastic neutron scattering (QENS) technique. C-S-H and M-S-H are the chemical binders present in calcium rich and magnesium rich cements. We measured three M-S-H samples: pure M-S-H, M-S-H with aluminum-silicate nanotubes (ASN), and M-S-H with carboxyl group functionalized ASN (ASN-COOH). A C-S-H sample with the same water content (i.e. 0.3) is also studied for comparison. Findings: Structural water in the gels contributes to the elastic component of the QENS spectrum, while constrained water and free water contribute the quasi-elastic component. The quantitative analysis suggests that the three components vary for different samples and indicate the variance in the system porosity, which controls the mechanical properties of cement pastes.

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Dynamical behaviors of structural, constrained and free water in calcium- and magnesium-silicate-hydrate gels

Abstract

Funding

Keywords

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