Examining microstructural composition of hardened cement paste cured under high temperature and pressure using nanoindentation and 29Si MAS NMR

Jung J. Kim; Muhammad K. Rahman; Mahmoud M. Reda Taha

doi:10.1007/s13204-012-0058-z

Examining microstructural composition of hardened cement paste cured under high temperature and pressure using nanoindentation and ²⁹Si MAS NMR

Jung J. Kim
, Muhammad K. Rahman
, Mahmoud M. Reda Taha^*

^*Corresponding author for this work

Interdisciplinary Research Center for Construction and Building Materials

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

30 Scopus citations

Abstract

Microstructural composition of the hardened cement pastes are analyzed using nanoindentation and ²⁹Si MAS NMR after curing time periods of 7 and 28 days. Two curing conditions, room condition (20°C with 0.1 MPa pressure) and an elevated condition (80°C with 10 MPa pressure) are prepared to hydrate cement pastes [water to cement (w/c) ratio of 0.45]. The degree of hydration of the cement paste quantified using nanoindentation was compared with that from ²⁹Si MAS NMR. From nanoindentation of the hardened cement pastes, microstructural hydration products are characterized with respect to the corresponding modulus of elasticity. A hydration product, which has a relatively high modulus of elasticity over other known hydration products, was found in the hardened cement paste cured in elevated temperature and pressure. The effect of high pressure on the composition of the hydration product is discussed and it is hypothesized that the packing density of calcium-silicate-hydrate (C-S-H) might increase when a cement paste is hydrated under high temperature and pressure.

Original language	English
Pages (from-to)	445-456
Number of pages	12
Journal	Applied Nanoscience (Switzerland)
Volume	2
Issue number	4
DOIs	https://doi.org/10.1007/s13204-012-0058-z
State	Published - 1 Dec 2012

Bibliographical note

Publisher Copyright:
© 2012, The Author(s).

Keywords

Cement
Microstructural phases
Nanoindentation
Si MAS NMR

ASJC Scopus subject areas

Biotechnology
Atomic and Molecular Physics, and Optics
Materials Science (miscellaneous)
Physical and Theoretical Chemistry
Cell Biology
Electrical and Electronic Engineering

Access to Document

10.1007/s13204-012-0058-z

Cite this

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title = "Examining microstructural composition of hardened cement paste cured under high temperature and pressure using nanoindentation and 29Si MAS NMR",

abstract = "Microstructural composition of the hardened cement pastes are analyzed using nanoindentation and 29Si MAS NMR after curing time periods of 7 and 28 days. Two curing conditions, room condition (20°C with 0.1 MPa pressure) and an elevated condition (80°C with 10 MPa pressure) are prepared to hydrate cement pastes [water to cement (w/c) ratio of 0.45]. The degree of hydration of the cement paste quantified using nanoindentation was compared with that from 29Si MAS NMR. From nanoindentation of the hardened cement pastes, microstructural hydration products are characterized with respect to the corresponding modulus of elasticity. A hydration product, which has a relatively high modulus of elasticity over other known hydration products, was found in the hardened cement paste cured in elevated temperature and pressure. The effect of high pressure on the composition of the hydration product is discussed and it is hypothesized that the packing density of calcium-silicate-hydrate (C-S-H) might increase when a cement paste is hydrated under high temperature and pressure.",

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AU - Kim, Jung J.

AU - Rahman, Muhammad K.

AU - Reda Taha, Mahmoud M.

PY - 2012/12/1

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N2 - Microstructural composition of the hardened cement pastes are analyzed using nanoindentation and 29Si MAS NMR after curing time periods of 7 and 28 days. Two curing conditions, room condition (20°C with 0.1 MPa pressure) and an elevated condition (80°C with 10 MPa pressure) are prepared to hydrate cement pastes [water to cement (w/c) ratio of 0.45]. The degree of hydration of the cement paste quantified using nanoindentation was compared with that from 29Si MAS NMR. From nanoindentation of the hardened cement pastes, microstructural hydration products are characterized with respect to the corresponding modulus of elasticity. A hydration product, which has a relatively high modulus of elasticity over other known hydration products, was found in the hardened cement paste cured in elevated temperature and pressure. The effect of high pressure on the composition of the hydration product is discussed and it is hypothesized that the packing density of calcium-silicate-hydrate (C-S-H) might increase when a cement paste is hydrated under high temperature and pressure.

AB - Microstructural composition of the hardened cement pastes are analyzed using nanoindentation and 29Si MAS NMR after curing time periods of 7 and 28 days. Two curing conditions, room condition (20°C with 0.1 MPa pressure) and an elevated condition (80°C with 10 MPa pressure) are prepared to hydrate cement pastes [water to cement (w/c) ratio of 0.45]. The degree of hydration of the cement paste quantified using nanoindentation was compared with that from 29Si MAS NMR. From nanoindentation of the hardened cement pastes, microstructural hydration products are characterized with respect to the corresponding modulus of elasticity. A hydration product, which has a relatively high modulus of elasticity over other known hydration products, was found in the hardened cement paste cured in elevated temperature and pressure. The effect of high pressure on the composition of the hydration product is discussed and it is hypothesized that the packing density of calcium-silicate-hydrate (C-S-H) might increase when a cement paste is hydrated under high temperature and pressure.

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