Air void morphology in fresh cement pastes

D. J. Corr; J. Lebourgeois; P. J M Monteiro; S. J. Bastacky; E. M. Gartner

doi:10.1016/S0008-8846(01)00751-7

Air void morphology in fresh cement pastes

D. J. Corr, J. Lebourgeois, P. J M Monteiro^*, S. J. Bastacky, E. M. Gartner

^*Corresponding author for this work

Civil and Environmental Engineering

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

50 Scopus citations

Abstract

Two different procedures are used in conjunction with low-temperature scanning electron microscopy to image the air voids in cement pastes at very early ages. The first procedure isolates the air voids from cement paste after less than 30 min of hydration, and allows them to be imaged apart from the paste. The second procedure involves quenching the fresh cement paste specimens in liquid nitrogen after 5 min of hydration. In both cases, a distinct air void shell is apparent even at these short hydration times. The shell appears to be made up of small (1-5 μm) mineral particles. The second method confirms the presence of a water-rich transition zone around the air voids in the quenched pastes, consistent with earlier studies. Foam stability studies show that sodium oleate gives more stable foams than sodium dodecyl benzene sulfonate, but is more sensitive to the presence of calcium ions.

Original language	English (US)
Pages (from-to)	1025-1031
Number of pages	7
Journal	Cement and Concrete Research
Volume	32
Issue number	7
DOIs	https://doi.org/10.1016/S0008-8846(01)00751-7
State	Published - Jul 2002

Keywords

Admixture
Cement paste
Freeze and thawing
Microstructure
SEM

ASJC Scopus subject areas

Building and Construction
General Materials Science

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10.1016/S0008-8846(01)00751-7

Cite this

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title = "Air void morphology in fresh cement pastes",

abstract = "Two different procedures are used in conjunction with low-temperature scanning electron microscopy to image the air voids in cement pastes at very early ages. The first procedure isolates the air voids from cement paste after less than 30 min of hydration, and allows them to be imaged apart from the paste. The second procedure involves quenching the fresh cement paste specimens in liquid nitrogen after 5 min of hydration. In both cases, a distinct air void shell is apparent even at these short hydration times. The shell appears to be made up of small (1-5 μm) mineral particles. The second method confirms the presence of a water-rich transition zone around the air voids in the quenched pastes, consistent with earlier studies. Foam stability studies show that sodium oleate gives more stable foams than sodium dodecyl benzene sulfonate, but is more sensitive to the presence of calcium ions.",

keywords = "Admixture, Cement paste, Freeze and thawing, Microstructure, SEM",

author = "Corr, {D. J.} and J. Lebourgeois and Monteiro, {P. J M} and Bastacky, {S. J.} and Gartner, {E. M.}",

note = "Funding Information: The authors would like to thank Ms. Evelyn Clausnitzer of the Children's Hospital Oakland Research Institute for her assistance with the LTSEM analysis presented herein. We would also like to recognize the National Science Foundation (NSF grant 442408-21202) and the California Tobacco-Related Disease Research Program (grant 4RT-0832) for their continued support of this research.",

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doi = "10.1016/S0008-8846(01)00751-7",

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AU - Lebourgeois, J.

AU - Monteiro, P. J M

AU - Bastacky, S. J.

AU - Gartner, E. M.

N1 - Funding Information: The authors would like to thank Ms. Evelyn Clausnitzer of the Children's Hospital Oakland Research Institute for her assistance with the LTSEM analysis presented herein. We would also like to recognize the National Science Foundation (NSF grant 442408-21202) and the California Tobacco-Related Disease Research Program (grant 4RT-0832) for their continued support of this research.

PY - 2002/7

Y1 - 2002/7

N2 - Two different procedures are used in conjunction with low-temperature scanning electron microscopy to image the air voids in cement pastes at very early ages. The first procedure isolates the air voids from cement paste after less than 30 min of hydration, and allows them to be imaged apart from the paste. The second procedure involves quenching the fresh cement paste specimens in liquid nitrogen after 5 min of hydration. In both cases, a distinct air void shell is apparent even at these short hydration times. The shell appears to be made up of small (1-5 μm) mineral particles. The second method confirms the presence of a water-rich transition zone around the air voids in the quenched pastes, consistent with earlier studies. Foam stability studies show that sodium oleate gives more stable foams than sodium dodecyl benzene sulfonate, but is more sensitive to the presence of calcium ions.

AB - Two different procedures are used in conjunction with low-temperature scanning electron microscopy to image the air voids in cement pastes at very early ages. The first procedure isolates the air voids from cement paste after less than 30 min of hydration, and allows them to be imaged apart from the paste. The second procedure involves quenching the fresh cement paste specimens in liquid nitrogen after 5 min of hydration. In both cases, a distinct air void shell is apparent even at these short hydration times. The shell appears to be made up of small (1-5 μm) mineral particles. The second method confirms the presence of a water-rich transition zone around the air voids in the quenched pastes, consistent with earlier studies. Foam stability studies show that sodium oleate gives more stable foams than sodium dodecyl benzene sulfonate, but is more sensitive to the presence of calcium ions.

KW - Admixture

KW - Cement paste

KW - Freeze and thawing

KW - Microstructure

KW - SEM

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Air void morphology in fresh cement pastes

Abstract

Keywords

ASJC Scopus subject areas

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