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Ettringite formation in compressed expansive cement pastes

Mikhail, R.Sh. / Abo-El-Enein, S.A. / Hanafi, S. / Good, R.J.

AbstractType I expansive clinker pastes of w/c=0.25 were compressed at pressures of 50, 200 and 500 Kg/cm². Several parameters of the hardened pastes, measured at various curing ages, were compared with those of the non-compressed (control) pastes. Relative values (α values) were developed to express the changes due to compression in total porosity, non-evaporable water, compressive strength, as well as in specific surface area. Surface area changes are due to changes in the size and subsequent growth of the ettringite crystallites. This work is affected by the available pore space. SEM gave direct evidence in favour of a through-solution mechanism at least beyond one day of hydration.

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Ettringite formation in compressed expansive cement pastes

Mikhail, R.Sh. / Abo-El-Enein, S.A. / Hanafi, S. / Good, R.J.

AbstractType I expansive clinker pastes of w/c=0.25 were compressed at pressures of 50, 200 and 500 Kg/cm². Several parameters of the hardened pastes, measured at various curing ages, were compared with those of the non-compressed (control) pastes. Relative values (α values) were developed to express the changes due to compression in total porosity, non-evaporable water, compressive strength, as well as in specific surface area. Surface area changes are due to changes in the size and subsequent growth of the ettringite crystallites. This work is affected by the available pore space. SEM gave direct evidence in favour of a through-solution mechanism at least beyond one day of hydration.

Ettringite formation in compressed expansive cement pastes

Mikhail, R.Sh. / Abo-El-Enein, S.A. / Hanafi, S. / Good, R.J.

AbstractType I expansive clinker pastes of w/c=0.25 were compressed at pressures of 50, 200 and 500 Kg/cm². Several parameters of the hardened pastes, measured at various curing ages, were compared with those of the non-compressed (control) pastes. Relative values (α values) were developed to express the changes due to compression in total porosity, non-evaporable water, compressive strength, as well as in specific surface area. Surface area changes are due to changes in the size and subsequent growth of the ettringite crystallites. This work is affected by the available pore space. SEM gave direct evidence in favour of a through-solution mechanism at least beyond one day of hydration.

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Title:

Ettringite formation in compressed expansive cement pastes

Contributors:

Mikhail, R.Sh. (author) / Abo-El-Enein, S.A. (author) / Hanafi, S. (author) / Good, R.J. (author)

Published in:

Cement and Concrete Research ; 11 ; 665-673

Publication date:

1981-05-19

Size:

9 pages

ISSN:

DOI:

https://doi.org/10.1016/0008-8846(81)90025-9

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

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