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Multiscale structure of calcium- and magnesium-silicate-hydrate gels

Chiang, W.S. / Ferraro, G. / Fratini, E. / Ridi, F. / Yeh, Y.Q. / Jeng, U.S. / Chen, S.H. / Baglioni, P.

Concrete is the world's most widely used building material. However, the production of CaO-based cements generates large amounts of anthropogenic emissions of CO₂. Among different strategies to reduce CO₂ emissions, newly developed MgO-based cements, though currently suffering from inferior mechanical properties, are some of the most promising and attractive options. By combining wide- and small-angle X-ray scattering and electron microscopy, we identified differences in the multiscale structure of the two main binding phases: the calcium-silicate-hydrate (C-S-H) gel for CaO-based cements and the magnesium-silicate-hydrate (M-S-H) gel for MgO-based cements. We found the primary unit at the nanoscale level of C-S-H to be a multilayer disk-like globule, whereas for M-S-H it is a spherical globule. These prominent differences result in diverse microstructures, leading to disparities in mechanical properties and durability for the associated cements. Modulating the M-S-H structure and enhancing the compatibility between C-S-H and M-S-H will be the key to improve the robustness of eco-friendly MgO-based binders.

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Multiscale structure of calcium- and magnesium-silicate-hydrate gels

Chiang, W.S. / Ferraro, G. / Fratini, E. / Ridi, F. / Yeh, Y.Q. / Jeng, U.S. / Chen, S.H. / Baglioni, P.

Concrete is the world's most widely used building material. However, the production of CaO-based cements generates large amounts of anthropogenic emissions of CO₂. Among different strategies to reduce CO₂ emissions, newly developed MgO-based cements, though currently suffering from inferior mechanical properties, are some of the most promising and attractive options. By combining wide- and small-angle X-ray scattering and electron microscopy, we identified differences in the multiscale structure of the two main binding phases: the calcium-silicate-hydrate (C-S-H) gel for CaO-based cements and the magnesium-silicate-hydrate (M-S-H) gel for MgO-based cements. We found the primary unit at the nanoscale level of C-S-H to be a multilayer disk-like globule, whereas for M-S-H it is a spherical globule. These prominent differences result in diverse microstructures, leading to disparities in mechanical properties and durability for the associated cements. Modulating the M-S-H structure and enhancing the compatibility between C-S-H and M-S-H will be the key to improve the robustness of eco-friendly MgO-based binders.

Multiscale structure of calcium- and magnesium-silicate-hydrate gels

Chiang, W.S. / Ferraro, G. / Fratini, E. / Ridi, F. / Yeh, Y.Q. / Jeng, U.S. / Chen, S.H. / Baglioni, P.

Concrete is the world's most widely used building material. However, the production of CaO-based cements generates large amounts of anthropogenic emissions of CO₂. Among different strategies to reduce CO₂ emissions, newly developed MgO-based cements, though currently suffering from inferior mechanical properties, are some of the most promising and attractive options. By combining wide- and small-angle X-ray scattering and electron microscopy, we identified differences in the multiscale structure of the two main binding phases: the calcium-silicate-hydrate (C-S-H) gel for CaO-based cements and the magnesium-silicate-hydrate (M-S-H) gel for MgO-based cements. We found the primary unit at the nanoscale level of C-S-H to be a multilayer disk-like globule, whereas for M-S-H it is a spherical globule. These prominent differences result in diverse microstructures, leading to disparities in mechanical properties and durability for the associated cements. Modulating the M-S-H structure and enhancing the compatibility between C-S-H and M-S-H will be the key to improve the robustness of eco-friendly MgO-based binders.

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Title:

Multiscale structure of calcium- and magnesium-silicate-hydrate gels

Contributors:

Chiang, W.S. (author) / Ferraro, G. (author) / Fratini, E. (author) / Ridi, F. (author) / Yeh, Y.Q. (author) / Jeng, U.S. (author) / Chen, S.H. (author) / Baglioni, P. (author)

Published in:

Journal of Materials Chemistry A ; 2 ; 12991-12998

Publication date:

2014

Size:

8 Seiten, 43 Quellen

ISSN:

DOI:

https://doi.org/10.1039/c4ta02479f

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Gel , Magnesiumsilicathydrat , Calcium , Baumaterial , Calciumsilicathydrat , Röntgenstrahl , Elektronenmikroskopie , Mikrostruktur , Mehrfachschicht

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