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Pore structure and permeability of hardened calcium aluminate cement pastes of low w/c ratio

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Abstract

The conversion of hydrated calcium aluminate cement (CAC) leads to an increase of its porosity which results in lower strength and higher permeability. Due to particular failures in the past, caused by conversion of CAC concretes, their use is sometimes considered to be not reliable. To evaluate the durability of converted CAC, pastes of two CACs were prepared at low w/c ratios (0.25 and 0.35), heated to 105 °C for 15 days and investigated by means of helium pycnometry, mercury porosimetry and nitrogen adsorption as well as by air permeability measurements. The results were compared to the pore structure properties and permeabilities of hardened Portland cement (OPC) pastes. At identical w/c, CAC pastes and OPC pastes exhibited similar open and total porosities. The threshold radii of the CAC pastes were about one order of magnitude greater while the hydraulic radii of their open pore system were smaller. The CAC pastes possessed somewhat smaller permeabilities than the OPC pastes and can thus be regarded as being as durable as the latter in this respect. From comparison of pore structure parameters and permeabilities it was furthermore concluded that significant pore structure damage occurs in the CAC pastes during mercury porosimetry measurements and therefore the measured threshold radii have to be considered as unreliable.

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Acknowledgments

Part of the present work was funded by the FNR Agency for Renewable Resources under grant No. 22010502, which is gratefully acknowledged. The authors would also like to thank Drs Monika Höpcke and Ralf Röben (MBF Institut, Berlin) for providing the permeability measurement set-up.

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  1. G. J. G. Gluth

    Present address: BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205, Berlin, Germany

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  1. Institute for Civil Engineering, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355, Berlin, Germany

    G. J. G. Gluth & B. Hillemeier

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  1. G. J. G. Gluth
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  2. B. Hillemeier
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Correspondence to G. J. G. Gluth.

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Gluth, G.J.G., Hillemeier, B. Pore structure and permeability of hardened calcium aluminate cement pastes of low w/c ratio. Mater Struct 46, 1497–1506 (2013). https://doi.org/10.1617/s11527-012-9991-2

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