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Synchrotron-radiation X-ray tomography: A method for the 3D verification of cement microstructure and its evolution during hydration

: Helfen, L.; Dehn, F.; Mikulik, P.; Baumbach, T.

Bartos, P.J.M.:
Nanotechnology in construction. 1st International Symposium on Nanotechnology in Construction 2003. Proceedings : Held on 23 - 25 June 2003, at the University of Paisley, Paisley, Scotland
Cambridge: RSC, 2004 (Royal Society of Chemistry. Special publication 292)
ISBN: 0-85404-623-2
International Symposium on Nanotechnology in Construction <1, 2003, Paisley>
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

New possibilities opened up by synchrotron radiation could present x-ray tomog. as an exptl. imaging method to study the microstructural evolution during cement hydration. The present work demonstrates the potential of the method for the investigation of cement structure after solidification. Quant. detn. of the spatial absorption coeff. distribution due to the use of monochromatic radiation and the achieved high spatial resoln. allows us to characterize the hydration process of cement vol. on a micrometer scale in three dimensions. In particular, effects as the formation of microcracks and pores related to autogeneous shrinkage involved with the hydration process could be obsd. for the first time with down to one micrometer resoln. By image anal. of the acquired three-dimensional data sets the temporal evolution of microporosity for different water-cement ratios of the initial cement paste could be detd.