Zhang, M; He, Y; Ye, G; Lange, D; van Breugel, K; (2011) Evaluation of microstructure and transport properties of hydrating cement paste using micro-CT image. In: Palomo, Angel, (ed.) Proceedings of the XIII International Congress on Cement Chemistry (ICCC). Instituto de Ciencias de la Construccion: Madrid, Spain.

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Abstract

X-ray computed microtomography (micro-CT) was utilized to obtain three- dimensional (3D) images of the hydrating of cement paste with water-to-cement (w/c) ratio at different ages, i.e., 1, 3, 7 and 28 days. On the basis of the gray level histogram of microtomography images, the phase threshold values for each specimen were determined. The component phases of the cement paste such as pores, hydration products and unhydrated cement particles were identified from each other. The volume fraction of pore and degree of hydration of the specimens at different curing ages were estimated from the image analysis and compared with the experimental data measured by mercury intrusion porosimetry (MIP) tests and loss-on-ignition (LOI) tests respectively. Furthermore, the degree of pore connectivity was analyzed based on cluster-labelling technique. Finally, transport properties, e.g. diffusivity of tritiated water of each specimen was estimated and compared with the experimental results obtained from the literature. The results derived from image analysis show a reasonably agreement with the measured results, which indicates that micro-CT is a reliable and suitable technique to characterize the microstructure evolution of hydrating cement paste. The obtained microstructure can be used to estimate the transport properties of cement-based materials.

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