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- W2247181765 abstract "Gypsum crystallization on natural building stones due to sulphatation processes is a well-known and widely described phenomenon in deterioration studies. The gaseous SO2 of the polluted environment reacts with the carbonate of the stone, resulting into gypsum (CaSO4.2H2O) crystallization on the surface and inside the porous structure of the material. In order to obtain quantitative information on porosity and open pore structure changes before and after sulphatation, the process should be monitored on the same sample. With the aid of non-destructive high-resolution X-ray computed tomography we investigated two types of limestones before and after in vitro-induced gypsum crystallization processes. A 3D image with a resolution of 2.5 μm was obtained before and after. Besides the visualization of the gypsum crystallization, also quantitative information and pore structure changes could be obtained. The focus of this study will concern the changes of the connections in the open pore structure and the closure of the apertures. In addition, some aspects of water absorption behaviour were tested. For different samples neutron images were taken which demonstrated the changes in capillary water uptake for fresh and weathered samples. The results of this research contribute to a better understanding of the evolution of pore structure changes due to deterioration." @default.
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- W2247181765 date "2011-01-01" @default.
- W2247181765 modified "2023-09-22" @default.
- W2247181765 title "Time-lapse characterization of changing open pore structures by high resolution X-ray CT" @default.
- W2247181765 hasPublicationYear "2011" @default.
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