Characterization by computed X-ray tomography of the evolution of the pore structure of a dolomite rock during freeze-thaw cyclic tests |
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| Institution: | 1. School of Mechanics & Civil Engineering, China University of Mining & Technology, Beijing 100083, China;2. State Key Laboratory of Geomechanics and Deep Underground Engineering, Beijing 100083, China;3. Institute of Foundation Engineering, China Academy of Building Research, Beijing 100013, China;4. Department of Civil, Environment and Geo-Engineering, University of Minnesota, MN 55455, USA;1. School of Architecture and Civil Engineering, Xi''an University of Science and Technology, Xi''an 710054, China;2. Key Laboratory of Safety and Durability of Concrete Structures of Shaanxi, Xijing University, Xi''an 710123, China;3. State Key Laboratory of Road Engineering Safety and Health in High-altitude Regions, CCCC First Highway Consultants Co., Ltd, Xi’an 710065, China;4. China United Northwest Institute for Engineering Design & Research Co, Ltd, Xi''an, 710077, China;5. College of Geology and Environment, Xi''an University of Science and Technology, Xi''an 710054, China;6. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | The study of the pore structure of rocks is very important for the interpretation of their behaviour when subjected to weathering. In the case of rocks used in historic buildings or in objects of art where other techniques can not be applied, the Non-Destructive Testing method (NDT) for determining porosity, such as X-ray computed tomography (X-ray CT), becomes a very interesting alternative. In this paper this technique has been used for imaging textural features and the internal pore structure of a dolomitic rock used as building material in Oviedo Cathedral, Spain. The reconstructed 3D image shows a non uniform distribution of porosity. The rock has been subjected to freeze-thaw cycles to evaluate its durability. The evolution of the void structure has also been studied by X-ray CT and the images obtained allow one to follow the progressive decay and to assess the internal depth of the damage. Because of the low resistance to weathering of the rock, damage, mainly in the form of fissures, was observed even in the initial tests (third cycle in some of the specimens). Breakdown of the rock appeared as early as cycle 12 in some specimens. |
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