Behaviour of granites and limestones subjected to slow and homogeneous temperature changes |
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Authors: | Françoise Homand-Etienne Jean-Pierre Troalen |
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Institution: | Ecole Nationale Supérieure de Géologie Appliquée et de Prospection Minière, Rue du Doyen Marcel Roubault, B.P. n° 40, 54501 Vandoeuure-Les-Nancy France |
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Abstract: | We have studied the evolution of the texture in two granites and two limestones subjected to slow and uniform temperature change. Each granite has a different grain size and each limestone a different texture: Carrare crystalline limestone and Crepey oolitic limestone. Temperature was varied from 200°C to 700°C. Scanning Electron Microscope observations of different rock samples show that during thermal cycling intercrystalline boundaries in granites widen out progressively and porosity increases. New microcracks appear in crystals between 500°C and 600°C. In Carrare crystalline limestone, intercrystalline cracks appear at temperatures as low as 200°C. Due to its heterogeneous cracks appear at temperatures as low as 200°C. Due to its heterogeneous increasing temperature. Longitudinal wave velocity and intrinsic permeability show good correlation with the Scanning Electron Microscope observations. |
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