科研之友
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摘要
From the thermodynamic considerations and from a virtual microstructure of cement paste, a quantitative assessment of the internal damage of cement paste due to hydraulic pressure is investigated by 3D lattice fracture model. Two issues are solved in this study: (1) the capillary pores related to the penetration of ice crystals are characterized by a multi-step digitalization algorithm. (2) The hydraulic pressure P-L is achieved through an iterative fracture process simulation where the creation of micro-cracks is taken into account. The iterative fracture process simulation then is verified by a benchmark test. Simulations indicate that randomly distributed micro-cracks are formed at a low ice crystal saturation degree S-C (defined as the molar percentage of water transformed into ice crystals), while local propagation of micro-cracks occurs and transverse cracks can be formed at high S-C. Comparison of S-C and cracks pattern by simulation and by experiments are finally discussed.
