Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 238, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2021.111380
Keywords
Phase-field models; Multi-physics; Fracture; Cementitious solids; Calcium leaching
Categories
Funding
- National Natural Science Foundation of China [52125801, 51878294]
- State Key Laboratory of Disaster Reduction in Civil Engineering, China [SLDRCE20-01]
- National Key Laboratory of Shockwave and Denotation Physics, China [JCKYS2020212016]
- Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology, China [2021B1212040003]
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In this study, a multi-physical phase-field model is proposed to predict the long-term behavior of calcium leached cementitious solids. By fully coupling the chemical and mechanical processes, the integrity and safety of infrastructures under aggressive aqueous environments can be accurately assessed. The results demonstrate the promising prospects of the proposed model in service-life predictions of concrete structures.
As it is extremely difficult, if not impossible, to carry out fully coupled chemo-mechanical tests lasting several hundreds of years, a reliable modeling approach is thus indispensable in assessing the integrity, durability and safety of infrastructures under aggressive aqueous environments. In this work, we propose a multi-physical phase-field model for fully coupled chemo-mechanical deterioration and fracture in calcium leached cementitious solids, aiming to predict the long-term behavior of concretes structures. The chemical sub-problem is built upon the mass conservation of calcium ions in pore solution, representing the diffusion-dissolution equilibrium of the leached system. Regarding the mechanical process, the length scale insensitive phase-field cohesive zone model is substantially extended with the calcium dissolution induced deterioration of mechanical properties properly accounted for by a porosity-dependent damage variable. Vice versa, during the leaching process both the transport diffusivity of calcium ions and the dissolution rate of the skeleton are promoted with the crack phase-field incorporated into the chemical sub-problem. The resulting inter-field fully coupled model is validated by several representative numerical examples. Both the sequentially and fully coupled chemo-mechanical problems are studied to verify the detrimental effects of simultaneous chemical attack and mechanical loading on the structural behavior. Based on the fully coupled analysis, an extra example is presented to demonstrate the promising prospects of the proposed model in service-life predictions of concrete structures under concurrent mechanical loading and aggressive environmental attacks.
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