On the thermal spalling mechanism of reactive powder concrete exposed to high temperature: Numerical and experimental studies
| Autor: | Jinhui Liu, Liu Hongbin, Yang Ju, Ge Zhishun, Kaipei Tian |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Computer simulation Mechanical Engineering Multiphysics 0211 other engineering and technologies 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Spall Finite element method Stress (mechanics) Stress field Distortion 021105 building & construction Thermal 0210 nano-technology |
| Zdroj: | International Journal of Heat and Mass Transfer. 98:493-507 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2016.03.033 |
| Popis: | Concrete spalling at high temperature seriously jeopardizes the integrity of the entire structure. Many explanations for the spalling risk exist, but few models can accurately predict it. A numerical approach to quantitatively characterizing the intrinsic mechanism that governs the devastating spalling of RPC at high temperature is presented. The proposed model is implemented in COMSOL MULTIPHYSICS, and the finite element method is employed as the basic stress analysis tool. The maximum tensile stress criterion and the distortion energy density theory are utilized as the spalling failure thresholds. The interior temperature field, stress field, spalling distribution and evolution of RPC are analyzed accordingly. It is shown that the numerical simulation results are in good agreement with the experimental observations of RPC’s spalling. A conceptual model is proposed to elucidate the mechanism that induces the progressive spalling failure of RPC based on the numerical and experimental results. |
| Databáze: | OpenAIRE |
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