Energy Evolution Analysis and Brittleness Evaluation of High-Strength Concrete Considering the Whole Failure Process
| Autor: | Rongbao Hong, Liangliang Zhang, Hua Cheng, Mingjing Li, Ruihe Zhou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Work (thermodynamics)
Materials science General Chemical Engineering 02 engineering and technology 01 natural sciences Inorganic Chemistry Brittleness 0103 physical sciences lcsh:QD901-999 General Materials Science Composite material 010302 applied physics brittleness evaluation index Elastic energy elastic strain energy Dissipation 021001 nanoscience & nanotechnology Condensed Matter Physics Overburden pressure high-strength concrete Dissipative system energy evolution lcsh:Crystallography 0210 nano-technology Energy (signal processing) Ductility (Earth science) |
| Zdroj: | Crystals Volume 10 Issue 12 Crystals, Vol 10, Iss 1099, p 1099 (2020) |
| ISSN: | 2073-4352 |
| DOI: | 10.3390/cryst10121099 |
| Popis: | In this work, we aimed to solve the problems that exist in the brittleness evaluation method of high-strength concrete through a triaxial compression test of C60 and C70 high-strength concrete. Then, the relationship between the energy evolution of its elastic energy, dissipative energy, pre-peak total energy and additional energy and its axial strain, confining pressure, and concrete strength grade was analyzed. Taking the accumulation rate of pre-peak elastic strain energy and the dissipation rate of dissipative energy, and the release rate of post-peak elastic energy, as the evaluation indicators to characterize the brittleness of high-strength concrete. A brittleness evaluation method that reflects the whole failure process of high-strength concrete is proposed and verified by experiments. The results show that with the increase of the confining pressure, the proportion of elastic energy in the whole process of high-strength concrete failure gradually decreases. The storage rate of pre-peak elastic energy and the release rate of post-peak elastic energy are gradually reducing, the brittleness index gradually decreases, and the confining pressure inhibits the brittleness of high-strength concrete. Under the same confining pressure, the brittleness index of C70 concrete is greater than that of C60 concrete, which indicates that, with the increase of the strength grade, the brittleness level of concrete gradually increases and the ductility decreases. These findings have a certain theoretical significance for the scientific design of high-strength concrete structures and the improvement of their safety in the future. |
| Databáze: | OpenAIRE |
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