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Microstructural characteristics of HPC under different thermo-mechanical and thermo-hydraulic conditions
The microstructural characteristics of high performance concrete (HPC) samples were analysed using scanning electronic microscopy (SEM) and X-ray diffraction (XRD) following thermo-hydraulic and thermo-mechanical testing. The relationship between engineering behaviour (transport and mechanical properties) and microstructure for HPC was then analysed. The failure mechanism of HPC under thermo-mechanical conditions was also discussed. Lower porosity, a higher content of calcium silicate hydrate (C−S−H) and a lower content of the crystalline-phase calcium hydroxide (CH) in both the cement paste and transition zone all exerted a positive influence on the transport and mechanical properties of HPC. By increasing temperature to 200°C, the evaporation of water led to an increase in capillary porosity as well as to a reduction in the cohesive forces between C−S−H layers, which cause degradation of the concrete’s transport and mechanical properties. Microcracking under thermo-mechanical conditions proved to be the main failure mechanism of HPC.
Microstructural characteristics of HPC under different thermo-mechanical and thermo-hydraulic conditions
The microstructural characteristics of high performance concrete (HPC) samples were analysed using scanning electronic microscopy (SEM) and X-ray diffraction (XRD) following thermo-hydraulic and thermo-mechanical testing. The relationship between engineering behaviour (transport and mechanical properties) and microstructure for HPC was then analysed. The failure mechanism of HPC under thermo-mechanical conditions was also discussed. Lower porosity, a higher content of calcium silicate hydrate (C−S−H) and a lower content of the crystalline-phase calcium hydroxide (CH) in both the cement paste and transition zone all exerted a positive influence on the transport and mechanical properties of HPC. By increasing temperature to 200°C, the evaporation of water led to an increase in capillary porosity as well as to a reduction in the cohesive forces between C−S−H layers, which cause degradation of the concrete’s transport and mechanical properties. Microcracking under thermo-mechanical conditions proved to be the main failure mechanism of HPC.
Microstructural characteristics of HPC under different thermo-mechanical and thermo-hydraulic conditions
Mater Struct
Li, X. J. (author) / Li, Z. J. (author) / Onofrei, M. (author) / Ballivy, G. (author) / Khayat, K. H. (author)
Materials and Structures ; 32 ; 727-733
1999-12-01
7 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 1999
Thermo-mechanical behavior of energy pile under different climatic conditions
| Springer Verlag | 2018