| Title |
Correlation Between Variation of Pore Structure and Heating Temperatures of High Strength Concrete |
| Authors |
Song Hun ; Lee Jong-Chan ; Lee Sea-Hyun |
| Keywords |
High Strength Concrete ; Silica Fume ; High Temperature ; Pore Structure ; Porosity |
| Abstract |
This work involves investigating the correlation between variation of pore structure and heating temperature of high strength concrete using silica fume. Dehydration and micro crack thermal expansion occur in cement hydrates of concrete structure heated by fire. Porosity difference due to both the dehydration of cement hydrates and pore solution causes and influences changes in the properties of materials.
Based on the results of this study, the following can be summarized:
1. Compressive strength, elasticity modulus and poisson's ratio were degraded depending on a rise of heating temperature.
2. Porosity and distribution of pore radius were remarkedly affected by micro filling effect of silica fume and different water-binder ratios.
3. High temperature caused the increase of porosity, which resulted from the reason that evaporable water in gel or capillary pores as well as chemical bound water was eliminated from hardened cement paste due to the dehydration of C-S-H and Ca(OH)2. |