| Title |
Mechanical Properties and Pore Structure of Cement Matrix at High Temperature |
| Authors |
Song Hun ; Mun Kyoung-Ju ; Soh Yang-Seob |
| Keywords |
fire ; high temperature ; mechanical properties ; porosity ; pore size |
| Abstract |
Dehydration and micro crack thermal expansion occur in cement hydrates of concrete structure heated by fire for a long time. Porosity difference due to both the dehydration of cement hydrates and pore solution causes and influences changes in the properties of materials. The characteristic of concrete exposed to high temperature can be analyzed from distribution of porosity and pore size. The aim of this study is to comprehend the characteristic of porosity of cement matrix in high temperature. ???? Based on the results of this study, the following can be summarized: 1. Compressive strength and elasticity modulus were rapidly degraded depending on a rise of ?? heating temperature. 2. Porosity showed a tendency to increase irrespective of specimen types. This is due to both the ?? outbreak of collapse of gel comprising the cement and a micro crack by heating. 3. Porosity did not affect the variety of specimen and increased with the same tendency?? ?? throughout every specimen. In addition,??the??change of properties of material resulted from ?? increase in porosity. |