Damage Depth Evaluation of Concrete Exposed to High Temperatures

• Main Authors: Dao-Jie Chen, 陳道杰
• Other Authors: 林宜清
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/86648170879866308755

碩士 === 國立中興大學 === 土木工程學系所 === 94 === Concrete structures have long been regarded as fire-resistant structures. However, under the extreme heat of a fire, the effect of thermo-conductivity of concrete makes the different damage (such as the appearance of cracks and flaws) into the entrails or on the surface of concrete. For a fire-damaged concrete construction, nondestructive test results show that there is a significant difference in the impact-echo responses between the damaged and non-damaged concrete. The time-of-flight refraction technique can be used to obtain information about the damaged depth of concrete. For concrete specimens exposed to a high temperature of 600 and 800 ℃, the results obtained from the impact-echo tests show that the damage depth is in the range between 4.7 to 6.4 cm and 8.4 to 9.8 cm, respectively.