Experimental insight into spalling behavior of concrete tunnel linings under fire loading

• DOI: 10.1007/s11440-008-0069-9
• Publication Date: 2008-10-21T16:57:59Z
• Authors: Matthias Zeiml; Roman Lackner; Herbert A. Mang
• Keywords: 0211 other engineering and technologies; 02 engineering and technology; 0201 civil engineering

New experimental insight into the spalling behavior of concrete in fire conditions is presented in this paper. Spalling was recorded by a high-speed camera. The slow-motion sequences allow us to determine the size, shape, and velocity of the spalled-off pieces. With this information at hand, the released energy associated with every spalling event is computed and compared to the energies associated with pore-pressure and thermal-stress spalling. This comparison provides new insight into the impact of the various thermal, mechanical, and hydral processes controlling concrete spalling.