论文信息 - Mechanical characteristics of self-compacting concretes with different filler materials, exposed to elevated temperatures

Mechanical characteristics of self-compacting concretes with different filler materials, exposed to elevated temperatures

In this paper, the studies concern the influence that different fillers have on the properties of SCC of different strength classes when exposed to high temperatures. A total of six different SCC and two conventional concrete mixtures were produced. The specimens produced are placed at the age of 180 days in an electrical furnace which is capable of reaching 300°C at half an hour and 600°C at 70 min. The maximum temperature is maintained for an hour. Then the specimens are let to cool down in the furnace. The hardened properties measured after fire exposures are the compressive strength, splitting tensile strength, water capillary absorption and the ultrasonic pulse velocity. Explosive spalling occurred in most cases when specimens of higher strength class are exposed to high temperatures. The spalling tendency is increased for specimens of higher strength class C30/37 irrespective of the mixture type (SCC or NC) and the type of filler used.

[1] Wei-Ming Lin,et al. Microstructures of Fire-Damaged Concrete , 1996 .

[2] Microstructure and Properties of Interfacial Transition Zone in SCC , 2005 .

[3] K. Sideris,et al. Influence of elevated temperatures on the mechanical properties of blended cement concretes prepared with limestone and siliceous aggregates , 2005 .

[4] Daniel Quenard,et al. Spalling and pore pressure in HPC at high temperatures , 2000 .

[5] Y. N. Chan,et al. Residual strength and pore structure of high-strength concrete and normal strength concrete after exposure to high temperatures , 1999 .

[6] J. Piasta,et al. Heat deformations of cement paste phases and the microstructure of cement paste , 1984 .

[7] Kosmas K. Sideris,et al. Mechanical Characteristics of Self-Consolidating Concretes Exposed to Elevated Temperatures , 2007 .

[8] J. Trägardh,et al. Microstructural features and related properties of self-compacting concrete , 1999 .

[9] S. Yi,et al. Effect of strength and age on the stress–strain curves of concrete specimens , 2003 .

[10] Bertil R. R. Persson,et al. Fire resistance of self-compacting concrete, SCC , 2004 .

[11] Y. Chen,et al. Residual stress–strain relationship for concrete after exposure to high temperatures , 2006 .

[12] Luc Taerwe,et al. Phase distribution and microstructural changes of self-compacting cement paste at elevated temperature , 2007 .