Compressive behaviour of hybrid fiber-reinforced reactive powder concrete after high temperature

Abstract This study focuses on the compressive properties and microstructures of reactive powder concrete (RPC) mixed with steel fiber and polypropylene fiber after exposure to 20–900 °C. The volume dosage of steel fiber and polypropylene fiber is (2%, 0.1%), (2%, 0.2%) and (1%, 0.2%). The effects of heating temperature, fiber content and specimen size on the compressive properties are analyzed. The microstructures of RPC exposed to different high temperatures are studied by scanning electron microscope (SEM). The results indicate that the compressive strength of hybrid fiber-reinforced RPC increases at first, then decreases with the increasing temperature, and the basic reason for the degradation of macro-mechanical properties is the deterioration of RPC microstructure. Based on the experimental results, equations to express the relationships of the compressive strength with the heating temperatures are established. Compared with normal-strength and high-strength concrete, the hybrid fiber-reinforced RPC has excellent capacity in resistance to high temperature.

[1]  Y. Tai,et al.  Mechanical properties of steel fiber reinforced reactive powder concrete following exposure to high temperature reaching 800 ◦ C , 2011 .

[2]  Laurent Frouin,et al.  Microstructural analysis of RPC (Reactive Powder Concrete) , 1995 .

[3]  O. Bonneau,et al.  REACTIVE POWDER CONCRETES: FROM THEORY TO PRACTICE , 1996 .

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

[5]  Chi Sun Poon,et al.  COMPRESSIVE BEHAVIOR OF FIBER REINFORCED HIGH-PERFORMANCE CONCRETE SUBJECTED TO ELEVATED TEMPERATURES , 2004 .

[6]  Metin Hüsem,et al.  The effects of high temperature on compressive and flexural strengths of ordinary and high-performance concrete , 2006 .

[7]  P. Richard,et al.  Composition of reactive powder concretes , 1995 .

[8]  Zheng,et al.  Experimental study on mechanical properties of reactive powder concrete , 2010 .

[9]  M. An,et al.  Size effect on compressive strength of reactive powder concrete , 2008 .

[10]  Wen-Wu Yang,et al.  Explosive spalling and residual mechanical properties of fiber-toughened high-performance concrete subjected to high temperatures , 2006 .

[11]  M. Anson,et al.  Effect of high temperatures on high performance steel fibre reinforced concrete , 2006 .

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

[13]  Jong-Shin Huang,et al.  Fire performance of highly flowable reactive powder concrete , 2009 .

[14]  A. El-Dieb,et al.  Mechanical, durability and microstructural characteristics of ultra-high-strength self-compacting concrete incorporating steel fibers , 2009 .

[15]  Venkatesh Kodur,et al.  Spalling in High Strength Concrete Exposed to Fire: Concerns, Causes, Critical Parameters and Cures , 2000 .

[16]  Albert Noumowe,et al.  Contribution of cocktail of polypropylene and steel fibres in improving the behaviour of high strength concrete subjected to high temperature , 2011 .

[17]  Pierre Kalifa,et al.  High-temperature behaviour of HPC with polypropylene fibres: From spalling to microstructure , 2001 .

[18]  Halit Yazici,et al.  Mechanical properties of reactive powder concrete containing high volumes of ground granulated blast furnace slag , 2010 .

[19]  Wang Guang-yuan,et al.  EXPERIMENTAL RESEARCH ON THE MECHANICAL PROPERTIES OF HSC AT HIGH TEMPERATURE , 2000 .

[20]  O. Bayard,et al.  Fracture mechanics of reactive powder concrete: material modelling and experimental investigations , 2003 .

[21]  Harun Tanyildizi.  Statistical analysis for mechanical properties of polypropylene fiber reinforced lightweight concrete containing silica fume exposed to high temperature , 2009 .