Fire resistant behavior of newly developed bottom-ash-based cementitious coating applied concrete tunnel lining under RABT fire loading

Abstract When tunnels are exposed to prolonged fires, they are likely to suffer heavy damage and partial collapse. Because of the difficulties involved in repairing tunnels damaged by fire, the application of fire protection coatings as a preventive measure has been widely used. The application of such coatings is a relatively simple construction method that is effective in protecting tunnel structures from collapse. However, the coating materials currently available are rather expensive and have low compressive and tensile strengths. Low strengths of coating materials can lead to fatigue failure and spalling of the tunnel linings, both during fire loading, due to internal evaporative pressure, and after fire loading, due to negative pressure from service traffic. This paper presents a newly developed fire-protection cementitious coating material, which can resist both fire and service traffic loadings. The newly developed coating material is low in cost and high in strength, qualities achieved by using bottom ash as the fine aggregate. Polypropylene fibers are used to release internal evaporative pressure via melting during thermal loading, providing a pass-through channel. The developed coating material is experimentally evaluated by means of static strength tests and RABT fire loading tests using an LPG furnace. The strength properties, failure mechanisms, and thermal protection study results for this material are discussed in detail.

[1]  J Holst.  Repair of the Limfjord Tunnel, Denmark - evaluation of experience obtained after completion concerning lifetime considerations and future effects on costs of operation, maintenance and repair , 2004 .

[2]  Yoshiyuki Kojima,et al.  Tunnel maintenance in Japan , 2003 .

[3]  P. K. Mehta.  Concrete: Structure, Properties, and Materials , 1992 .

[4]  G. A. Khoury,et al.  Concrete spalling assessment methodologies and polypropylene fibre toxicity analysis in tunnel fires , 2008 .

[5]  Roman Lackner,et al.  How do polypropylene fibers improve the spalling behavior of in-situ concrete? , 2006 .

[6]  Jong-Pil Won,et al.  High Strength Polymer-Modified Repair Cementitious Composite for Fire Protection , 2007 .

[7]  G. Bonnet,et al.  Analyses of Heated Concrete Spalling due to Restrained Thermal Dilation: Application to the “Chunnel” Fire , 2006 .

[8]  Mridul Garg,et al.  Perlite-based building materials — a review of current applications , 1991 .

[9]  Pam Basheer,et al.  Surface treatments for concrete: assessmentmethods and reported performance , 1997 .

[10]  Kristian Dahl Hertz,et al.  Limits of spalling of fire-exposed concrete , 2003 .

[11]  Haukur Ingason,et al.  Recent Achievements Regarding Measuring of Time-heat and Time-temperature Development in Tunnels , 2004 .

[12]  Pirjo Pietikäinen,et al.  Silane Functionalized Ethylene/Diene Copolymer Modifiers in Composites of Heterophasic Polypropylene and Microsilica , 2007 .

[13]  Yun Bai,et al.  Strength and Drying Shrinkage Properties of Concrete Containing Furnace Bottom Ash as Fine Aggregate , 2005 .

[14]  G. Khoury.  Effect of fire on concrete and concrete structures , 2000 .

[15]  Masafumi Narikawa,et al.  Application of recycled coarse aggregate by mixture to concrete construction , 2007 .

[16]  K. Sakr,et al.  Effect of high temperature or fire on heavy weight concrete properties , 2005 .

[17]  G. Amarendra,et al.  Thermochemical degradation of limestone aggregate concrete on exposure to sodium fire , 2008 .

[18]  Mine Kaya,et al.  Usage of coal combustion bottom ash in concrete mixture , 2008 .

[19]  O. Arioz.  Effects of elevated temperatures on properties of concrete , 2007 .

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

[21]  Mathew P. Tharaniyil,et al.  APPLICATION OF FOUNDRY BY-PRODUCT MATERIALS IN MANUFACTURE OF CONCRETE AND MASONRY PRODUCTS , 1996 .

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

[23]  Gabriel Alexander Khoury,et al.  PASSIVE FIRE PROTECTION IN TUNNELS , 2003 .

[24]  Venkatesh Kodur,et al.  Optimization of the type and amount of polypropylene fibres for preventing the spalling of lightweight concrete subjected to hydrocarbon fire , 2004 .

[25]  Bernard Schrefler,et al.  Towards prediction of the thermal spalling risk through a multi-phase porous media model of concrete , 2006 .

[26]  J. P. Copsey,et al.  Design of precast concrete segmental tunnel linings , 1987 .

[27]  J. Papayianni,et al.  Residual mechanical properties of heated concrete incorporating different pozzolanic materials , 1991 .

[28]  K. W. Nasser,et al.  Effects of High Temperature and Pressure on Strength andElasticity of Lignite Fly Ash and Silica Fume Concrete , 1996 .

[29]  H A Russell.  ITA guidelines for structural fire resistance of road tunnels , 2004 .

[30]  Yong C. Wang,et al.  The effect of water movement on specific heat of gypsum plasterboard in heat transfer analysis under natural fire exposure , 2004 .

[31]  C. Tang,et al.  Spalling of concrete cover of fiber-reinforced polymer reinforced concrete under thermal loads , 2005 .

[32]  J. T. Robinson,et al.  Fire safe structural design , 1987 .