The need of concrete structures restoration in order to ensure their fire resistance can, in engineering practice, occur for reasons of damage to the structure by fire (spalling of concrete cover layer) or by the failure to cover the load-bearing structure during construction. The paper is devoted to the evaluation of the structure cover of the evaluated structure, the determination of temperature distribution in the structure with consideration to the choice of probable fire scenario, subsequent determination of critical temperature of the structure and the optimization of possible methods of the restoration of damaged or wrongly made constructions.
The contribution presents two basic variants of fire compartmentation. A conservative standard design is confronted with an atypical design supported by the mathematical modelling of temperature field. In both the cases, the required level of safety is ensured. The atypical design in this case enables the use of more available and economically profitable products ensuring the fire safety of the structure.
The subject of the article is to inform the experts about results of a set of fire resistance tests of light concretes designed for traffic and tunnel structures. In addition to commonly used recipe C 30/37 FX4, corresponding version of light concrete class LC 35/38/XF 4 was tested. One of the goals of the tests was verification of behaviour of “road” (XF4) concretes under the most demanding conditions of fire, especially in road tunnels. In addition to standard curve, the hydrocarbon and Eureka curves were used for the fire tests. The loading curves differ from normally used standard curve especially in the temperature rise speed (temperatures over 1,000°C are reached within a couple of minutes). In this case, real concrete moisture and possibility to remove water steams from a component are substantially important for the fire safety (integrity).
The article describes partial results of the research of fire and technical properties of lightweight concrete with regard to the possibility of the application of lightweight concrete in tunnel structure wall lining. The article summarises partial results of individual parts of the project focused on the specification of material properties, execution of temperature analysis of the fire resistance, calculation of structure heat transmission and specification of the thermal response of the material as subject-matter to the research.
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