Korrelationen mellan fuktkvot och brandspjälkning i sprutbetong i tunnlar : Ett förberedande arbete inför brandprovning

Sammanfattning: To test the fire resistance of shotcrete, fire tests are performed. There are no euro codes or similar regulations for how the test bodies are to be handled and it is left to the client of the project to prescribe how the tests should be conducted. This sometimes entails unrealistic goals, unreasonable conditions and some room for own interpretations of how the samples are to be handled. Since the moisture in fire testing of shotcrete has a large impact, the moisture ratio in the concrete should be investigated. By extension, this means that the handling process and the drying time of the test bodies must be reviewed. This thesis establishes a management protocol for how the moisture ratio in test specimens in shotcrete should be investigated. The result of such a test must be able to support which drying times are reasonable to mimic the actual conditions of a tunnel in operation. The report also generally addresses the importance of conducting fire tests on shotcrete in tunnels according to the most realistic conditions possible. Therefore, it is important to investigate what requirements are set today in connection with fire tests of shotcrete and how reality-adapted they are.