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Leipzig, Germany

Konig A.,University of Leipzig | Dehn F.,MFPA Leipzig GmbH
Beton- und Stahlbetonbau | Year: 2015

In the frame of a study, a test method for the evaluation of the acid resistance of concretes was developed which takes particularly the acid specific reaction mechanisms as well as the interaction between acidic liquid and alkaline concrete into account. The evidence of reproducibility of the results gained with the test method has been shown by means of extensive experimental investigations on different types of concrete. The following contribution summarizes the most significant findings and suggests a verification concept for the evaluation of the acid resistance of concretes related to the proposed test method. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source


Kotthoff I.,Ingenieurburo fur Brandschutz bei Fassaden IBF | Hauswaldt S.,MFPA Leipzig GmbH | Riese O.,TU Braunschweig | Riemesch-Speer J.,Deutsches Institute For Bautechnik Dibt
MATEC Web of Conferences | Year: 2016

Exposure to flames of a fully developed room fire venting out of an external wall opening after flash-over is most commonly used as the reference fire scenario for assessing the fire performance of external wall cladding systems. This is reflected by various testing standards (e.g. ISO 13785-2 [1], E DIN 4102-20 [2]). The impact of other fire scenarios had been judged as less critical or most similar in the past. Hence, there was a widespread opinion that other scenarios were covered by these fire tests (cf. [3]). This assumption has also underlain assessment of ETICS fire performance. © 2016 Owned by the authors, published by EDP Sciences. Source


Schmidt J.,MFPA Leipzig GmbH | Orgass M.,MFPA Leipzig GmbH | Renger S.,Landesamt fur Strassenbau und Verkehr | Dehn F.,MFPA Leipzig GmbH
Beton- und Stahlbetonbau | Year: 2014

On May 18, 2013, a truck fire happened in the southern tube of the Tunnel Königshainer Berge - 600 m before the eastern tunnel portal. After the fire, concrete spalling was observed in the crash area. For the evaluation of the damage degree of tunnel lining, sealing, drainage, cable ducts, sidewalks etc. experimental investigations and numerical calculations have been conducted in order to derive repair measures. On the basis of the evaluated fire load, the temperature loading on the tunnel lining was determined - both site- and time-orientated. These information were used to calculate the temperature ingress and distribution and to verify the static and structural effects in comparison to the experimental investigations and material tests. As a conclusion, a repair concept for the structural concrete was derived and executed. Copyright © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source


Different fire scenarios with liquid laugh burns up to 28 tons of gasoline were investigated in a further article. It could be shown that these fires can be covered by the ZTV-ING temperature time curve. Within the framework of a further research project for the Federal Highway Research Institute (BASt), further fire scenarios were investigated, where the fire starts from this liquid laughter fire due to leakage of a tank truck loaded with 28 t gasoline. The fire spread on other vehicles in the tunnel and his effect is einvestigated, whereas a truck laden with wooden pallets is located immediate to the tanker. The present article reflects the significant results in terms of the structural behaviour and the tunnel safety of the investigations carried out by means of computational fluid simulations and finite element calculations. Copyright © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source


Schmidt J.,MFPA Leipzig GmbH | Bergerhausen U.,Bundesanstalt fur Strassenwesen BASt | Dehn F.,MFPA Leipzig GmbH
Beton- und Stahlbetonbau | Year: 2013

Fires in reinforced concrete road tunnels - temperature loads, temperature distribution and concrete spalling Tunnels are important infrastructure constructions. The assessment of the effects of fire events is therefore also of major economic importance. The fire of a tank truck loaded with gasoline represents such a fire event. Part of a research project for the Federal Highway Research Institute (BASt) examined different scenarios for an extreme case, different rates of energy release and their influence on the tunnel safety by means of CFD and FEM simulations. It could be shown that even fire scenarios with liquid laugh burns up to 28t petrol can be covered by the ZTV-ING temperature time curve. The following article summarizes the most important results. Copyright © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

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