MFPA Leipzig GmbH

Leipzig, Germany

MFPA Leipzig GmbH

Leipzig, Germany
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Kaudelka S.,MFPA Leipzig GmbH | Hauswaldt S.,MFPA Leipzig GmbH
Bauphysik | Year: 2017

Investigation of the fire behavior oy polystyrene based ETICS during external fire tests (Part 1). Due to fire incidents with EPS-based ETICS, a project group convened by the German building ministries (Bauministerkonferenz) analyzed collected fire incidents. As a result, it has been found that burning waste containers or motor vehicles in the base area of EPS-based ETICS can constitute a risk. A research project was initiated, which is presented in this article (part 1). The aim was to investigate the fire behavior of these ETICS by means of fire exposure. For this purpose, an external fire scenario (”Sockelbrandszenario“ fire to plinth) was developed in which a representative fire load was defined for large-scale fire tests. As a result, constructive fire protection measures on EPS-based ETICS were investigated and obligatory for approval as flame-retardant ETICS. The pedestal fence scenario is firmly anchored within the scope of the model administrative regulation Technical Building Regulations (MVV TB). This enables the fire protection technology of ETICS based on a representative fire scenario. Part 2 of the article provides a protection objective. Solutions and their technical feasibility are discussed. Copyright © 2017 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin

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.

Richter R.,TU Munich | Juknat M.,MFPA Leipzig GmbH | Grosse C.,TU Munich | Dehn F.,MFPA Leipzig GmbH
Beton- und Stahlbetonbau | Year: 2015

In order to analyze the behaviour of concrete under fire exposure experimental investigations are used [1]. This practice is expensive and very time-consuming. So, it is essential to get as most suitable information out of such experiments as possible. At the present, most standard experiments are only capable of comparing a condition of concrete before and after the experiments [1]. Unfortunately, information of the time-dependent development of the damaging process cannot be resolved. In order to fully understand the mechanism of dynamic concrete damage under fire exposure, this information is crucial. Therefore, it is necessary to develop measurement systems which are able to monitor and detect the entire exposure process and its consequences. These systems should be applied additionally to the temperature monitoring, the visual inspection and a weighting of the specimen before and after the experiments. For this purpose volume-orientated non-destructive testing methods are considered. It is possible to use ultrasonic systems or impact-echo methods, but the most suitable are acoustic emission techniques. With this method it is possible to monitor damage processes of the complete specimen volume and during the whole time of the experiments. The paper will present results of experimental investigations where such systems have been successfully applied to test the feasibility, practicability and the usefulness of different measurement systems to verify the time-dependent development of concrete spalling under fire exposure. © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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.

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.

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.

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.

Herrmann A.,MFPA Leipzig GmbH | Konig A.,MFPA Leipzig GmbH | Dehn F.,MFPA Leipzig GmbH
Cement International | Year: 2015

Research into alternative binders and cement substitutes with distinctively reactive properties is being pursued not only from a technical but increasingly also from an economic and sustainable point of view. Concrete additives which have been known for many years such as fly ash, silica fume and blastfurnace slag, though also other processed secondary raw materials and residues are playing an increasingly important role for concrete construction along with the idea of life cycles. Alkali-activated binders and Geopolymer binders have been repeatedly named in this connection over the past years. Generalised technological and design-relevant principles have to be provided in order to be able to use these so-called alternative binders to produce concrete. Since the properties of concrete that can be achieved with alkali-activated binders largely depend on the raw materials that are used, it would initially appear sensible to suggest a general definition of terms to classify these alternative binders as opposed to conventional cementitious binders. The following article therefore presents a classification of alkali-activated binders as well as Geopolymer binders and at the same time a differentiation to conventional binders taking into account the strength-forming texture and hydraulicity.

Hornig U.,MFPA Leipzig GmbH | Rudolph M.,MFPA Leipzig GmbH
Beton- und Stahlbetonbau | Year: 2016

The main roof of the ”Haus der Kulturen der Welt“ in Berlin. Which is very well-known on account of its history and striking structural design – was to be inspected by the author to determine its condition and analysed with regard to the durability of the existing liquid synthetic sealant. The roof structure consists of a biaxial, curved area-covering structural element with circumferential edge beams of pre-stressed lightweight concrete. This is the result of the reconstruction between 1984 and 1987 following a partial collapse of the then Berlin Congress Hall in 1980. The very thin roof shell is also made of lightweight concrete and, like the edge beams, has a polyurethane-based spray-on seal that was specially developed for this purpose as protection against the ingress of moisture. The reason why this, at the time, novel type of seal was chosen was that it should take into account the fact that the roof design urgently needed some kind of protection against moisture that had to compensate the expected changes shape and crack movements of the roof with no damage. The following article reports on the nature, scope and main results of the analysis of the condition of the roof seal, edge beams and abutments. It will also describe the repair recommendations resulting from the investigations, which form the basis of the execution of work at the present point in time. Apart from presenting the technical principles and special features of the building that have to be taken into account during any repairs, the special features of the execution will also be addressed. Copyright © 2016 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin

Konig A.,MFPA Leipzig GmbH | Rasch S.,SCHWENK Zement KG | Neumann T.,SCHWENK Zement KG | Dehn F.,MFPA Leipzig GmbH
Beton- und Stahlbetonbau | Year: 2010

Up to present, surface protective systems are in use for agricultural buildings, for instance: cot plants, tank construction, silo plants or even biogas fermenter. The aim is to avoid infiltration by concrete- and steel corrosion agents. Concrete with high acid resistance are an alternative to dispense using these surface protective systems. The performance of this special-concrete has to be verified in aggressive media through accelerated storagetests, in accordance with the potential of damage of the equivalent application. Based on the young history of development and the absent access to the buildings, none extensive experiences of the processes of damage are noted for the increasing number of biogas plants. Dependant on the used plant-process engineering, a less biogenic acid attack within the liquid state can be expected. Within the gaseous phase under special conditions i.a. sulfuric acid-, carbonic acid attack and carbonation can simultaneously occur. Currently, in the context of the large-scale research project at the MFPA Leipzig GmbH/Leipzig University, the potentials of damage within biogas plants on damaged buildings as well as embedded samples become analyzed. At the same time new acid resistance concretes, i.a. for agricultural buildings will be developed by accelerated storage-tests. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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