Ingenieurburo Schiessl Gehlen Sodeikat GmbH

München, Germany

Ingenieurburo Schiessl Gehlen Sodeikat GmbH

München, Germany

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Gehlen C.,TU Munich | Kapteina G.,Ingenieurburo Schiessl Gehlen Sodeikat GmbH
Beton- und Stahlbetonbau | Year: 2012

Durability of Reinforced Concrete in Tunnels: Influence of Building Defects The present paper outlines the influence of deficiencies linked to reinforced concrete constructions on the durability. As requirements related to durability matters are in general defined by descriptive guidelines, the objective assessment of deficiencies and the dimensioning of necessary measures for retrofitting are hardly feasible. Whereas a definition of the durability of performance related requirements enables a new procedure to assess deficiencies more objectively. On this basis feasible measures can be chosen and dimensioned. In principle this introduced procedure can also be applied for the performance related assessment of the retrofitted structure. Copyright © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Sodeikat C.,Ingenieurburo Schiessl Gehlen Sodeikat GmbH
Beton- und Stahlbetonbau | Year: 2010

The determination of the water content in construction materials and in particular with regard to its depth and time dependent distribution is of high interest in the area of research, material development and condition assessment of structures. The assessment of the reason of damages mostly require to regard the moisture content of structures, because the moisture content basically affects material properties and the durability of structures. Recently moisture sensors have been used to control the functionality and durability of repair and protection measures. This enables the owner to carry out accurately timed measures to prevent damages due to the ingress of water and chlorides. Copyright © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Mayer T.F.,Sensortec GmbH | Sodeikat Ch.,Ingenieurburo Schiessl Gehlen Sodeikat GmbH
Life-Cycle and Sustainability of Civil Infrastructure Systems - Proceedings of the 3rd International Symposium on Life-Cycle Civil Engineering, IALCCE 2012 | Year: 2012

Reinforcement corrosion is normally the governing deterioration mechanism for infrastructure systems. Tunnel and bridge structures are nowadays usually intended for a service life of 100 years and more, and extensive repair and maintenance works during this service life will cause severe traffic delays and extra costs and shall thus be avoided. Corrosion and moisture monitoring can be a very valuable tool for the service life management of infrastructure systems. In this paper an introduction into the working principle of the sensor systems, possibilities to use the monitoring data for the update of probabilistic deterioration modeling and possible fields of application is given. The findings of these applications are summarized in a further case study which presents the combination of deterioration modeling and a comprehensive monitoring system containing both corrosion and moisture sensors for a current major city tunnel project in Munich.


Stengel T.,Ingenieurburo Schiessl Gehlen Sodeikat GmbH
CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures | Year: 2015

The present paper gives an overview of creep data of UHPC and an appropriate creep function based on this data which was used to compute age-dependent relaxation spectra, i.e. Maxwell chain parameters. The relaxation spectra computed was validated with the help of cracking frame tests. The numerically obtained relaxation spectra enables mechanical studies of members made from UHPC taking into account the agedependent viscoelastic behavior. © ASCE.


Since the publication of the first version of the bulletin in 1990 half-cell potential measurement has been established as a standard test method to detect reinforcement corrosion. In 2014 a new version of the bulletin will be published. Some of the main differences with respect to the former versions will briefly be presented in this paper. Copyright © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Stengel T.,Ingenieurburo Schiessl Gehlen Sodeikat GmbH | Lowke D.,TU Munich | Mazanec O.,TU Munich | Schiessl P.,Ingenieurburo Schiessl Gehlen Sodeikat GmbH | Gehlen C.,TU Munich
Beton- und Stahlbetonbau | Year: 2011

The effect of additions on the production of UHPC and its rheological and mechanical properties was investigated. Quartz, limestone and granulated blast-furnace slag flour as well as two silica fumes were used. The additions affected significantly mixing time and amount of superplasticizer needed to achieve target flowability. A pronounced affect of the additions on the rheological properties relevant to practical application was also observed. Silica fume with low specific surface and limestone flour proved to be the most favourable additions. Regarding the mechanical properties, no appreciable effect of the additions was observed on, in particular, fibre bonding and flexural strength of fibre reinforced concretes. Thus additions replacement is unproblematic from a mechanical point of view. Copyright © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Sodeikat C.,Ingenieurburo Schiessl Gehlen Sodeikat GmbH | Knab F.,Ingenieurburo Schiessl Gehlen Sodeikat GmbH
Beton- und Stahlbetonbau | Year: 2014

Examinations of existing historical buildings become more and more important. Non-destructive testing methods are a very powerful alternative or addition to destructive tests. Frequently they are essential for examination and assessment of existing structures, especially historical ceilings, to get the required information. The achievable density of information is unrivalled. Usage of non-destructive testing methods has to be prepared properly. Before starting tests, the task of the examination should be defined clearly and boundary conditions should be clarified. The article on hand presents three non-destructive testing methods, each important for examination of historical ceiling systems: ultrasonic echo technique, ground radar and measurement by reinforcement scanner. In addition endoscopy is covered as an important supporting tool for non-destructive testing. Usage and limitations of the methods are shown, examples are given. Depending on task, not every method is suitable. Often a combination of non-destructive testing methods is useful or even necessary. Interpretation of the results is not always simple as well. Hence selection of method and interpretation of results need experience. The usage of testing devices by unexperienced personnel is strictly not advisable, especially if the devices provide finally analyzed results without revealing details of the processing similar to a black box. Copyright © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Mayer T.F.,Ingenieurburo Schiessl Gehlen Sodeikat GmbH
Beton- und Stahlbetonbau | Year: 2014

For structures in direct contact with water, the construction of watertight concrete structures has over the past decades been established as a robust, efficient and economical alternative to constructions with an external waterproofing. Design and execution of watertight concrete structures in Germany is regulated by the DAfStb guideline on watertight concrete structures (WU-Richtlinie) This paper presents the fundamentals of the design of watertight concrete structures according to the WURichtlinie. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Beton- und Stahlbetonbau Spezial.


Abstract The article is focused on the phenomenon of mottled dark discoloration, which occur in the late age, i.e. months to years after the production of fairfaced concrete elements. Without countermeasure the extent of the discoloration increases time-dependent. Based on a practical example the phenomenon is described and the main mechanisms that lead to the mottled dark discoloration are shown. Finally, appropriate recommendations for preventing mottled dark discoloration in the late age are made for building practice. Copyright © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


The assessment of the in-situ concrete compressive strength is a common task during projects concerning existing structures and during damage analysis. The standard approach given in DIN EN 13791 is quite disputed, since it might give unsafe results for existing structures [1, 2]. Alternatives are provided by DIN EN 1990 and classical statistics. To find out which approach gives the best results by means of safety and economic efficiency, engineers from our team conducted numeric simulations for different circumstances and evaluated the results according to DIN EN 13791, DIN EN 1990 and by classical statistic methods for the estimation of the 5 %-fractile with a confidence level of 75 %. Result was on the one hand, that the approach given in DIN EN 13791 has, as expected, considerable weaknesses, but beyond, that each of the approaches may be susceptible to errors. Hence they are generally not suitable for replacing the wits and the experience of an engineer. As a support for the engineer at work a reasonable procedure for the estimation of the in-situ concrete compressive strength is suggested, taking into account the results of the numeric simulation and containing hints from the longstanding experience of the authors to avoid typical mistakes. Copyright © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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