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München, Germany

Mittermayr F.,University of Graz | Rezvani M.,TU Darmstadt | Baldermann A.,University of Graz | Hainer S.,TU Darmstadt | And 4 more authors.
Cement and Concrete Composites | Year: 2015

Two newly developed cement-reduced eco-friendly concretes with high limestone powder content and low water/powder ratio were tested for sulfate resistance. Mortar samples with a paste composition of eco- as well as conventional concretes were immersed in 30 g l-1 Na2SO4 and saturated Ca(OH)2 reference solutions for 200 days at 8 °C. To evaluate the reaction mechanisms of progressing sulfate attack a combined approach of mechanical, mineralogical, and microstructural methods was applied. Gypsum and bassanite neo-formations related linearly to the expansion during sulfate exposure, except for one sample where ettringite co-precipitated. Thaumasite formation was not observed in spite of potentially favorable conditions. This is considered to be related to the evolution of the experimental solutions, kinetic effects, and the competing formation of CaCO3 polymorphs triggered by the usage of superplasticizer. Both eco-friendly mixes exhibited a better sulfate resistance than their corresponding reference samples and are therefore suggested to be applicable in low sulfate-loaded environments according to DIN EN 206-1. Eco-friendly concrete based on CEM III/B performed superior against sulfate attack and is expected to withstand even severe sulfate exposure despite a much higher water/cement ratio than required by the standard. © 2014 Elsevier Ltd. Source

With the digitalization of construction the planning and implementation process is undergoing a fundamental methodological transformation. The employment of BIM (Building Information Modelling) permits end-to-end planning. By means of sample projects it is explained how - above all in the service phases conceptual, preliminary and detailed design - intelligent parameterized building models can be set up in bridge and civil engineering. The additional combination with alignment and GIS data in these phases furnishes a flexible and robust basis upon which to create a holistic evaluation of planning concepts. With the application of a parameterized, object-oriented complete model it is possible to realize an integral process chain across the whole planning and implementation period as well as across the entire life cycle. The 3D model contains, apart from the individual structural components, project-specific attributes and information. Coupling the digital model to resource, cost and time scheduling and simulating the construction sequence yield complex 4D and 5D bridge models. © 2016 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

Hassler-Kiefhaber D.,Obermeyer Planen Beraten GmbH | Knittel K.,Ingenieurburo Francke Knittel GmbH | Webler H.,Icon Ing. Buro H. Webler
WasserWirtschaft | Year: 2011

In the state of Rheinland-Pfalz new approaches for the development of flood risk management plans (FRMP) are pursued. Flood risk minimizing measures which can be realized in the near future are prioritized. All parties involved, key players as well as affected citizens, participate in the development process by taking part in a serial of workshops. The FRMP Nahe is a pilot project, developed under guidance of the Water Management Administration. Source

Gebbeken N.,University of Federal Defense Munich | Gebbeken N.,AJG Ingenieure GmbH | Braun M.,Obermeyer Planen Beraten GmbH | Hachmann T.,Obermeyer Planen Beraten GmbH | Yilmaz H.,AJG Ingenieure GmbH
International Journal of Protective Structures | Year: 2012

Most existing built infrastructure, especially historical monuments, has not been designed in accordance with earthquake resistant standards. Earthquake engineering as a specific field of science and practice has only been developed over the past fifty years. Therefore, many buildings across the globe need to be inspected and to be assessed in order to determine their resistance against earthquakes based on today's knowledge. Based on safety standards and a risk assessment, the earthquake engineer provides information to the owner as to use the building in the future in order to fulfill economic as well as safety demands. This paper outlines the inspection procedure, defines the methodology of reconnaissance on site and describes the subsequent assessment of buildings from the practical point of view. Source

Esfahani N.N.,Obermeyer Planen Beraten GmbH | Esfahani N.N.,TU Dresden | Balder R.,Obermeyer Planen Beraten GmbH | Scherer R.J.,TU Dresden
eWork and eBusiness in Architecture, Engineering and Construction - Proceedings of the European Conference on Product and Process Modelling 2012, ECPPM 2012 | Year: 2012

Using computer programs, Intelligent Road Design attempts to establish a connection between two points through an economical path. Born around 30 years ago, Computer Aided Design (CAD) can provide rapid evaluation of alternative alignments, optimization techniques for road planners and powerful search tools for a large number of alternative alignments. Geospatial Information System (GIS) with its spatio-temporal analysis tools is an extremely helpful solution in the very early steps of alignment planning, especially for long railway projects. Therefore Road and Railway (Rd & Rl) Design is a suitable area of help for GIS design applications, as such projects start with topographic maps and map analysis methods. When used together effectively, CAD and GIS fulfill the prerequisites for streamlining decision making and reducing inefficiencies in the design and execution of critical operations. © 2012 Taylor & Francis Group. Source

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