Search

The aim of this study was to develop a lightweight composite facade element for new buildings and for the refurbishment of existing facades. These composite elements have been developed combining an insulation layer of autoclaved aerated concrete (AAC) with an external ultrahighperformance concrete (UHPC) supporting layer. This solution allows avoiding the use of connectors and facilitates the production procedure. The structural behavior of the facade elements is mainly influenced by the presence of the upturning edges that are able to increase the stiffness of the element and reduce the thickness of the external layer. The insulation material has no influence on the structural behavior of the UHPC boxes. Flexural tests were carried out to investigate a potential detachment of the external layer from the upturning edge. The photogrammetric Analysis used during the flexural tests essentially confirmed that the bond between the two UHPC layers cast in two steps is reliable. The quality of the bond between the external layer and the upturning edge is a key parameter to define the bearing capacity of the element.

Inacceptable capability and durability of joint sealing systems but also inadequate traffic performance (noise emission; overrolling comfort) up to traffic safety aspects reflect the still enormous demand for data-based description of concrete pavements performance under heavy loading conditions. Especially the deformation behavior of concrete pavement slabs in the joint region in consideration of new pavement construction types and improved concrete mixtures meanwhile established but also under the steeply rising traffic loads is not sufficiently explored. To create a data basis for advanced design rules, evaluation methods and product standards - and with it to improve quality, durability and finally sustainability of pavements - an innovative 3-D sensor system SENSO JOINT adapted to german roadworking requirements and suitable for heavy-duty operating conditions was developed. The contribution introduced describes the development of an extensive technical solution based on the analysis of decisive loads, interactions and boundary conditions. Based on calibration data, results of laboratory testing and finally field-testing on different concrete pavement construction types the outcome of a multi-level evaluation process shall introduce the potential of the new sensor system.

In the framework of the European project H-House various concrete façade elements were developed with the aim to ensure a long service life by combining a very durable material with selfcleaning properties. The façade elements presented are made of a shell of UHPC filled with blocks of aerated autoclaved concrete as insulating material. Self-cleaning properties were realized amongst others by imprinting a microstructure into the surface during casting. The paper focuses on selected technological aspects of the manufacturing process of prototypes which had to be performed in two concreting sections. Furthermore the challenges faced when upscaling the self-cleaning properties are addressed and the strategy to assess the self-cleaning properties by measuring the contact and the rolloff angel is presented. The results show that a successfull upscalaing process requires detailed planning and that the best results can often be achieved with a moderate work effort or material use.

The European building sector is moving towards more complex and high-tech building approaches. While focusing on energy efficiency, aspects, e.g. occupant health, sustainability and life-cycle costing are often neglected. This study highlights the potential of earthen plasters in combination with natural ventilation for low-tech solutions. The EU-funded project [H]house established the outstanding performance of earthen materials in light of hygrothermal and air-purifying properties, which were further supported by experimental data from monitoring of naturally ventilated pilot buildings in Berlin. Additionally, [H]house demonstrated through LCC an increased cost-efficiency of earth-based low-tech solutions in comparison with conventional constructions relying on mechanical ventilation.

Aus Anlas der ersten Heirat stellte Kepler Nachforschungen uber seine Vorfahren an. Er fand, das einem seiner Vorfahren von Kaiser Sigismund, seit 1410 Kaiser, im Jahre 1430 der Adelstitel verliehen worden war. Spater verarmte die Familie, und sein Ururgrosvater gebrauchte den Adelstitel nicht mehr, als er sich in Nurnberg einem burgerlichen Gewerbe zuwandte. Sein Sohn ubersiedelte nach Weil der Stadt, und Keplers Grosvater, der dort Burgermeister-wurde, lies sich von Kaiser Maximilian II. im Jahre 1564 den Adelsbrief erneuern, ohne das sich an der burgerlichen Existenz der Familie etwas anderte.

An der kunftigen Wirkungsstatte Keplers waren inzwischen einige Veranderungen eingetreten. Brahe hatte Order erhalten, seine provisorisch auf Schlos Benatek eingerichtete Sternwarte nach Prag zu verlegen, da der Kaiser den beruhmten Astronomen in seiner Nahe wissen wollte. Er zeigte Interesse am Fortgang der Arbeiten sowie an der Alchemie und schatzte gelegentlich astronomische Gesprache unter astrologischen Gesichtspunkten. Fur die Belange Brahes war ein Haus erworben worden, in dem auch fur Kepler eine Wohnung vorgesehen war.

Als Professor an der obersten Klasse der evangelischen Stiftsschule in Graz oblag ihm zunachst nur der Unterricht in Mathematik, was Kepler weder zeitmasig noch geistig auslastete, zumal die Zahl seiner Horer nicht gros war. Um eine hohere Besoldung zu erhalten, verpflichtete er sich noch zur Ubernahme weiterer Facher: Latein und Rhetorik.

Nach seiner Ruckkehr von der Frankfurter Herbstmesse blieb Kepler nur wenige Tage in Ulm und reiste dann zu seiner Familie nach Regensburg, wo er drei Wochen blieb. Die Sorge um die Zukunft trieb ihn nach Prag. Kurz vor Weihnachten begann er die Reise uber den Bohmerwald, die gerade im Winter nicht angenehm gewesen sein wird. Ende Dezember traf er in Prag ein, wo die Entscheidung uber sein ferneres Geschick fallen sollte.

Unter Verwendung photographischer Meteorbeobachtungen des Observatoriums Ondřejow wird die Beziehung zwischen der Anfangsmasse der Meteoriten m∞ und ihrer Endhohe He abgeleitet.