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Ein großer Teil der weltweit vorhandenen Silos ist über 50 Jahre alt und bedarf in den kommenden Jahren einer Erneuerung oder Sanierung. So war bei einem im Jahr 1962 erbauten Doppelkammersilo aus Spannbeton mit einem Fassungsvermögen von 20 000 t Zucker eine Rissinstandsetzung erforderlich. Im Rahmen einer Voruntersuchung wurde hierfür ein Vergleich möglicher Instandsetzungsverfahren durchgeführt. Im Ergebnis wurde die Verstärkung mit Textilbeton gewählt. Für die ca. 3 100 m2 große Sanierungsfläche wurden ca. 14 000 m2 textile Bewehrung sowie ca. 150 t Feinbeton verbaut. Crack repair of a sugar silo Worldwide, a great part of the existing silos is older than 50 years and require renovation in the coming years. For example, crack repair was necessary for a twin compartment silo, which is made of prestressed concrete and can hold up to 20 000 t of sugar, from 1962. In this context, a preliminary investigation was made with the aim of comparing the different possibilities for restoration. Eventually, strengthening through textile reinforced concrete was chosen. Approximately 14 000 m2 of textile reinforcement and 150 t of fine grained concrete were used for approximately 3 100 m2 restoration area. [ABSTRACT FROM AUTHOR]

Abstract: The use of textile reinforced concrete (TRC) is a very effective method for strengthening reinforced concrete (RC) constructions. Within the Collaborative Research Centre 528 of the Technische Universität Dresden (TU Dresden) vast research on TRC was carried out, so as to examine the use of TRC for subsequently strengthening the bending load capacity of existing concrete or reinforced concrete components. As a rule, the experimental research was done at small format reinforced concrete slabs with span widths of 1.60m and slab thicknesses of 0.10m strengthened with TRC. At the same time calculation models were developed to predict the maximum bending load capacity of the reinforced components amongst others. This article describes the experimental and theoretical research reassessing the assignability of the results gained until now to large scale reinforced concrete slabs with a span width of 6.75m and slab thickness of 0.23m. By using textile high-performance carbon reinforcements based on so-called heavy-tow-yarns very high strengthening levels can be realized. The results show significant load bearing capacity increases compared to unreinforced reference slabs. Thus the safe use of bending reinforcements consisting of TRC could be demonstrated for components with even large span widths and high reinforcement degrees. Simultaneously a distinct decrease of deflection with growing reinforcement degree was verified at a comparable load level. Calculation results of the presented simplified calculation model for the estimated bending measurement are consistent with the load carrying capacities determined experimentally. Using the finite element method (FEM) not only the load bearing capacities but also the deformations were calculable keenly. [Copyright &y& Elsevier]