TRC / EPS concrete sandwich plate
Table of contents
Project data
| Titel | Title Untersuchung von Sandwichplatten aus Textil- und Styroporbeton | TRC/Expanded Polystyrene Concrete sandwich plate Förderer | Funding MoET322 Vietnam | Institut für Massivbau, TU Dresden Zeitraum | Period 10.2010 – 10.2014 Leiter | Project Manager Prof. Dr.-Ing. Dr.-Ing. E.h. Manfred Curbach Bearbeiter | Contributor Dipl.-Ing. Viet Anh Nguyen |
Report in the yearbook 2012
Textile Reinforced Concrete / Expanded Polystyrene Concrete Sandwich Plates
Sandwich specimen made of outer TRC layers and polystyrene concrete in the core
Sandwich plates consist of different material layers, which are combined in right way to create a composite section. Hence, depend on the properties of selected materials and form of each layer, the correlated capacity and performance of each material can be optimally utilized. In addition, an application of light weight core can help to reduce the self-weight of the structural element.
A novel sandwich variant, which is currently being studied at the Institute of Concrete Structures, is a combination of textile reinforced concrete and expanded polystyrene concrete. In there, textile reinforced concrete is used for two thin boundary layers. Textile concrete is a combination of high strength carbon textile reinforcement and fine high strength concrete, so the layers could bear not only high tensile but also high compressive force. They are combined with very light and low strength expanded polystyrene concrete. For this type of composite plate, textile concrete layer is assumed to bear the effects because of flexural bending and expanded polystyrene concrete core will bear the effects because of shear force.
Because the mechanical properties of textile reinforced concrete are known, this study will focus on load capacity of expanded polystyrene concrete core. Expanded polystyrene concrete mainly consists of commercial polystyrene balls, sand, cement, silica fume, fly ash, super plasticizer, and water. At the beginning of project, some recipes for expanded polystyrene concrete were tested to obtain a concrete that has density smaller than 1 kg/dm³ with the highest possible compressive and tensile strength. Then, a study on shear resistance of this material could be implemented. Hence, in the next step, the influence of shear to depth ratio on the bearing capacity of this type of composite section and failure modes in four point bending experiment are studied. All of test specimens were fabricated in several layers by wet-in-wet method to achieve a sustainable bond between the layers. Until now, 18 experimental beams with shear to depth ratio in range from 1,5 to 5 have been implemented and evaluated.