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An Alkali Activated Binder for High Chemical Resistant Self-Leveling Mortar

Open Journal of Composite Materials 2016年第4期6卷 132-142页

作者： Henrik L. Funke sandra gelbrich Lothar Kroll Institute of Lightweight Structures Technische Universitat Chemnitz Chemnitz Germany

This paper reports the development of an Alkali Activated Binder (AAB) with an emphasis on the performance and the durability of the AAB-matrix. For the development of the matrix, the reactive components granulated slag and coal fly ash were used, which were alkali activated with a mixture of sodium hydroxide (2 - 10 mol/l) and aqueous sodium silicate solution (SiO2/Na2O molar ratio: 2.1) at ambient temperature. A sodium hydroxide concentration of 5.5 mol/l revealed the best compromise between setting time and mechanical strengths of the AAB. With this sodium hydroxide concentration, the compressive and the 3-point bending tensile strength of the hardened AAB were 53.4 and 5.5 MPa respectively after 14 days. As a result of the investigation of the acid resistance, the AAB-matrix showed a very high acid resistance in comparison to ordinary Portland cement concrete. In addition, the AAB had a high frost resistance, which had been validated by the capillary suction, internal damage and freeze thaw test with a relative dynamic E-Modulus of 93% and a total amount of scaled material of 30 g/m2 after 28 freeze-thaw cycles (exposure class: XF3).

关键词： Alkali Activated Binder Geopolymer Durability Chemical Resistance

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Function-Integrative Textile Reinforced Concrete Shells

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Open Journal of Composite Materials 2018年第4期8卷 161-174页

作者： sandra gelbrich Henrik L. Funke Lothar Kroll Institute of Lightweight Structures Technische Universit&auml t Chemnitz Chemnitz Germany

This paper presents the development and technological implementation of textile reinforced concrete (TRC) shells with integrated functions, such as illumination and light control. In that regard the establishment of material, structural and technological foundations along the entire value chain are of central importance: From the light-weight design idea to the demonstrator and reference object, to the technological implementation for the transfer of the research results into practice. The development of the material included the requirement-oriented composition of a high-strength fine grained concrete with an integrated textile reinforcement, such as carbon knitted fabrics. Innovations in formwork solutions provide new possibilities for concrete constructions. So, a bionic optimized shape of the pavilion was developed, realized by four connected TRC-lightweight-shells. The thin-walled TRC-shells were manufactured with a formwork made of glass-fibre reinforced polymer (GFRP). An advantage of the GFRP-formwork is the freedom of design concerning the formwork shape. Moreover, an excellent concrete quality can be achieved, while the production of the precast concrete components is simple and efficient simultaneously. After the production the new TRC-shells were installed and assembled on the campus of TU-Chemnitz. A special feature of the research pavilions are the LED light strips integrated in the shell elements, providing homogeneous illumination.

关键词： Textile Reinforced Concrete Carbon Reinforced Concrete Textile Reinforced Composites Function-Integrated Lightweight Structures Glass-Fibre Reinforced Polymer Formwork Thin-Walled Shells

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Unsymmetrical Fibre-Reinforced Plastics for the Production of Curved Textile Reinforced Concrete Elements

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Open Journal of Composite Materials 2014年第4期4卷 191-200页

作者： Henrik L.Funke sandra gelbrich Andreas Ehrlich Lars Ulke-Winter Lothar Kroll Institute of Lightweight Structures Technische Universitat ChemnitzChemnitzGermany

A new constructive and technological approach was developed for the efficient production of large-dimensioned, curved freeform formworks, which allow the manufacturing of single and double-curved textile reinforced concrete elements. The approach is based on a flexible, multi-layered formwork system, which consists of glass-fibre reinforced plastic (GFRP). Using the unusual structural behavior caused by anisotropy, these GFRP formwork elements permit a specific adjustment of defined curvature. The system design of the developed GFRP formwork and the concrete-lightweight-elements with stabilized spacer fabric was examined exhaustively. Prototypical curved freeform surfaces with different curvature radii were designed, numerically computed and produced. Furthermore, the fabric’s contour accuracy of the fabric was verified, and its integration was adjusted to loads.

关键词： Anisotropic Formworks Textile-Reinforced Concrete Fibre-Reinforced Plastics Curved Concrete

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Fiber-Reinforced Polymers Based Rebar and Stirrup Reinforcing Concrete Structures

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材料科学与工程（中英文A版） 2018年第2期8卷 47-54页

作者： Marco Lindner Konrad Vanselow sandra gelbrich Lothar Kroll Faculty of Engineering Technische Universitat Chemnitz Chemnitz 09107 Germany

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