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Segment test to investigate early age movement in grouted connections of offshore wind turbines
Cementitious grout materials are regularly used in structural – and especially in wind energy engineering – as filler material e.g. when joining metallic building members. During the hardening process, it is crucial to protect the grout material from any mechanical agitation, the so called ‘early age movement’, which is not always possible. Previous research showed indifferent results regarding the impact of early age movement on grouted connections. The occurring damage phenomena were not fully understood. To close this knowledge gap, a novel test setup is developed to investigate, how early age movement influences the material and interface properties of cementitious materials in composite connections using the example of grouted connections. A simplified mechanical model depicting the grout stiffness development during hydration is introduced to analyse load redistributions and realistic loading of the grout at different points in time. Comparing two loading protocols reveals a severe difference in the stress distribution experienced by the grout. Loading and transition boundaries play a decisive role for possible damage phenomena. The results of a test under axial and lateral early age movement are analysed according to load redistributions and hysteresis development, showing that the stiffening grout continuously reduced the movement until an intact bond is reached. However, analyses of samples subjected to early age movement indicate a slight reduction of their compressive strength.
Segment test to investigate early age movement in grouted connections of offshore wind turbines
Cementitious grout materials are regularly used in structural – and especially in wind energy engineering – as filler material e.g. when joining metallic building members. During the hardening process, it is crucial to protect the grout material from any mechanical agitation, the so called ‘early age movement’, which is not always possible. Previous research showed indifferent results regarding the impact of early age movement on grouted connections. The occurring damage phenomena were not fully understood. To close this knowledge gap, a novel test setup is developed to investigate, how early age movement influences the material and interface properties of cementitious materials in composite connections using the example of grouted connections. A simplified mechanical model depicting the grout stiffness development during hydration is introduced to analyse load redistributions and realistic loading of the grout at different points in time. Comparing two loading protocols reveals a severe difference in the stress distribution experienced by the grout. Loading and transition boundaries play a decisive role for possible damage phenomena. The results of a test under axial and lateral early age movement are analysed according to load redistributions and hysteresis development, showing that the stiffening grout continuously reduced the movement until an intact bond is reached. However, analyses of samples subjected to early age movement indicate a slight reduction of their compressive strength.
Segment test to investigate early age movement in grouted connections of offshore wind turbines
Possekel, Joshua (Autor:in) / Strybny, Bastian (Autor:in) / Haist, Michael (Autor:in) / Lohaus, Ludger (Autor:in) / Ghafoori, Elyas (Autor:in) / Schaumann, Peter (Autor:in) / Technische Informationsbibliothek (TIB) (Gastgebende Institution)
2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC:
690
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