Details
| Original language | English |
|---|---|
| Article number | 137883 |
| Number of pages | 17 |
| Journal | Construction and Building Materials |
| Volume | 444 |
| Early online date | 14 Aug 2024 |
| Publication status | Published - 20 Sept 2024 |
Abstract
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.
Keywords
- Cementitious material, Early age cycling, Early age movement, Grouted connection, Hysteresis, Stiffness development
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Materials Science(all)
- General Materials Science
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In: Construction and Building Materials, Vol. 444, 137883, 20.09.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Segment test to investigate early age movement in grouted connections of offshore wind turbines
AU - Joshua, Possekel
AU - Bastian, Strybny
AU - Michael, Haist
AU - Ludger, Lohaus
AU - Elyas, Ghafoori
AU - Peter, Schaumann
N1 - Publisher Copyright: © 2024 The Authors
PY - 2024/9/20
Y1 - 2024/9/20
N2 - 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.
AB - 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.
KW - Cementitious material
KW - Early age cycling
KW - Early age movement
KW - Grouted connection
KW - Hysteresis
KW - Stiffness development
UR - http://www.scopus.com/inward/record.url?scp=85201255009&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2024.137883
DO - 10.1016/j.conbuildmat.2024.137883
M3 - Article
AN - SCOPUS:85201255009
VL - 444
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
M1 - 137883
ER -