Experimental and Numerical Investigations of Grouted Joints in Monopiles Subjected to Early-Age Cycling

Lohaus, Ludger; Cotardo, Dario; Werner, Michaël; Schaumann, Peter; Kelma, Sebastian

doi:10.17736/jowe.2015.jdsr03

Cited by 6 publications

(7 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Grout material that hardens under permanent movement can be damaged by several mechanisms. The kinematic energy applied to the liquid grout material, which is to be avoided for self-compacting concrete [10,11], can cause the aggregates to sediment and the cement paste to agglomerate [12], cf. Fig.…”

Section: Influence Of Early Age Movements On the Grout Strengthmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analysis of Early Age Movement in Grouted Connections

Henneberg

Schaumann

2023

ce papers

View full text Add to dashboard Cite

Grouted connections (GC) of offshore structures are susceptible to wave loading and current directly after grouting. Early age movement (EAM) during the curing process can affect the material properties and the interface quality between the grout and the steel structure. Such effects were observed in laboratory tests performed at the Leibniz University Hannover. Generally, EAM can be characterised by high shear rates and identified as a damage mechanism. In this contribution, the authors present a numerical approach that transfers the observed damage mechanism into an ultimate strength analyses of the GCs. For this purpose, EAM simulations and laboratory tests with fluid grout material are combined to determine areas of high shear rates, which mainly affect the grout properties. With an element‐based adjustment approach, the material law of each element is adjusted according to the level of shear rate. The adjusted finite element model is analysed on its maximum axial load resistance.

show abstract

Section: Influence Of Early Age Movements On the Grout Strengthmentioning

confidence: 99%

“…Both have an effect on the durability of the material. Investigations by Lohaus and Cotardo [12,13] show various influences of the EAM on the strength development of the grout. In areas of large movements, there is an increased sedimentation of the aggregates and deaeration.…”

Section: Influence Of Early Age Movements On the Grout Strengthmentioning

confidence: 99%

Numerical Analysis of Early Age Movement in Grouted Connections

Henneberg

Schaumann

2023

ce papers

View full text Add to dashboard Cite

show abstract

“…The strength of the grout and consequently the bearing capacity of the grout annulus can be altered by cyclic displacements since casting. Three major phenomena must be considered according to Lohaus, et al [7]. Horizontally, the application of cyclic displacements / loadings can lead to damage to the grout and to irreversible deformations that can induce the formation of a hole at the groutrock and grout-monopile interfaces.…”

Section: Grout Properties Under Cyclic Loading/displacement Since Casmentioning

confidence: 99%

“…The test device developed at the ULB is inspired by the work of Lohaus, et al [7]. This device was developed to simulate the effect of cyclic movements of the monopile induced by the waves on the hardening of the grout until the end of setting.…”

Section: Segregation Testmentioning

confidence: 99%

“…With numerical simulation, it is then possible to define the displacements of the grout (before setting) or the stresses taken up by the grout (after setting). But other risks which are associated to wave loading include segregation of the grout [7] and ovalization of the grout annulus induced by an accumulation of irreversible deformations taking place during each cyclic displacement/loading. All of these phenomena are shown schematically in the bottom of Figure 1.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of cyclic movement on the hardening process of grout: case of offshore wind turbine installation

Delsaute¹,

Furnémont²,

Königsberger³

et al. 2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

View full text Add to dashboard Cite

The foundation of offshore wind turbines in a rocky seabed is a major technical challenge for engineers. To insure the stability of the wind turbine, the ring between the steel monopile and the seabed is filled with a grout. The objective of this research is to point out the influence of early age movements and deformational restraints on the performance of the grouted connections. Another objective is to evaluate the performance of different grout materials by means of several experimental tests. A first experimental campaign is performed to characterize the behavior of the grout during hardening and to define the stress induced by the restraint of the free deformations. In a second campaign, the behavior of the grout under cyclic displacements since casting is studied. A Temperature Stress Testing Machine (TSTM) has been used to simulate the influence of cyclic horizontal movements by applying cyclic displacements and loadings since casting on samples designed with different grout materials. A segregation device was used to simulate the effect of the waves in the vertical direction. The results of both campaigns are then used to evaluate the risk of damage caused by the movement of the waves during the hardening of the grout. From these newly developed experimental tools, new indicators were developed in order to compare the performance of different grouts under cyclic displacement since casting.

show abstract

Testing Concrete Since Setting Time Under Free and Restrained Conditions

Delsaute¹,

Staquet²

2020

Advanced Techniques for Testing of Cement-Based Materials

View full text Add to dashboard Cite

Experimental and Numerical Investigations of Grouted Joints in Monopiles Subjected to Early-Age Cycling

Cited by 6 publications

References 4 publications

Numerical Analysis of Early Age Movement in Grouted Connections

Numerical Analysis of Early Age Movement in Grouted Connections

Influence of cyclic movement on the hardening process of grout: case of offshore wind turbine installation

Testing Concrete Since Setting Time Under Free and Restrained Conditions

Contact Info

Product

Resources

About