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Concrete mix design for tidal turbine foundation
RISE Research Institutes of Sweden, Samhällsbyggnad, Infrastruktur och betongbyggande.ORCID-id: 0000-0003-1358-2364
RISE Research Institutes of Sweden, Samhällsbyggnad, Infrastruktur och betongbyggande.ORCID-id: 0000-0001-5760-4874
2021 (Engelska)Rapport (Övrigt vetenskapligt)
Abstract [en]

The Sabella D10 tidal turbine was immersed in the Fromveur Strait in June 2015 and became the first, and at the time only, grid-connected full scale marine current turbine (MCT) in France. However, the future of MCT industrial projects lies in lowering the levelized cost of electricity (LCOE). Evaluating new possibilities to design a competitive foundation will be a key issue for the future commercial development of SABELLA’s technology. The purpose of CF2T project is to develop a competitive foundation, immerse it as part of a precommercial project and validate the concept in real sea environment. The innovative foundation was designed to decrease construction costs, with modular interfaces to allow an installation in several packages (foundation parts, ballasts, turbine) in order to limit the installation vessel’s crane capacity requirement, which will also reduce installation costs. A concrete foundation with steel footings and turbine bed were considered to lower the manufacturing costs and increase the foundation durability comparing to currently used steel foundations. RISE Infrastructure and Concrete Technology supported the process of concrete material selection and casting technology. The material design was preceded with numerical analysis of early cracking due to hydration heat development, which indicated that there exists a substantial risk of thermal cracking. Three different variants of concrete mixes complying the design strength and stiffness criteria with low hydration heat were developed concerning various available casting technologies. The mixes were tested for standard concrete properties: compressive and flexural strength, modulus of elasticity, consistency, and shrinkage. The selected materials were submitted to accelerated durability testing including shrinkage and chloride migration. A basic life cycle analysis (LCA) of the concrete material, manufacturing was performed and compared to steel foundation solution to assess the sustainability of the designed structural and material solutions. The innovative concrete foundation and traditional steel foundation with D14 turbines are meant to be monitored with a specially developed sensors and data acquisition system in real sea environment.

Ort, förlag, år, upplaga, sidor
2021. , s. 49
Serie
RISE Rapport ; 2022:02
Nyckelord [en]
Concrete, marine structure, mix design, FEM, hydration heat, durability, LCA
Nationell ämneskategori
Samhällsbyggnadsteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-73108ISBN: 978-91-89561-17-5 (digital)OAI: oai:DiVA.org:ri-73108DiVA, id: diva2:1856628
Tillgänglig från: 2024-05-07 Skapad: 2024-05-07 Senast uppdaterad: 2024-05-07Bibliografiskt granskad

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Suchorzewski, JanDuring, OttoPrieto Rábade, Miguel

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