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Sept | OXAND zoekt afstudeerder van TU Delft

Per direct zijn wij op zoek naar een afstudeerder van de TU Delft voor onderzoek naar ‘Ageing phenomena in civil structures: validation concrete modelling approaches’.

Ageing phenomena in civil structures

OXAND Netherlands was founded in 2008 and until January 1 2015 was known as Iter Fidelis. We offer integrated solutions in asset, ageing & risk management and our client portfolio in the Netherlands consists of investors, asset owners, contractors and managers in Transportation (Roads, Waterways, Rail, Ports, Airports) and public and private property.

OXAND operates in a growing international market and is part of the OXAND Group with offices in France, Switzerland, Canada and United Kingdom and contributed to over a 1,000 projects worldwide and has 130 consultants. We enable our clients to take better (knowledge-based) decisions for minimum risk performance throughout the lifecycle of their assets. This leads to optimal financial results and improves the performance of assets, thus extends the reputation of the client. OXAND supports contractors in winning tenders, controlled realisation of projects and responsible maintenance of assets. OXAND works on DBFM(O), Maintenance, Design & Construct -and Performance Contracts for locks, tunnels, roads, buildings, rail and energy.

OXAND’s in-house developed platform – SIMEO™ – provides an integrated IT solution to support decisions in Asset Management. SIMEO™ ensures the right balance between performance, risk and finance at every stage of a project or an asset.

The internship and related research questions are:
The application platform Simeo is made of several modules. A dedicated module, i.e. the “Ageing Simulator”, aims at modelling of ageing infrastructure. This module encompasses a library of materials’ ageing laws based on various types of ageing models e.g. (chemical) physical, statistical, etc. models.

The physical models in the Simeo platform include simulation of steel corrosion in reinforced concrete structures. These models have been validated so far by using real experimental data from field tests and applications mainly in France and Switzerland. To facilitate the acceptance of these models in the Netherlands, it is important to know whether the used approaches are consistent with the material’s performance, field applications and numerical simulations, in terms both knowledge and experience, available in the Netherlands. Therefore, Oxand, together with TU Delft, will explore one or more of the following research questions, which form the objectives of the internship project:

1. Validation of the Simeo concrete corrosion model (chloride and/or carbonation induced corrosion) through implementation of experimental data and/or modelling approaches, available within Delft University of Technology. This objective will be facilitated by results, available in TU Delft, including outcomes from PhD projects within the IS2C program.

2. Improving the existing Simeo models by implementing recent research findings on critical chloride thresholds for corrosion initiation and propagation for various concrete mixtures (sensor technology, validated through electrochemical performance of embedded steel).

Additional objectives (second priority):
3. Extension of the Simeo database of material properties with input for modified concrete mixtures and relevant performance e.g. blast furnace slag concrete, admixtures as fly ash, silica fume, etc. with relevance to research questions 1 and 2.

4. Validation of the updated part (Bayesian approach) of the ageing model by using field data from a chosen Dutch application.

Solution approach:
The graduate student will perform his work at OXAND. The OXAND concrete ageing model and the already available field data will be used to validate the model for generic applications. This will justify the application of the model to phenomena and processes, related to concrete ageing, which are aspects not yet present in the existing database. For a good and reliable scientific base, the graduate student will make use of models that are also available from the literature, e.g. the FIB model code and various material models.

Expected result:
The intended result is a proven concept that OXAND can show its clients that the concrete ageing models we use are in line with the demand from its clients regarding lifetime predictions, even when there is no real-world data available. A validation for new clients in the Netherlands includes a verification with Regulation and Design requirements of DBFM contracts.

Administrative information:
Background required: BSc in materials, chemical, civil engineering
Salary: €800,- bruto
Duration: internship of 6-12 months
Start date: asap

Contact TU-Delft: Dr.ir. D.A. (Dessi) Koleva (D.A.Koleva@tudelft.nl) and Dr. ir. A. (Ton) van Beek (A.vanBeek-2@tudelft.nl), Section Materials and Environment, Faculty of Civil Engineering and Geosciences

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