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    Composite innovative materials for the works repair: sizing fiabiliste approach  for their requalification and their durability prediction



    Team: Reliability Engineering and Decision-Making tools


    Labeling: Advancity, Sustainable City and Mobility

    Term: 60 months - from 01/10/2015 to 30/09/2020


    Funding: ANR


    LARIS staff involved: David Bigaud, Hassen Riahi, Bruno Castanier, Laurent Saintis

    Project partner : IFFSTAR (pilot), University of Lyon 1 Claude Bernard (co-pilot), University of Angers (co-pilot), National Institute of Applied Sciences of Lyon (INSA Lyon), Central School of Lyon, ARMINES Materials Center of Alès , University of Cergy.


    The built heritage of structures and buildings in France is vast and aging. By way of illustration, a statistical study published by Sétra in 2012 (IQOA, 2012) shows that 23% of bridges require urgent specialized maintenance, 5% require repair work related to structural alteration, and about 1% of bridges has a severe structural deficiency requiring urgent repairs.

    Faced with the need to maintain and bring French building heritage up to standard, the reinforcement of deficient structures by bonding composite materials (laminated fabrics on site or glued rigid slats) is a method of choice for prolonging the life of structures.

    The MICRO research project aims to remove the last obstacles that still limit the large-scale development of this constructive process. More particularly MICRO aims to:

    • to better understand the durability and reliability of bonded composite repairs through a multi-scale analysis of aging mechanisms and a reliability approach. The relative lack of knowledge of the reliability and complex factors governing the durability of these repairs is indeed considered the main lock by practitioners.
    • develop innovative composite reinforcement systems with reduced environmental footprints, based on the use of natural or biosourced constituents and devoid of CMR compounds, in order to anticipate changes in environmental legislation.

    It is mainly with regard to the first objective that LARIS will make its scientific contribution:

    • building and exploiting the results of accelerated and severe tests conducted at multiple scales. This phase of the work will make it possible to identify the different degradation mechanisms of the bonded assembly (at the level of the polymer matrix, the fiber-matrix interface, the composite-concrete interface) and to justify scientifically the choice of the indicators' durability and reliability.
    • redefining the fundamental concepts of reliability and durability of civil engineering systems using composite materials. The project will focus on the probabilization of degradation / aging models and the establishment of statistical laws of service life of structures repaired by bonded composite materials, then the incorporation of these laws into reliable formulations of design equations.

    The LARIS (Angevin Research Laboratory in Systems Engineering) of the University of Angers will be represented by David BIGAUD (Professor) and Hassen RIAHI (Associate Professor). David BIGAUD will also participate in the management of the project.

    IQOA Ponts, Evaluation Campaign 2011, National Dossier published by the Sétra (Study Service on Transport, Roads and their Facilities), July 2012, 45 pages.