This thesis takes part of the FUI project PAREX-IT (PARement EXtérieur pour l'Isolation Thermique). Its main purpose is to develop an efficient insulating coating from the outside, for refurbishment. More particularly, this work investigates the mechanical bond behaviour between this solution and its structural substrate. This thermal insulation is 4 cm thick and pneumatically placed. Considering a coated wall, solicited by wind or seismic loads, this configuration implies a load transfer from the structure to the insulating coating, through the interface between those two materials. The interfacial strength is though considered here as the critical area for a good sustainability of this complex. Meanwhile an equivalent study has been made on a more classical coating, by comparison. Two different scales have been studied. First, a local scale study to determine a failure criterion of this interface, which have been solicited in different states of stresses provoking its failure. However, the important differences of mechanical properties between the tested coatings and the mechanical support can, according to bibliography, provoke stress concentration. A numerical analysis has been conducted to quantify their influence on the parameters of the experimental criterion, for the two tested coatings. At a wall scale, a masonry submitted to shear loads was studied. The objective was to compare the behaviour between a coated wall and an uncoated one, considered as reference. In a second time, a numerical study was performed to confirm the criteria obtained at the local scale. Image correlation has been used to compare the experimental and numerical behaviours to facilitate modelling validation.
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