Géopolymérisation et activation alcaline des coulis d’injection : structuration, micromécanique et résistance aux sollicitations physico-chimiques

Abstract : The need for more durable, rational and ecological constructions encourages innovation and the search for alternatives, such as geopolymerization and alkali-activation, with a growing interest. These technologies allow the use of resources with a lower environmental impact in developing a new class of materials. However, both reaction mechanisms are complex and some issues need further investigation before a proper implementation: the confusion between these processes, the absence of a rational design approach, the lack of knowledge concerning some mechanisms of degradation, etc. The present thesis joins this dynamic and aims at a better understanding of geopolymers and alkali activated materials to design soil injection grouts. An experimental program has been established based on selected mix designs to study their main properties. The differences between both structuration processes were determined through a physicochemical study (XRD, NMR). They were correlated to the macroscopic phenomena observed at early age. An optimization of the mixtures was carried to satisfy the application criteria and define the parameters controlling the rheological and mechanical behavior of the grouts. Using a micromechanical characterization and multiscale homogenization, a methodology has been designed to determine the elastic modulus of the materials.This can be used as a first tool to analyze the global mechanical behavior. Finally, the sensitivity to drying and exposure to acid environments was assessed.
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Anass Cherki El Idrissi. Géopolymérisation et activation alcaline des coulis d’injection : structuration, micromécanique et résistance aux sollicitations physico-chimiques. Génie civil. École centrale de Nantes, 2016. Français. ⟨NNT : 2016ECDN0015⟩. ⟨tel-02193725⟩

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