I. Abstract, .. , I. Experimental, and .. , 130 II. Introduction 131 III.2 Aging methods 131 III.3 Analysis and characterization, 131 III.1 Materials......... 132 III.3.5 Scanning Electron, p.133

I. Results and D. , 133 IV.1 Evaluation of the surface degradation: 133 IV.2 Evaluation of the bulk degradation, Thermogravimetry analysis, p.135

E. , I. Experimental, and .. , 143 I 143 II. Introduction III.3 Analysis and characterization, 144 III.1 Materials, pp.145-145

I. Results and D. , 146 IV.1 Influence of the finish on the surface degradation, p.147

.. Influence-on-the-thermal-characteristics, 151 IV.3.1 Twaron fibres, p.152

.. Influence-on-the-mechanical-properties, 156 IV.5.1 Twaron fibres, p.157

E. , I. Abstract, and .. , 162 II. Introduction, 162 III. Materials and methods 164 III.2 Aging methods.. 164 III.3 Mechanical characterization: tensile tests, p.164

I. Results and D. , 165 IV.1 Consequences of aging on mechanical properties, p.168

C. , V. Acknowledgement, and .. , 171 VII 171 VIII. Complément: prédiction de la durée de vie des fibres aramides en milieux alcalins 173 VIII.2 Prédictions des durées de vie des fibres Twaron 1000, 174 VIII.2.2 Vieillissements à, p.177

I. Abstract, .. , I. Experimental, and .. , 181 II. Introduction 184 III.2 Aging methods 187 III.5 Characterization of the viscoelastic and viscoplastic behaviour, 184 III.1 Materials.................... 188 III.5.3 Identification of the model parameters

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. Teijin, Twaron and Technora -strong rope and cable lightweights

. Ensuite, ensimage sur le vieillissement en environnement alcalin révèle que non-seulement la présence d'ensimage permettait de limiter l'abrasion entre les fibres, mais pouvait également jouer un rôle de protection vis-à-vis de l'hydrolyse. Enfin, la comparaison de l'évolution des propriétés mécaniques des fibres aramides et polyesters vieillies en milieu basique a révélé que les fibres Technora T240 semblent être très bien adaptées au renforcement des sols traités compte-tenu de leur grande stabilité vis-à-vis de l'hydrolyse. La deuxième partie de ce travail est consacrée à l'étude du comportement viscoélastique et viscoplastique des fibres Twaron 1000 et Technora T200w