Chemical Resistance of Polyvinylalcohol Reinforcing Fibers

This paper describes a research project performed on the chemical stability of polyvinylalcohol (PVA) fibers used as reinforcement in cementitious composites. PVA fibers were treated with sodium hydroxide and hydrochloric acid solutions for different periods of time, respectively. Subsequently, both the mass loss ratio and the retained strength were measured. The surface morphology of the fibers was characterized using a scanning electron microscope (SEM), and the crystal structure of the fibers was measured using X-ray diffraction (XRD). Finally, original and treated fibers were used to prepare the cementitious mortar respectively, and the effects of fibers with different treatments on the mechanical properties of composites were tested. The results indicate that chemical treatment causes small mass loss and change of surface morphology. The chemical treatment has no significant influence on the strength of PVA fibers; however, the decrease of grain size in PVA fibers has a beneficial effect on the strength. For the fibers treated by alkaline solution, the tensile strength is somewhat higher than that by acid solution under the same conditions. The chemical treatment can bring small deviations in the consistency of the strength between fibers and mortars. This may be attributed to the kinking of fibers during the chemical treatment process.

並列關鍵字

Chemical resistance ； Fiber-reinforced mortar ； Fibers

國際替代計量

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