The effect of incorporation of steel, carbon and polyvinyl alcohol (PVA) microfibers as single and hybrid to the mechanical properties of cementitious mortars

In this study, steel, carbon and polyvinyl alcohol (PVA) microfiber are added to the cementitious composite as single or hybrid and the effects of this addition to the mechanical properties of cementitios composite are researched. In the scope of this study, steel, carbon and polyvinyl alcohol (PVA) microfiber are added at specific ratios of used aggregate volume as single or hybrid and totally 27 mortar mix are prepared. Creep, flexure and compression after flexure experiments are applied on these mixtures. From the experiment datas, creep diameter for fresh state and flexural strength, compressive strength after flexure, toughness and fracture energy properties for hardened state are determined. The effect of incorporation of steel, carbon and polyvinyl alcohol microfibers to the mechanical properties of cementitious mortars are comparatively analysed from the results of experiments. With using the fiber?s l/d ratios and fiber volumes, fiber factors are estimated and the change of mechanical properties due to the fiber factors are examined. By cost analysis, the mixtures which has the best mechanical properties with the minimal cost are determined. Keywords: Steel microfiber, carbon microfiber, PVA microfiber