Properties of Synthetic Fiber Reinforced Self-compacting Concrete

Samoslijegajući, odnosno samozbijajući beton s dodatkom vlakana relativno je nova vrsta betona. Pod pojmom samozbijajući beton podrazumijeva se ugrađivanje i zbijanje pod vlastitom težinom bez dodatnih vibracija, osiguravajući pritom potpuno ispunjenje oplata/kalupa. Da bi beton bio samozbijajući, svježa smjesa u isto vrijeme mora imati svojstva visoke fluidnosti i dobre kohezivnosti. Sintetička vlakna poboljšavanju trajnosna, a ponekad i mehanička svojstva betona te zamjenjuju klasičnu armaturu u potpunosti ili djelomično. Na taj način vlakna pozitivno utječu i na tlačna opterećenja poboljšavajući čvrstoću na tlak, a poseban utjecaj imaju na savojnu čvrstoću betona pri čemu beton postaje otporniji na vlačna opterećenja, a lom više nije krti nego duktilan. U ovom radu provedeno je eksperimentalno ispitivanje čvrstoće na tlak i savijanje uzoraka samozbijajućeg betona bez i sa sintetičkim vlaknima. Na temelju rezultata ispitivanja zaključeno je kako prisustvo vlakana nije značajno utjecalo na poboljšanje svojstava samozbijajućeg betona.Self-compacting concrete with the addition of fibers is a relatively new type of concrete. The term self-compacting concrete means installation and compaction under its own weight without additional vibration, ensuring complete filling of the mold. For concrete to be self-compacting, the fresh mix must have high fluidity and good cohesive properties at the same time. Synthetic fibers improve durability properties, and sometimes the mechanical properties of concrete replacing the ordinary reinforcement entirely or partially. In this way, the fibers positively effect on compressive loads improving the compressive strength. Additionally, the fibers have a special effect on the flexural strength of concrete, where the concrete becomes more resistant to tensile load, and fracture is no longer brittle but ductile. In this work, experimental investigation of compressive and flexural strength on concrete samples without and with addition of microsynthetic and macrosynthetic fibers was conducted. Based on the test results, it was concluded that the presence of fibers did not significantly affect the improvement of the mechanical properties of self-compacting concrete