The effect of fibers on the mechanical properties of ultra high performance concrete

Ultrahigh-performance concrete (UHPC) represents an innovative category of concrete that sets itselfapart from traditional concrete through distinct material characteristics. It is crucial to comprehend andcontrol the time-dependent attributes of such materials to ensure their proper application in variousconstruction projects. In this research, an experimental study has been conducted on the compressiveproperties of ultrahigh-performance concrete with polypropylene, steel and glass fibers. In order to carryout this research, using the ACI-۲۱۱ regulations, suitable for UHPC, the concrete mixing design using threetypes of limestone, andesite and quartzite aggregates, as well as ۵% of fiber materials (۰, ۵, ۱۰, ۱۵, ۲۰%)cementitious materials) and three ratios of water to cementitious materials (۰.۴, ۰.۳ and ۰.۲۴) were prepared.The results obtained from the compressive strength test revealed that the changes in the compressivestrength of the samples increase with the addition of fibers. By adding fibers, the change coefficient ofcompressive strength increased from ۴.۹۶% to ۸.۴۲%.

Keywords:

Experimental study , Fiber , Polypropylene , Steel , Glass , Mechanical properties , Compressive strength.