Experimental study on the freezing resistance of fiber reinforced high strength concrete

The effects of fiber volume fraction of basalt fibers and cellulose fibers and fiber length of basalt fibers on the freezing resistance of C60 high strength concrete were studied by the quick freezing and thawing cycle test of fiber reinforced high strength concrete. The appearance damage form, relative dynamic modulus of elasticity, freezing resistance grade and freezing durability index of specimens were analyzed. The results show that, basalt fiber and cellulose fiber can improve the appearance of spalling of high strength concrete. The freezing resistance of C60 high strength concrete increases with the increase of the volume fraction of basalt fiber (18 mm length) and cellulose fiber. Within volume fraction of 0.10vol%-0.20vol%, the improvement degree of basalt fiber is much greater than that of cellulose fibers. Basalt fiber reinforced high strength concrete can be used for a longer period of time in the harsher cold environments. The fiber length of basalt fiber greatly affects the freezing resistance of C60 high strength concrete. Compared with the basalt fibers with 18 mm length, the effect of basalt fibers with 6 mm or 30 mm length on the freezing resistance of C60 high strength concrete is very limited.