Resistance to Compression of Structural Concrete With Steel and Polypropylene Fibers

Abstract

The influence of steel and polypropylene fibers on the resistance to compression of concrete is evaluated. NTP 339.034 and ASTM C39 were used to test compressive strength in four groups with a total of 48 specimens distributed in a control group and three experimental groups during 14 and 28 days of curing. The compressive strength test was determined for an average compressive strength of f´cr = 294 kg/cm 2 (28.8 MPa), according to E 060 reinforced concrete standard. Group G1 presented a dosification of steel and polypropylene fibers of 10% by 25 kg/m 3 and 600 gr/m 3 , group G2 15% by 25 kg/m 3 and 600 gr/m 3 , group G3 20% by 25kg/m 3 and 600 gr/m 3 and G4 was not supplied with steel and polypropylene fibers. The specimens were subjected to compression tests at the age of 14 and 28 days, obtaining as a result that the most favorable group is the G3 group with a resistance of 322.98 kg/m 2 (31.67 MPa), exceeding the control group by 8.10%. It is evident that the presence of steel and polypropylene fibers in concrete significantly increase its resistance to compression.