Compressive Behavior of Hybrid Steel Fiber Reinforced Ultra-High Performance Concrete

Abstract

Uniaxial compression tests for ultra-high performance hybrid steel fiber reinforced concrete (UHPC) were performed to evaluate the compressive behavior of UHPC. The UHPC for testing contains hybrid steel fibers with a predetermined ratio using a length of 19 mm and 16 mm straight typed steel fibers. Test parameter was determined as a fiber volume ratio to investigate the effect of fiber volume ratio on the strength and secant modulus of elasticity. Test results showed that the compressive strength and elastic modulus of UHPC increased with increasing the fiber volume ratio. Based on the test results, the compressive strength and modulus of elasticity equations were proposed as function of the compressive strength of unreinforced and fiber reinforced UHPC, respectively. The simplified equations for predicting the mechanical properties of the UHPC were a good agreement with the test data. The proposed equations are expected to be applied to the SFRC and UHPC with steel fibers.

Influence of steel fiber on compressive properties of ultra-high performance fiber-reinforced concrete

“…Comparisons between the evaluated compressive strengths by Eq. ( 7) and the collected test results from literature [19,[21][22][23][25][26][27][28][29][30][31][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] in Fig. 9 indicate that they are in good agreement.…”

“…A large number of test data with a compressive strength value of more than 120 MPa were collected from literature to verify its validity and accuracy. A total of 155 group data on the compressive strength of UHPFRC reinforced by steel fibers of a straight shape were obtained from literature [19,[21][22][23][25][26][27][28][29][30][31][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. The data include 65 kinds of matrix; the fiber volume fraction ranges from 0% to 6%; the fiber length varies from 6 mm to 50 mm, the fiber diameter from 0.11 mm to 0.6 mm, and the aspect ratio from 30 to 125, respectively.…”

“…In order to verify whether Eq. ( 14) had a wide range of applicability, this paper collected 320 data from 42 related documents [19,21,22,[29][30][31][32][33][34][35]43,46,.…”

“…The comparison between the estimated results of Eq. ( 14) and the sample data from 41 related literature [19,21,22,[29][30][31][32][33][34][35]43,46, are shown in Fig. 11.…”