PSI - Issue 28

Zuzana Marcalikova et al. / Procedia Structural Integrity 28 (2020) 957–963 Author name / Structural Integrity Procedia 00 (2019) 000–000

959

3

Fig. 2. Difference in behavior of fiber reinforced concrete and plain concrete according to Marcalikova et al., 2020a.

2. Fiber reinforced concrete MasterFiber 482 (BASF, 2020) steel fibres with dosages of 0, 40, 75 and 110 kg/m 3 (Marcalikova et al., 2020b) were used for the production of fibre reinforced concrete specimens. A total of 4 test series of samples were made. The basic concrete mixture was made of fine-grained concrete proofBeton Baumit© (Baumit, 2020). The common material tests included test to determine compressive strength, splitting tensile strength and bending tensile strength. In Tab. 1 there are average strength values determined on the basis of tests and particular coefficient of variation. The basic properties of fibres, the shape of fibres, the description of tests and test specimens are given in (Marcalikova et al., 2020b).

Table 1. Basic mechanical properties fiber reinforced concrete.

Coefficient of variation [%]

Coefficient of variation [%]

Splitting tensile strength [MPa]

Coefficient of variation [%]

Bending tensile strength [MPa]

Coefficient of variation [%]

Compressive strength [MPa]

Dosage [kg/m 3 ]

Density [kg/m 3 ]

40 75

2248 2273 2294

0.86 1.13 1.02

57.10 64.01 59.32

6.18 4.27 4.12

4.18 5.01 5.88

6.55

4.58 4.78 5.45

8.23 3.41 5.33

10.97

110

5.93

Based on the three-point bending test, the load displacement diagrams were evaluated, which are shown in Fig. 3 (a), and the fracture energies were determined, which are ordered in Tab. 2. Fracture energy is defined by the relation:

b (h a ) W f 0  

(1)

G



f

where W f is the fracture work, b is the width of the sample, h is the height of the sample and a 0 is the depth of the notch.