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Home arrow Engineering arrow Creep Behaviour in Cracked Sections of Fibre Reinforced Concrete: Proceedings of the International RILEM Workshop FRC-CREEP 2016
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Experimental Method

To investigate the FRC time-dependent behavior, a number of 30 flexural beam tests (with dimensions of 150 x 150 x 600 mm) reinforced either with plastic fibres (PF) or steel fibres (SF) were carried out following a 4-point bending test. The test were done in two different environmental conditions (S1 and S2) during 5 months considering different precrack-widths and load levels.

Materials and Mix Design

Four series of concrete were produced, one with 5 kg/m3 of PF and another 40 kg/m3 of SF for each of the two environmental conditions (S1 and S2). The details of the concrete mix for all series are presented in Table 1.

The plastic macro-fibres (PF) used in the tests were derived from polyolefin with a continuously embossed surface texture to improve adherence and they had straight shape and a rectangular cross-section. The steel fibres (SF) were made of low carbon steel and are gathered into bundles by water-soluble glue and had a circular cross section and hooked ends. Further properties are presented in Table 2.

Table 3 shows the average compressive strength (fcm), average modulus of elasticity (Ecm), limit of proportionality (fL) and the residual flexural tensile strengths (fR1, fR2, fR3 and fR4) corresponding to CMODs of 0.05, 0.50, 1.50, 2.50 and 3.50 mm, respectively.

Table 1 Composition of the FRC mixture (in kg/m3)

Materials

Characteristics

Plastic fibres

Steel fibres

S1_PF

S2_PF

S1_SF

S2_SF

Gravel (6/15 mm) (kg/m3)

Granite

520

520

520

520

Gravel (2.5/6 mm) (kg/m3)

Granite

400

400

400

400

Sand (0/3 mm) (kg/m3)

Granite

500

500

500

510

Cement (kg/m3)

CEM I 52,5 R

400

400

400

350

Filler (kg/m3)

Marble dust

260

260

260

300

Water (kg/m3)

-

170

178

168

178

Superplasticizer (kg/m3)

Adva® flow 400

12

12

12

12

Fibres (kg/m3)

PF/SF

5 (PF)

5 (PF)

40 (SF)

40 (SF)

Table 2 Fibre characteristics (data provided by the manufacturer)

PF

SF

Length (L)

(mm)

48

50

Equivalent diameter (d)

(mm)

-

0.62

Aspect ratio (L/d)

(-)

-

83

Tensile strength (f)

(MPa)

550

1270

Modulus of elasticity (E)

(GPa)

10

210

Number of fibres per kg

(fibras)

>35,000

8100

 
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