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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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Test Specimens

Both FRC and RC specimens were cast in 150 x 150 x 600 mm size moulds, cured and prepared by following the recommendations of the EN 14651:2007 standard [11] for flexural tests.

Compaction was carried out by external vibration in order to avoid any differential effect on the fibre orientation along the control section among the tested concretes.

Prior to the test, specimens were rotated over 90° around their longitudinal axis and then notched by sawing through the width of the test specimen at mid span. The notch depth was 25 mm.

All concretes were characterised in terms of compression and their flexural residual strength.

Creep Test Variables

The experimental campaign included a total of 37 SFRC and 6 RC specimens which were successfully tested according the flexural creep test methodology detailed in the next section. Table 4 shows the tested combinations.

In addition to the variables of mix design of concrete, there are two significant variables related to the creep test: the nominal pre-crack opening level (CMODpn) and the stress level (Ic) sustained during creep test. In this work, the CMODpn takes values of 0.5 and 1.5 mm which represent the first and second level where the corresponding flexural residual strength (fR1 and fR2) are calculated following the EN 14651:2007 standard [11]. Stress levels or Ic values were defined aiming at testing the concretes from a service load level (60 % offR,p) to a relatively high load level (80 % offRp) and at an exceptional load level (95 % offR,p).

Table 4 Creep test program

Designation

Nominal stress level (In, %)

Pre-crack (CMODpn, mm)

Tested specimens

I 80/35-40-10

60, 80

0.5

6

80

1.5

3

I 80/35-70-10

60, 80, 95

0.5

9

I 80/50-40-10

80

0.5

2

I 208-10

80

0.5

3

II 80/50-40-20

80

0.5

3

II 65/40-40-20

60

0.5

3

II 45/50-40-20

80

0.5

6

II 50/30-40-10

60, 80

0.5

5

II 206-20

80

0.5

3

 
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