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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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Energy Absorption Capacity Before and After Creep Test

The energy absorption capacity of nine specimens of each RSC was measured following the NF EN 14488-5: 3 specimens were tested 7 days after spraying, 3 others after 28 days, the last 3 were the slabs submitted to the creep tests (1 year of loading, 1 week unloaded).

BF06 fibres were not part of this comparison because they are specific fibres which are not primarily designed to provide ductility but to avoid first micro-cracks, strengthen structures and resist in aggressive ambient conditions.

The 3 main results from Table 5 are: (1) Even slabs with low pre-cracking duration and high creep deflection still had a good energy absorption capacity, which means that they still ensured the ductility of the material; (2) All RSC, except BF01, improved their energy absorption capacity, slightly or notably. (3) RSC

Table 5 Energy absorption capacity (J)

RSC

E 7d

E 28d

E post creep

Delta 7-28 d (%)

Delta pre-post creep (%)

BF01

859

877

750

2

-13

BF02

668

801

819

20

22

BF03

906

958

942

6

4

BF04

799

1045

838

31

5

BF05a

702

836

715

19

2

WWM

1029

1042

1478

1

44

aThis is a prototype fibre, not on the market

BF02 and WWM showed the highest improvement of their E-values, these two reinforcements had the highest tensile strength (see Table 2), which confirms that higher reinforcement characteristics are required to improve ductility as the concrete matrix hardens.

The shapes of the curves are very different before and after creep (see Fig. 4a, b) as the slabs were already cracked in the second case. For example, BF05 does not

Fig. 4 a Strength-deflection curves of BF05 specimens before creep test. b Strength-deflection curves of BF05 specimens after creep test

show erratic pic values but a nearly perfect plastic behaviour. Note that specimen B of this FRSC had a deflection exceeding 20 mm, stopped when the loading plate came in contact with the loading screw.

 
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