Influence of Notch Plane Orientation on the Creep Behaviour
Figure 6 presents the influence of the notched plane orientation (regarding the flow direction of SFRSCC) on the relationship of creep coefficient versus time. These relationships were determined by averaging the response of the specimens with Fa/ Fcr = 100 %. For the wcr = 0.3 mm series, the variation of creep with time was slightly affected by the direction of the notched plane regarding the expected concrete flow. On the other hand for wcr = 0.5 mm series, this influence was more significant. In the case of the P = [0—15°[ series, the creep coefficient at the end of two months was 13 and 31 % higher than in P = [75-90°] for the wcr = 0.3 and 0.5 mm series, respectively. It is worth noting that the P = [0-15°[ specimens contain more effective fibres perpendicular to the crack plane, which were
Fig. 7 Creep coefficient versus time for specimens at different distances from casting point pulled-out under a sustain load progressively, while the P = [75-90°] specimens have a larger amount of fibres with a higher orientation angle towards the notch plane. In this case, the fibre reinforcement mechanism at the specimen’s crack surface was mainly governed by matrix spalling at the fibres’ exit points instead of fibre pulled-out. Therefore, the development of creep coefficient along time was influenced by the orientation of the crack plane within the SFRSCC panel, and this influence seems as larger as higher is the crack width.