The fibre utilization efficiency of directionally distributed fibre‐reinforced concrete is better than that of randomly distributed fibre. However, controlling the fibre direction is difficult, which limits its applications. In this paper, a method in which fibres were artificially directed was used to simulate the feasibility of orienting fibres during 3D concrete printing. Based on artificially directed steel fibre‐reinforced concrete specimens, the orientation characteristics of directional fibre‐reinforced concrete specimens were studied. The differences between the gravity and the boundary effects in ordinary fibre‐reinforced concrete and artificially directed fibre‐reinforced concrete were compared. The average orientation coefficient in randomly distributed fibre‐reinforced concrete was 0.59, whereas this value in directionally distributed fibre‐reinforced concrete was over 0.9. This result demonstrated the feasibility of manually orienting the fibres in steel fibre‐reinforced concrete in layer‐by‐layer casting.
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Li et al. (2018) studied this question.
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