Abstract
In this study, the flow characteristics of self-compacting structural synthetic fibre-reinforced cementitious composites were evaluated. The rheology was measured to quantify the flow characteristics with respect to the water-to-binder ratio (W/B) and volume fraction (Vf) of structural synthetic fibre. The test results indicated a 13–16% reduction in yield stress as the W/B increased, and an increase of 27–320% with fibre addition; however, the growth rate decreased as the fibre Vf increased. Plastic viscosity decreased by 0–69% as W/B increased, and increased by 14–412% with fibre addition, similar to the yield stress; however, the growth rate decreased as Vf increased. Overall, the change in rheology due to the addition of fibre was significant compared to that associated with changing the W/B. Analysis of the flowability test results showed that the rheology results were likely associated with the plasticity of the material as opposed to the yield stress. The aspect ratio had a strong influence on flowability, and the separation of the cement composite network depended on the Vf of structural synthetic fibre. The presence of structural synthetic fibre had a significant effect on plastic viscosity.
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