Abstract
This research primarily aims to investigate the effect of polyvinyl alcohol (PVA) and polypropylene (PP) fibres at different volume fractions of 0.25, 0.5, 0.75 and 1% on mechanical properties of high-performance printing concrete. For concrete without fibres, there is no noticeable discrepancy in the compressive strengths between printed and cast specimens, which are around 90 MPa. In terms of bending resistance, the flexural strength in direction Z (perpendicular to printing direction) is 46% and 15% higher than that in direction X (parallel to printing direction) and that of cast specimen, respectively. For fibre-reinforced concrete, PVA and PP fibres at different contents lead to no positive impact on both compressive and flexural strengths although specimens with PP fibres show less brittle failure in these tests. Based on the experimental investigation, reinforcing printed concrete with PVA and PP fibres with the length of 6 mm might not be recommended. X-ray micro-computed tomography (Micro-CT) measurement is performed for visualization of porosity.
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