Hardened Concrete Properties Compressive Strength
As shown in Table 2.3 (Choi and Yuan 2005; Hasan et al. 2011), the macro plastic fibres have no significant effects on the compressive strength, which is consistent
Fig. 2.4 Average stress-strain curves for concretes with macro plastic fibres (Hasan et al. 2011)
with what was reported by Hsie et al. (2008), Campione (2006), Fraternali et al. (2011), and de Oliveira and Castro-Gomes (2011). Ochi et al. (2007) reported that there is no significant variation in the values of compressive strength associated with varying PET fibre contents. Moreover, during the compression tests, the plain concrete failed catastrophically, while as reported by Brandt (2008) the macro plastic fibre reinforced concrete cylinders failed with many minor cracks on the surface. The plastic fibres still held the concrete together at the failure load. Figure 2.4 shows stress-strain curves of a compressive test on concrete cylinders conducted by Hasan et al. (2011). The samples with fibres showed a more ductile mode of failure and a post failure structural performance. This is attributed to ability of the fibres to distribute stresses and slow down the crack propagation process.