High-modulus and low-shrinkage hybrid-fiber reinforced engineered cementitious composites (ECC)

Engineering properties of sustainable engineered cementitious composites with recycled tyre polymer fibres

“…Fig. 10b compares the current results of elastic modulus with the existing equations for predicting the elastic modulus of ordinary concrete [61,62] and the results of elastic modulus acquired from other studies on ECC [63][64][65]. Similar to the trends of two predicting equations, a positive correlation can be found between elastic modulus and compressive strength for all ECC mixtures.…”

“…However, the equations for Portland cement concrete overestimated the elastic modulus of ECC, which can be primarily assigned to the elimination of coarse aggregate and the addition of flexible fibre into ECC mixtures. It was found that regardless of reinforcing fibre, the elastic modulus of ECC went up with the increase of sand-to-binder ratio [65]. Although steel fibres (210 GPa) have a higher elastic modulus than PE fibres (100 GPa), replacing 1.0% PE fibre with steel fibre reduced the elastic modulus of mono-PE fibre reinforced ECC by around 9% due to the introduction of more defects by steel fibres [65].…”

“…It was found that regardless of reinforcing fibre, the elastic modulus of ECC went up with the increase of sand-to-binder ratio [65]. Although steel fibres (210 GPa) have a higher elastic modulus than PE fibres (100 GPa), replacing 1.0% PE fibre with steel fibre reduced the elastic modulus of mono-PE fibre reinforced ECC by around 9% due to the introduction of more defects by steel fibres [65]. This supports the previous discussion that the quality of internal structure plays a more important role in the elastic behaviour of ECC.…”