Effect of superabsorbent polymer particles on the flexural properties of engineered cementitious composites

The influence of superabsorbent polymer (SAP) particles on the mechanical properties of engineered cementitious composites (ECC) is investigated by employing the four-point bending test, compressive strength and flexural strength. Six different ECC mix proportions are applied, and the replacement levels of fly ash are 50% and 70%, and SAP contents are 0, 0.2% and 0.4% of binder materials, respectively. The results show that the deflection of ECC on Day 28 is not less than 10mm. The deflection of ECC becomes larger with the increase of the content of SAP. Especially, when the replacement level of fly ash is 70%, the deflection of ECC on 28 days is 25mm, the increase of SAP will result in decrease of the compressive strength and flexural strength of ECC on Day 28, and obvious increase of the compressive strength after Day 28. The ductility of ECC is similar to that of metal. Incorporating SAP into matrix can increase the crack number and reduce the crack width and crack distance.