Flexural behaviour of steel and macro-PP fibre reinforced concretes based on alkali-activated binders

In the following study, the mechanical properties of steel and macro-PP fibre reinforced concretes based on an alkali-activated slag (AAS), an alkali-activated fly ash (AAFA) and an Ordinary Portland Cement (OPC) were studied. The influence of different fibre materials (macro-PP fibres and steel fibres mix) and contents (0, 0.3 and 0.6 vol%) on the compressive, splitting tensile and flexural tensile strength was investigated at an age of 28 days. The obtained load-deformation curves and the characteristic post crack behaviour (according to EN 14651) were interpreted by additional analyses of the bond behaviour via micro X-ray computer tomography (lXCT) and scanning electron microscopy (SEM).