Multi-scale analysis of the mechanical properties of recycled industrial fibre reinforced self-compacting concrete
To investigate the effect of different dosing levels and diameters of recycled industrial fibres on the compressive properties and splitting tensile strength of self-compacting concrete(SCC).In this paper,recycled industrial fibres with diameters of 1.5 mm and 0.22 mm are investigated at different doping levels and their macroscopic mechanical properties are studied under 28d curing age,while their microstructure is studied and analysed by scanning electron microscopy(SEM)at the microscopic level.The results show that the recycled industrial fibres can be well combined with SCC and exert good mechanical properties.The axial compressive strength and splitting tensile strength of green fibre self-compacting concrete tends to increase as the amount of green fibre is increased.The best compressive properties of green fibre self-compacting concrete are achieved when the volume fraction of green fibre reaches 1.5％,falling back at greater than 1.5％.In addition,the 0.22 mm green fibre is able to combine better with the self-compacting concrete to give better mechanical properties than the 1.5 mm green fibre.
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