| Waste wind turbine blades were mechanically recycled, and glass fibers of different lengths (5mm, 10mm, 15mm) were obtained after cutting, crushing and screening, which were mixed into the concrete at different volumetric admixtures (0.2%, 0.4%, 0.6%), and the recycled glass fiber concrete specimens were prepared. The mechanical properties of glass fiber concrete were tested after 28 days of curing, and combined with scanning electron microscope (SEM) to analyze the characteristics of microstructure changes of concrete mixed with recycled glass fibers, and the effects of the two factors of glass fiber length and admixture on the mechanical properties of the concrete were analyzed visually through the 3D surface diagram. The results showed that the compressive strength was optimal when 0.2% of 5 mm glass fibers were incorporated into the concrete, but the compressive strength showed a decreasing trend with the further increase of glass fiber length and admixture. Concrete splitting tensile strength and flexural strength increased with the increase in glass fiber length and admixture. Split tensile strength and flexural strength reached the optimum when 0.6% of glass fibers of 15 mm length were incorporated, which increased the split tensile strength and flexural strength by 8.6% and 11.1%, respectively, as compared to concrete without glass fibers. |
