Research on the Mechanical Properties of C50 Concrete under the Optimization of Vibration Mixing Process
In order to explore the impact of vibration mixing(VM)and conventional mixing(CM)on the mechanical properties of standard C50 concrete under impact loading,dynamic uniaxial compression tests are conducted on C50 concrete specimens prepared using different mixing methods(VM110 s,120 s,130 s,and CM180 s)utilizing the split Hopkinson pressure bar test apparatus(SHPB).The influence of vibration mixing duration on the average strain rate,peak stress,impact toughness,and energy dissipation of the specimens is examined.The findings indicate that the static compressive characteristics of concrete subjected to vibration mixing for 110 s,120 s,and 130 s are respectively 7.2％,22％,and 3.5％higher than those of conventionally mixed concrete for 180 s.The greatest enhancement is observed with a vibration mixing duration of 120 s,highlighting the significant impact of mixing method and duration on concrete strength.Under identical strain rates,the dynamic impact resistance of concrete subjected to vibration mixing surpasses that of conventionally mixed concrete,with notably higher peak stress values.The mixing method and duration exert discernible influences on this outcome,with the dynamic compression strain rate effect most pronounced at VM120 s.At comparable strain rates,the impact toughness of VM110 s,120 s,and 130 s exceeds that of CM180,with minimal variation attributable to different vibration mixing duration.Vibration mixing substantially enhances the material's impact resistance.SEM imaging reveals distinct micro-structural characteristics of the damaged concrete following vibration mixing and conventional mixing.Notably,concrete subjected to vibration mixing exhibits enhanced hydration levels and improved interfacial strength compared to conventionally mixed concrete.
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