EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF POLYACRYLONITRILE FIBER RECYCLED CONCRETE
The mechanical properties of recycled polyacrylonitrile fiber reinforced concrete are analyzed,in which,the effectiveness of recycled coarse aggregate replacement rates(0%to 50%)and fiber content(0 kg/m3 to 0.9 kg/m3)on the compressive strength and flexural strength of recycled concrete at different ages are studied.The experimental results indicate that with an increase in the replacement rate of recycled coarse aggregate,both the compressive strength and flexural strength of the concrete gradually decrease.However,the mechanical properties of the concrete are significantly improved when an appropriate amount of polyacrylonitrile fiber is added.Specifically,when the fi-ber content is 0.8 kg/m3 and the replacement rate of recycled coarse aggregate is 40%,the concrete exhibits optimal compressive and flexural strengths,demonstrating potential engineering applications.The paper provides a theoreti-cal basis for optimizing the mix proportion of recycled polyacrylonitrile fiber reinforced concrete.