Mechanical properties of fiber reinforced concrete mixed with recycled fine aggregate: compressive, flexural, and tensile behavior

Abstract

Abstract Recycled fine aggregates (RFA), as a recyclable and reusable material, can help reduce the exploitation of natural resources and promote resource recycling. To deeply study the influence of the incorporation rate of RFA on the mechanical properties of fiber-reinforced concrete (FC), this paper conducts experiments to investigate the properties of FC with an incorporation rate ranging from 0 to 30% under compression, flexural and tensile conditions. The results show that in the compression test, the addition of RFA will lead to the reduction of the compressive strength of FC. When the incorporation rate of RFA reaches 30%, the compressive strength is reduced by 31%. In the bending test, when the incorporation rate was 5%, the initial cracking displacement decreased by 22.59%. The incorporation of RFA will cause the post-peak strength of FC to decrease at 5% and then increase. In the tensile test, compared with RFA-5, as the incorporation rate increased from 0 to 30%, the ultimate stress decreased by 43.98% and the post-peak stress was reduced by 26%. The incorporation of RFA will inhibit the strength loss of FC after cracking.

Keywords

• Recycled fine aggregate
• Fiber-reinforced concrete
• Fiber bridging
• Mechanical performance