Dynamic Damage Evolution of Steel Fiber Reinforced Recycled Aggregate Concrete Based on Acoustic Emission Technology
WEI Tianyu
LIU Xin
YANG Dahai
REN Yunhao
YE Yuxia
Abstract：Aiming at further exploring the sustainable application of recycled coarse aggregate in green buildings,the influences of steel fiber volume fraction(0%,0.5%,1.0%,1.5%),recycled aggregate replacement ratio(0%,30%,50%,100%)and loading rate(0.02,0.20,2.00 mm/s)on the mechanical properties and internal damage evolution of steel fiber reinforced recycled aggregate concrete(SFRAC)under dynamic tensile loads were investigated by using Brazilian disc splitting test and acoustic emission technology.The results indicate that the recycled coarse aggregate makes the dynamic splitting tensile strength of recycled concrete worse significantly.However,1.0%and 1.5%steel fiber can not only effectively improve this negative effect,but also enhance the toughness and energy absorption capacity of concrete.The maximum increase in dynamic split tensile strength of SFRAC is 17%.Furthermore,the evolution of crack pattern of SFRAC under dynamic axial tensile load is well reflected by the rise angle and average frequency,and the proportion of shear cracks increases with the loading rate raising.
Keywords：acoustic emissionBrazilian disc splitting testdamage evolutionmechanical propertysteel fiber reinforced recycled aggregate concrete
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 536-543 )