Acoustic emission (AE) technique is an effective method in the nondestructive testing (NDT) field of civil engineering.
During the last two decades, Fiber reinforced polymer (FRP) has been widely used in repairing and strengthening
concrete structures. The damage state of FRP strengthened concrete structures has become an important issue during the
service period of the structure and it is a meaningful work to use AE technique as a nondestructive method to assess its
damage state. The present study reports AE monitoring results of axial compression tests carried on basalt fiber
reinforced polymer (BFRP) confined concrete columns and three-point-bending tests carried on BFRP reinforced
concrete beams. AE parameters analysis was firstly utilized to give preliminary results of the concrete fracture process of
these specimens. It was found that cumulative AE events can reflect the fracture development trend of both BFRP
confined concrete columns and BFRP strengthened concrete beams and AE events had an abrupt increase at the point of
BFRP breakage. Then the fracture process of BFRP confined concrete columns and BFRP strengthened concrete beams
was studied through RA value-average frequency analysis. The RA value-average frequency tendencies of BFRP
confined concrete were found different from that of BFRP strengthened concrete beams. The variation tendency of
concrete crack patterns during the loading process was revealed.