Axial Tensile Test of Wet-Screened Concrete Based on Digital Image Correlation and Acoustic Emission
To investigate the crack development behavior of wet-screened concrete under uniaxial tensile test at vari-ous loading rates(1×10-6、5×10-6、25×10-6 s-1),a combination of acoustic emission(AE)and digital image cor-relation(DIC)was utilized to monitor the wet-screened concrete specimens in real time.Displacement-load curves,acoustic emission signals and crack location under different loading rates were obtained.The findings revealed that in the axial tensile process,the cumulative energy within the specimen increased with increasing loading rate,and the damage index of the specimen developed linearly.Meanwhile,the fracture of the specimens was mostly due to the failure of the surface between coarse aggregate and cementitious material,accompanied by the destruction of coarse aggregate.The fracture location of the aggregate highly corresponded with the AE energy signal.As the load-ing rate increased,the proportion of the primary crack displacement to the axial displacement of the specimen in-creased significantly,indicating a considerable strain concentration within the specimen.
国家科技期刊平台
NSTL
万方数据
维普
