摘要：In this study, the failure processes of modeled concrete specimens under shear force were studied. To investigate the cracks propagation and failure modes, modeled natural aggregate, modeled recycled aggregate, and modeled brick aggregate were used as coarse aggregate in the modeled concrete. Through digital image correlation (DIC) technology, the displacement field and strain field could be obtained by analyzing the change of the speckle position on the surface of the specimens. It was found that the shear strength of the modeled natural concrete (MNC) was the highest, the modeled recycled concrete (MRC) was the second, and the modeled brick aggregate concrete (MBC) was the lowest and only half of that of MNC. The shear crack of the MNC first appeared at the interface transition zone (ITZ) and propagated, resulting in the shear failure. The shear crack of MRC first appeared in the new ITZ and then expanded to the old ITZ. The shear crack of MBC extended through the brick aggregate. The study also found that, along with the compressive stress trace range, the MNC and the MRC have four vertical compressive strain concentration zones, while the MBC has only two strain concentration zones, which should result from the fact that the elastic modulus of the brick aggregate is lower than the surrounding hardened mortar. Therefore, there are no compressive strain concentration zones near the brick aggregate.
