The interface and bond between concrete and reinforcing steel are the most fundamental problems of reinforced\r\nconcrete structures. In this paper, the pull-out strength of galvanized steel strips with different geometries and hole\r\npatterns in foam concrete blocks are investigated experimentally and numerically. Foam concrete mixtures of 1,200-\r\nkg/m3 density were obtained by mixing cement and water in a mortar mixer together with ultrafoam as the\r\nfoaming agent and Quick-Gel as the viscosifier. A theoretical model is developed to predict the bond-slip\r\nrelationship between the strip and the concrete. This model is further implemented in a finite element simulation\r\nof the pull-out tests through the ABAQUS user subroutine. The results show good correlation between\r\nexperimental, theoretical, and finite element simulation analyses. The influence of the steel strip geometries on the\r\nmaximum pull-out force is also studied, and it was found that the strips with the greatest hole area, hole diameter,\r\nand circumference areas have higher pull-out forces and the increase is nearly linear.
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