Behaviors of semi-precast beam made of recycled aggregate concrete

Abstract

SUMMARY This paper presents behaviors of semi‐precast beams made of recycled aggregate concrete (RAC) including flexural and shear performance. Specially, cracking patterns, deflections and bearing capacities of U‐typed and C‐typed beams are intensively examined, analyzed and discussed. In the study of flexural behavior, a main parameter is reinforcement ratio, whereas the shear span‐to‐depth ratio and types of precast section are parameters in the investigation of shear behavior. First, the flexural tests show that the bearing capacity and stiffness of RAC beams are increased with the increase of reinforcement ratio, whereas the ductility is decreased with the reinforcement ratio; the plane section assumption that applies to semi‐precast beam with RAC is possible. Second, the shear tests show that the shear capacity of RAC semi‐precast beam increases with the decrease of the shear span‐to‐depth ratio. The types of semi‐precast section have no significant influence on performances of semi‐precast beam. However, the testing phenomenon of the interface between the precast and cast‐in situ parts is presented in this study and needs further study. Finally, both flexural and shear test results reveal that the formulas in the current Chinese technical code for RAC are feasible for design. Copyright © 2013 John Wiley & Sons, Ltd.

A review of experimental results on structural performance of reinforced recycled aggregate concrete beams and columns

“…The RCA replacement ratio, the water-to-cement ratio, and r L,min of the different tests are reported within the caption of the figure. Generally, an increase in r L improves the bending moment capacity of RNAC beams and the same is true for RRAC beams regardless of r (Appa Rao et al, 2008;Ashour, 2000;Xiao et al, 2014bXiao et al, , 2016. The influence of r L on the cracking moment ratio is relatively low while it is marked for the yield moment (with an almost linear dependency) and the ultimate moment (with a nonlinear dependency).…”

Experimental evaluation of the effort of dune sand replacement levels on flexural behaviour of reinforced beam

“…The axial compressive strength is the most important factor for the structural calculation and design (Xiao et al 2014). The measured prisms' axial compressive strength of all the concrete specimens are shown in Table 6.…”

“…The x is one of the parameters of concrete, and it varies with the load. To simplify the calculation, the M C u could be expressed as in the following equation (Xiao et al 2014):…”

A database on flexural and shear strength of reinforced recycled aggregate concrete beams and comparison to Eurocode 2 predictions

“…Besides investigations of short-term flexural and shear performance of reinforced RAC beams, which is studied in this paper, there has been significant research on various other topics such as semi-precast RAC elements [13], shaking-table and pushover analyses of complete RAC frame structures [14,15] and long-term behavior of RAC beams [16]. Important literature also exists on the ecological and economic viability of RCA production and use [17][18][19].…”