Abstract
In order to study the mechanical properties of recycled aggregate concrete (RAC) specimens after exposure to high temperatures, 120 RAC prism specimens, 57 reinforced recycled aggregate concrete (RRAC) specimens, and 56 steel reinforced recycled aggregate concrete (SRRAC) specimens were designed, involving two varying parameters such as recycled coarse aggregate (RCA) replacement percentage and temperature. The performance degradation of RCA materials, RRAC members, and SRRAC members after exposure to high temperatures was analyzed in depth. The research results show that after exposure to high temperatures the surface color of members may change from cinereous to gray-white. Some cracks may appear on surface of members and the mass of members may be lighter. With the increase of the experiencing temperatures, the bearing capacity (compressive, bending, and shearing) of RAC and its members are reduced, but their ductility and energy dissipation capacity have little effect on the change of high temperature. With the increase of the RCA replacement percentage, the mass loss ratio, ultimate bearing capacity, and peak deformation of each RAC and its members increase slightly, and the displacement ductility and energy dissipation capacity of the RRAC members decrease slightly. With the increase in replacement percentage of RCA, mechanical properties of RAC and their members have little effect after exposure to elevated temperatures, and the fluctuation range is within 20%.
Highlights
Recycled aggregate concrete (RAC) is a green building material that can realize the recycling of construction waste, save energy, protect the environment, meet the requirements of sustainable development, and have good fiscal, environmental and social benefits [1]
Won-Chang Choi et al [12] designed and tested seventeen square columns subjected to monotonic concentric compression loads, the results indicated that compressive strength generally decreases with increasing in replacement percentage of recycled aggregate concrete (RAC)
The results showed that the RAC with replacement percentage of 10% had better mechanical properties when exposed to high temperatures
Summary
Recycled aggregate concrete (RAC) is a green building material that can realize the recycling of construction waste, save energy, protect the environment, meet the requirements of sustainable development, and have good fiscal, environmental and social benefits [1]. Xiao J Z et al [17] designed and tested four 1:2 scaled frame specimens to study seismic performance, the results indicated the general seismic behavior of a RAC frame structure was declined with an increase of the RCA replacement percentage. The results showed that RAC had better mechanical properties than ordinary concrete after exposure to high temperatures [20]. The results showed that the RAC with replacement percentage of 10% had better mechanical properties when exposed to high temperatures In those RAC, recycled fine aggregate concrete had the best mechanical properties under elevated temperature. Based on the preliminary experimental data, this paper mainly analyzes the degradation law of the mechanical properties of RAC materials, RRAC members (column, beam), and SRRAC members (column, beam) after exposure to high temperatures, and quantitatively analyzes the differences between them, so as to provide reference for further research and engineering application of RAC members
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