Abstract
In this paper, a novel extrusion-based 3D printed material was obtained by preparing 3D printed recycled coarse aggregate concrete (3DPRAC) using recycled coarse aggregate (RCA), and the compressive and flexural properties were investigated at different RCA replacement ratios, ages, and construction forms. The porosity, pore volume distribution, pore geometry characteristics were analyzed by X-CT. MIP and SEM were used to analyze the pore structure of the RCA. The results showed that the compressive and flexural strengths have obvious anisotropic characteristics. With increasing replacement ratio, the compressive and flexural strengths generally decreased. Internal pores of 3DPRAC were found to exhibit the geometric characteristics of flat ellipsoidal and uniaxially oriented arrangements along the printing direction. A multiple partition-interface model was proposed to establish the connection between pore structure characteristics and force cracking, and the anisotropic mechanical property mechanism of 3DPRAC was revealed.
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