Effect of Carbon Nanotubes on the Rheological and Mechanical Properties of 3D Printed Concrete
ZHAO Yu1, WU Xikai1, ZHU Lingli2,*, YANG Zhang2, YANG Ruofan2, GUAN Xuemao2
1 School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China 2 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China
Abstract: Carbon nanotubes(MWCNTs)are nanomaterials with excellent performance. Carbon nanotubes have a significant influence on the formation and propagation of microcracks in the matrix of 3D printed concrete ( 3DPC ) and the macroscopic mechanical properties of 3D printed concrete. In addition, carbon nanotubes affect the rheological properties of fresh 3D printed concrete. The effect of the carbon nanotubes content on the rheological and mechanical properties of the 3D printed concrete was studied by setting 6 types of carbon nanotube content (0%, 0.01%, 0.02%, 0.05%, 0.08%, 0.1%). According to the SEM test results, a microscopic analysis was carried out. The results show that with the increase of carbon nanotube content, the fluidity of 3D printed concrete gradually decreases, and the static yield stress and dynamic yield stress gradually increase. The flexural strength of 3D printed concrete rises as the increase of carbon nanotube content. The compressive strength first increases and then decreases with the increase of carbon nanotube content. When the carbon nanotube content is 0.05%, the compressive strength of the printed specimen is the largest. Carbon nanotubes can play a role of bridging and filling, and be closely connected with the matrix to prevent the formation and expansion of micro-cracks and holes. The microstructure of 3D printed concrete could be significantly improved at a lower carbon nanotube content (no more than 0.05%).
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2023, Vol. 37 
