Effect of Carbonated Recycled Coarse Aggregates on the Mechanical Properties of 3D Printed Recycled Concrete (2023-11)¶
Tong Jiaqi, Ding Yahong, Lv Xiuwen, Ning Wei
Journal Article - Journal of Building Engineering, No. 107959
Abstract
A modification method of carbonation combined with presoaking in nano-SiO2 solution was employed to enhance the recycled coarse aggregates (RCA). The water absorption, apparent density and crushing index of RCA before and after carbonation were tested. The anisotropic mechanical properties including compressive strength, flexural strength and splitting tensile strength of 3D printed recycled aggregate concrete (3DPRAC) with different RCA replacement rates were further investigated. Microscopic tests including X-ray diffraction and scanning electron microscopy were utilized to analyze the changes in phase composition and microstructure of RCA, while X-ray computed tomography was utilized to explore the evolution of pore defects of 3DPRAC. The results demonstrated the method of carbonation combined with presoaking in nano-SiO2 solution significantly improved the physical characteristics and densified the microstructure of RCA. With an increase in RCA replacement rate, there was a decrease in the mechanical properties in all directions. At the RCA replacement rate of 100%, the compressive strength, flexural strength and splitting tensile strength increased by a maximum of 24.71% in the X direction, 12.95% in the Y direction and 18.27% in the Z direction after RCA carbonation, respectively. The pore defects of 3DPRAC were effectively optimized by the inclusion of carbonated RCA. The modification mechanism was explained from the perspectives of RCA performance strengthening and pore defects evolution.
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BibTeX
@article{tong_ding_lv_ning.2023.EoCRCAotMPo3PRC,
author = "Jiaqi Tong and Yahong Ding and Xiuwen Lv and Wei Ning",
title = "Effect of Carbonated Recycled Coarse Aggregates on the Mechanical Properties of 3D Printed Recycled Concrete",
doi = "10.1016/j.jobe.2023.107959",
year = "2023",
journal = "Journal of Building Engineering",
pages = "107959",
}
Formatted Citation
J. Tong, Y. Ding, X. Lv and W. Ning, “Effect of Carbonated Recycled Coarse Aggregates on the Mechanical Properties of 3D Printed Recycled Concrete”, Journal of Building Engineering, p. 107959, 2023, doi: 10.1016/j.jobe.2023.107959.
Tong, Jiaqi, Yahong Ding, Xiuwen Lv, and Wei Ning. “Effect of Carbonated Recycled Coarse Aggregates on the Mechanical Properties of 3D Printed Recycled Concrete”. Journal of Building Engineering, 2023, 107959. https://doi.org/10.1016/j.jobe.2023.107959.