Short-Duration Near-Nozzle Mixing for 3D Concrete Printing (2021-10)¶
10.1016/j.cemconres.2021.106616
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Journal Article - Cement and Concrete Research, Vol. 151
Abstract
Near-nozzle mixing (NNM) technique is a potential solution for the opposing rheological demands for buildability and pumpability during 3D concrete printing. However, NMM is only practical if short duration mixing can be achieved without losing mix quality. This study introduces a Short-duration Near-Nozzle Mixing (SDNNM) technique using a customised high shear mixer. The effect of sand characteristics on mixing energy consumption, flowability, compressive strength and microstructure were investigated. Results show that the printable concrete made by the customised mixer with 90 s mixing time achieved a relative flowability of 99% and a relative compressive strength of 134%, compared to the control (normal mixing) method. It was found that the sand packing density is the key characteristic for obtaining the optimum mix with comparable compressive strength. Three 3D printing trials using the optimum mix with 15, 30 and 90 s mixing durations were conducted to confirm the feasibility of SDNNM technique.
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BibTeX
@article{zhan_xia_sanj.2022.SDNNMf3CP,
author = "Nan Zhang and Ming Xia and Jay Gnananandan Sanjayan",
title = "Short-Duration Near-Nozzle Mixing for 3D Concrete Printing",
doi = "10.1016/j.cemconres.2021.106616",
year = "2022",
journal = "Cement and Concrete Research",
volume = "151",
}
Formatted Citation
N. Zhang, M. Xia and J. G. Sanjayan, “Short-Duration Near-Nozzle Mixing for 3D Concrete Printing”, Cement and Concrete Research, vol. 151, 2022, doi: 10.1016/j.cemconres.2021.106616.
Zhang, Nan, Ming Xia, and Jay Gnananandan Sanjayan. “Short-Duration Near-Nozzle Mixing for 3D Concrete Printing”. Cement and Concrete Research 151 (2022). https://doi.org/10.1016/j.cemconres.2021.106616.