Abstract
In order to study the resistance characteristics of wet shotcrete pipeline transportation, a small pipe type rheology and resistance test device was developed. The device is used for straight pipe resistance test, pump stop test and dyed concrete test were carried out on concrete with different characteristics. The fluidity changes of concrete with different characteristics were obtained through experiments. The results show that the slump, pressure bleeding rate, water-cement ratio were all negatively related to pipeline transportation resistance. The influence of the three factors on resistance was in order: pressure bleeding rate, water-cement ratio, slump. The dyed concrete test confirmed the principle of the plunger flow in the pipeline when concrete is pumped. The thickness of the lubricating layer increased with the increase of the water-cement ratio. The concrete pipeline transportation resistance increased with the increase of the standing time. The fitting curve was obtained through the correlation analysis between resistance and lubricating layer thickness, and the two were negatively correlated. This provides a new research idea for the study of drag reduction measures for concrete pipeline transportation.
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Acknowledgments
This study was funded by projects such as National Natural Science Foundation of China (Grant No. 51974177, 52104206); Natural Science Foundation of Shandong (Grant No. ZR2019QEE007); Special funds for Taishan scholar project; Major scientific and technological innovation projects of Shandong Province (Grant No. 2019SDZY0203): Qingdao postdoctoral Foundation.
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Chen, L., Sun, J., Guo, X. et al. Investigating the Characteristics of Wet Shotcrete Pipeline Transportation. KSCE J Civ Eng 26, 5120–5131 (2022). https://doi.org/10.1007/s12205-022-1082-5
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DOI: https://doi.org/10.1007/s12205-022-1082-5