期刊
ALEXANDRIA ENGINEERING JOURNAL
卷 59, 期 6, 页码 5155-5164出版社
ELSEVIER
DOI: 10.1016/j.aej.2020.09.045
关键词
Lining safety; Deep mine shaft construction; Concrete mortar; Gravity transportation; Segregation control; Relative velocity
资金
- National Natural Science Foundation of China [51974135, 51704094]
- National Key Research and Development Program of China [2016YFC0600802]
- China Postdoctoral Science Foundation [2020 M672226]
Concrete mortar segregation during vertical pipeline gravity transportation will form a weak part in the shaft lining, which poses a challenge for deep mine shaft safety. The specific gravity difference between aggregate and slurry will cause relative motion; the relative velocity is detrimental to the mortar workability, which plays a significant role in mortar segregation. A prediction model of the relative velocity between slurry and aggregate was proposed and verified by numerical simulation results. This approach adopts the interference coefficient to revise the aggregate collision loss. The corresponding relationship among aggregate relative velocity, mortar rheological properties and particle shape was analysed to explain the mortar segregation mechanism. Segregation can be prevented by increasing the mortar viscosity and shape coefficient and decreasing the density difference and aggregate diameter to reduce the relative velocity. This work is favourable for concrete mortar quality control for gravity transportation and shaft lining construction safety. (C) 2020 The Authors. Published by Elsevier B.V. on behalf of Faculty of Engineering, Alexandria University.
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