Intensification of concrete spraying for buried structures, including composition selection
https://doi.org/10.21285/2227-2917-2021-2-242-249
Abstract
The study aims to substantiate the application of concrete spraying technologies, which allow the soil and mines during the mining operation to be strengthened and underground spaces to be repurposed for further use (e.g., sports facilities and cultural heritage sites, as implemented in some European countries). The advantages and disadvantages of concrete spraying technologies are considered. Following the need for sprayed concrete to meet high operational requirements, the authors offer sprayed concrete compositions with increased physical and mechanical properties. The properties of the mixtures are optimised by adding microfillers with hydraulic activity. In experimental work, concrete strength development of sprayed concrete samples with setting agents of various origins (A1 and A2 aluminates based and B1 and B2 nonalkaline accelerators) was investigated. It was determined that nonalkaline setting agents are more efficient than those based on aluminates. This can be explained by the higher activity of these setting accelerators in the structure formation of cement brick and the formation of new growth that promote cement hydration in large volumes. The high-efficiency cooperation of setting agents and microfiller allows the composition of sprayed concrete to be selected, taking into account any rock pressure values for medium-stable soil and medium section mine roadway.
About the Authors
S. I. Bazhenova
Moscow State University of Civil Engineering (National Research University)
Russian Federation
Russian Federation
Sof'ya I. Bazhenova, Cand. Sci. (Eng.), Associate Professor of the Department of Technologies of Binders and Concretes
26 Yaroslavskoye Shosse, Moscow, 129337
A. A. Melnicnenko
Moscow State University of Civil Engineering (National Research University)
Russian Federation
Russian Federation
Alexandra A. Melnichenko, Undergraduate student
26 Yaroslavskoye Shosse, Moscow, 129337
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Review
For citations:
Bazhenova S.I., Melnicnenko A.A. Intensification of concrete spraying for buried structures, including composition selection. Izvestiya vuzov. Investitsii. Stroitelstvo. Nedvizhimost. 2021;11(2):242-249. (In Russ.) https://doi.org/10.21285/2227-2917-2021-2-242-249
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