Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Permeability characteristic and microstructure analysis of bentonite cement composite sand
Seepage, a common problem in underground projects, seriously affects the safety and durability of underground structures. Grouting is a common means to achieve seepage prevention and plugging in underground spaces, and bentonite cement-based grout is a kind of grouting material with good performance. In this paper, with variable head permeability tests, the permeability characteristic of bentonite cement composite sand is analyzed, which shows that the bentonite cement-based grout can reduce the permeability coefficient of sand to a large extent and the plugging effect of micro fine cement is better than that of ordinary cement under the same conditions. The microstructure is analyzed by scanning electron microscope tests. The test results show that the CSH gel produced by cement hydration can link with bentonite to form a dense microstructure, which is attached to the surface of sand grains and fills the pores between sand grains, thus reducing the permeability of the sand and achieving seepage prevention and plugging.
Permeability characteristic and microstructure analysis of bentonite cement composite sand
Seepage, a common problem in underground projects, seriously affects the safety and durability of underground structures. Grouting is a common means to achieve seepage prevention and plugging in underground spaces, and bentonite cement-based grout is a kind of grouting material with good performance. In this paper, with variable head permeability tests, the permeability characteristic of bentonite cement composite sand is analyzed, which shows that the bentonite cement-based grout can reduce the permeability coefficient of sand to a large extent and the plugging effect of micro fine cement is better than that of ordinary cement under the same conditions. The microstructure is analyzed by scanning electron microscope tests. The test results show that the CSH gel produced by cement hydration can link with bentonite to form a dense microstructure, which is attached to the surface of sand grains and fills the pores between sand grains, thus reducing the permeability of the sand and achieving seepage prevention and plugging.
Permeability characteristic and microstructure analysis of bentonite cement composite sand
Dai, Zili (Autor:in) / Tan, Binbin (Autor:in) / Wang, Lin (Autor:in) / Qin, Shiwei (Autor:in)
06.11.2021
1648641 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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