Experimental Study on the Compressive Strength and Void Ratio of Bentonite-Cement Grout
To investigate the suitability of bentonite-cement slurry as a borehole sealing material,cement and ben-tonite were mixed in various proportions to form slurries.Tests were conducted on the compressive strength of the slurry stone at 3 and 28 days,as well as its porosity ratio at 3 days.The study analyzed how the bentonite content and curing age affected the strength of the slurry stone,and the trends in porosity ratio and strength variations.The findings indicate that bentonite addition notably reduces the strength of the cement slurry stone.Strength de-creased with increasing bentonite content across various curing ages and mix ratio.The early strength of cement slurry mixed with bentonite is relatively slow,with more potential for growth and surplus in the later stage.When foundation strength is not critically required,bentonite-cement slurry can effectively seal boreholes,maximizing material efficiency and reducing cement usage for borehole sealing.However,caution is advised when using ben-tonite-cement slurry in embankment collapse and unstable slope sections due to its slower strength gain compared to pure cement slurry.
bentonitecement slurrycuring agecompressive strengthporosity ratio
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