Abstract
When grouting in a sand layer, the filtration of the layer on cement particles is an important aspect affecting the grout dispersion. However, few laboratory studies have been conducted to investigate the distribution of cement particles along the direction of dispersion. In this study, a group of laboratory tests were conducted by grouting in a sand layer under different levels of pressure. The distributions of cement particles in sand after curing were then measured using the EDTA titration test. The results show that, due to the filtration effect, the cement content along the radial direction of dispersion decreases nonlinearly in a reversed S shape. The filtration effect becomes more obvious when grouting with a higher grout concentration. With the decrease in grout concentration, the filtration effect becomes weak and cement particles could disperse farther in the sand layer, but the cement content in a farther location becomes lower and the improvement of the soil strength is limited. In the end, the measured results were compared with the calculated results according to an existing theoretical study and the trend reasonably matches with each other.
Highlights
Grouting is a widely used technique in geotechnical applications, including for antiseepage, leak stopping, and ground improvement
In this study, grouting tests and Ethylenediaminetetraacetic Acid (EDTA) titration tests were conducted in a laboratory to investigate the distribution of the cement content under the filtration effect during grouting
The measured results were compared with the calculated results according to a theoretical equation from an existing study
Summary
Grouting is a widely used technique in geotechnical applications, including for antiseepage, leak stopping, and ground improvement. In the process of grouting, the permeability of soil decreases gradually and the dispersion of cement grout would slow down and stop eventually. Eriksson et al [7] predicted the movement and distribution of cement particles by numerical analysis based on a network model of slurry dispersion and evaluated the improvement of ground by grouting. Maghous et al [9] developed a numerical solution for cylindrical permeation grouting in porous media based on the theoretical model proposed by Saada et al [4]. A series of grouting tests in a sand layer and the Ethylenediaminetetraacetic Acid (EDTA) titration tests using grouted sand samples were conducted to investigate the distribution of the cement particles along the direction of dispersion. The test results of this study were subsequently used to verify the effectiveness of an existing theoretical equation
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