By The British National Society of the International Society of Soil Mechanics
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Extra resources for Grouts and drilling muds in engineering practice
Actual clay slurries or pastes do not follow this idealized law exactly but have flow curves of the form given in Figure ](c). When the shear stress, r , reaches a certain value, r shear failure occurs near the wall of the capillary and the slurry moves forward as a plug (stage II). As the pressure gradient increases, the diameter of the solid plug becomes progressively smaller (stage III) until the whole of the material in the capillary flows in a streamline manner like a viscous liquid, and the rate of flow then increases linearly with the From air reservoir Belt drive to motor pi R f R R l i _ Grout Stirrer Capillary Figure 2.
The surface of the bentonite crystal may thus be regarded as negatively charged. The edge of the crystal is a series of broken bonds and, according to the environment, may carry a positive, neutral or negative electrical charge. Measurements of cation-exchange capacity show that the majority of bentonites have 8 0 - 1 0 0 mE/lOOg of cations on Bentonite Clays their Bentonite is a member of the triple-layer family of clay minerals, the crystal structure of which has been extensively investigated, notably by Hofmann, Endell and Wilm, and by Edelmau and Faverjee.
London Summary This paper considers the mechanism whereby grouts can improve the mechanical properties of sand, and presents the results of preliminary laboratory studies on silicate-chloride, urea formalde hyde and polyester-treated sands. Introduction The introduction of strengthening agents into cohesionless materials has been practised by civil and petroleum engineers for several decades. The history of the whole field of in jection processes has been well treated recently (ISCHY and GLOSSOP, 1962).