At the same time, the evaluation of the mixing degree of binary geotechnical mixture by the existing indexes is obviously insufficient. Whether the mixing degree index (Md), which is one of the factors that can affect the local and overall properties of granular materials, will affect the strength of binary geotechnical mixtures has become a topic of interest. Ultimately, based on the equivalent inter-granular void ratio concept, a new modified expression is suggested to predict the maximum shear modulus of dense binary packings using mono-size packings results.īinary geotechnical mixtures are usually studied as homogeneous materials however, it is difficult for coarse and fine particles to mix evenly during the formation process of binary geotechnical mixtures. However, when the fines content remained constant, the maximum shear modulus increased as the particle diameter ratio increased. Additional test results on dense binary packings showed that by increasing the fines content at a constant particle diameter ratio, a rise and fall occurs in the maximum shear modulus the maximum value occurs at threshold fines content. The experimental test results on dense mono-size packings showed that the particle diameter (from 2.21 to 6.20 mm) does not significantly affect the maximum shear modulus of mono-size packing. BLUE SPHERES RESUME SERIESFor this purpose, a series of 83 tests on dry samples were conducted by means of the Resonant Column apparatus. The present paper investigates the effect of fines content and particle diameter ratio on the maximum shear modulus of dense binary packing of spherical particles.
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