The undrained shear strength at liquid limit is approximately 2.19 kPa, but, though the undrained shear strength at plastic limit has a wide range in comparison with liquid limit (17–636 kPa), as its recommended value, 143.95 kPa was proposed by the researchers. It was found that fall cone liquid limits were 2–4% higher than obtained from the Casagrande device. Besides, optimum water content ( ω opt) values of the mixtures decreased up to around 10–20% of clay content and then increased continuously. Experimental results showed that the maximum dry density ( ρ dmax) values of the mixtures increased up to 10% clay content (threshold clay content) then decreased with increasing clay content. An intensive series of standard compaction, Casagrande, fall cone, and plastic limit ( w P) tests were performed on specimens. Two different clay types (kaolinite and bentonite) were mixed with different-sized clean sand at mixture ratios of 0 to 100% with increasing 10% by dry weight. This paper presents effects of particle size distribution and plasticity on geotechnical properties of sand-clay mixtures.
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