Experimental Study on Strength and Dry–Wet Cycle Characteristics of South China Coastal Soft Soil Solidified by Cement Collaborating Sand Particles

To study the influence of sand particles on strength and dry–wet cycle characteristics cement-solidified South China coastal soft clay, a series clay samples with different contents sizes were prepared, unconfined compression (UCS) tests, tests under seawater freshwater conditions, scanning electron microscopy X-ray diffraction carried out. The test results show that UCS cement–sand-solidified soil (CS-SS) at 7, 14 28 d increase as particle content increases, their size decreases; average mass loss rate sand–cement ranges from 14% to 61%. properties durability improve increases decreases. Moreover, anti-dry–wet ability conditions is better than those conditions. (SEM), (XRD), ion chromatography stiffness replacement effect (the high replaces low clay), interface cementation between cemented soil, microcrack expansion-obstructing effects contribute improvement cement–sand solidified clay.