The Investigation of the Scale Effect on the Swelling Potentials of Expansive Soil Treated with Lignosulphonate Lime Columns

IV. International Turkic World Congress on Science and Engineering, Niğde, Türkiye, 23 - 24 Haziran 2022, cilt.1, ss.378-392

Lime diffusion into the expansive soil is a substantial parameter that

influences the success of the lime column stabilization method. However, the

diffusion velocity of lime particles into the expansive soil is very slow as the

expansive soils have low permeable properties. In this study, two different types of

lignosulphonate, which are sodium and calcium, were added to lime columns to

accelerate the diffusion velocity of lime particles into the expansive soil. The six

different diameters of treated specimens were selected ranging between 5 cm to

30 cm and these treated specimens have 37 pieces of lime columns. The diameters

of these lime columns are ranging between 3.5 mm to 21 mm with respect to the

diameter of treated specimens prepared in this study. All treated specimens with

lignosulphonate lime columns have lower swelling potentials than untreated

specimens. The specimens located between the columns were tested to determine

cation exchange capacity (CEC) and specific surface area (SSA) of treated

specimens. The values of CEC and SSA of treated specimens with lignosulphonate

lime columns decreased. Finally, the lignosulphonate lime columns stabilized the

swelling potential, CEC and SSA of untreated specimens. However, when the

distance between the columns increases, the achievement of this stabilization

method decreases.