The researchers studied how adding cement to clay soils can improve their properties. They compared cement and lime mixtures on 11 different soil samples. Adding 3 or 5 percent cement reduced soil plasticity and increased strength. Cement-treated soils had higher strength than lime-treated ones, especially for A-6 soils. A-6 soils treated with cement were stronger than A-7-6 soils. Overall, cement treatment improved soil properties more than lime treatment.