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One of the problems often found in constructing road is the deposit of expansive soil. According to data from Federal Emergency Agency (FEMA) in 1982, the lost caused by expansive soil in 1970 reached 798.1 million USD. In Java, the expansive soil problem can be found on the road to Surabaya. In five years, road damage in Lamongan Regency reached more than 73%, caused by an extreme soil shrinkage–swelling. Those soil problems can be solved by using soil stabilization techniques. Grain size improvement is one of the most widely used methods for fine-grained soil with low bearing capacity index. This research aimed to identify the physical and mechanical characteristics of clay soil by using sand as stabilization material containing: (1) Consistency limits characteristic of clay soil after being stabilized using selected sand, (2) Shear strength parameter of clay soil after being stabilised using sand, (3) Bearing parameter after stabilization using sand. This research was an experimental method. Research data were analysed using the descriptive method. Different amounts of sand were used as stabilization, namely 0%, 10%, 20%, and 30% of total weight of soil sample. There were 72 specimens utilised in the experiments. Tested parameter contained Liquid Limit, Plastic Limit, Shrinkage Limit and shear strength parameter using Direct Shear Test method. The results of the research showed that the best amount of sand as an addition was 30%; this amount contributed Liquid Limit from 75 % to 50 % and Plasticity Index from 29.51% to 20.69%. In other words, the more the sand added to clay soil, the less the LL and PL. Direct shear test result from the addition of 30% sand on clay soil from Deket Mojokerto contributed to the improvement of the inner shear angle from 59.27o to 65.23o. The soil cleeveness index decreased from 0.596 kg/cm2 to 0.431 kg/cm2. This result indicated that sand stabilization contributed to the improvement of clay soil shear parameter for bearing strength increment.

The Influence of Sand Addition on Clay Soil From Deket Kulon, Deket Subdistrict, Lamongan Viewed From The Physical and Shear Strength Characteristics Changes