Published: Građevinar 76 (2024) 6
Paper type: Scientific research paper
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Influence of traditional and alternative additives on the physical and mechanical properties of clayey soil

This study considered the effects of different types of additives on the physical and mechanical characteristics of clayey soil using a chemical stabilisation technique. Under laboratory conditions, samples of the clayey soil mixture with selected additives at percentages of 3 %, 5 %, and 7 % were prepared and tested at time intervals of 3, 7, and 28 d after the treatment. For the prepared samples, the influence of each additive on the change in the uniaxial compressive strength, Atterberg limits, and pH values was analysed. Based on the obtained results, the optimal amount of each additive for the treated soil was determined. Using the optimal additive contents, an additional series of tests to investigate the changes in the modulus of compressibility and void ratio of the treated soil were performed after 3, 7, and 28 d, as well as changes in the California bearing ratio and swelling value after 7 and 28 d. The obtained results reveal that, depending on the amounts of additives in the mixture and the time interval of the test, the physical and mechanical properties of the treated clayey soil could be considerably improved.

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