چكيده به لاتين
In order to create cementation between soil particles, in this research, EICP method utilizes urea hydrolysis (a process in which carbonate precipitation is catalyzed by urease enzyme found in many plants and microorganisms) to produce calcium carbonate. The tested soil is low-plasticity silty soil that has been chosen from one of the dust centers of Khuzestan in Iran. Unconfined compressive tests are employed to evaluate the effect of the EICP method on strength of soil as a way to increase resistance of soil against wind erosion. Furthermore wind tunnel, water erosion resistance, capillarity, SEM and XRD tests are utilized to control and validate results of soil treatment. The experiments were carried out using two methods namely mixed and poured methods in loose and dense soil conditions. After the calcium carbonate precipitation process was completed, in order to evaluate results, unconfined compression samples were sited under loading, and moreover trays, containing treated and untreated soil, were placed into wind tunnel test section. Then, other complementary tests has conducted to verify results. The unconfined compressive strength of the treated soil using EICP method was up to 3760 kPa. Also, the amount of soil loss for treated specimens was close to zero, while, for untreated and water-treated specimens, the soil loss was about 500 and 100 g, respectively. The results of these experiments show that EICP can dramatically reduce the rate of grain separation compared to untreated or water-treated soils, and thus can be used as a method to encounter dust emissions.
