Abstract
Due to the insufficient understanding of the mechanism for soil strengthening by using Ionic Soil Stabilizer (ISS), the application of ISS in soil treatment is limited. In this paper, red clay samples were treated by using ISS and the effects were examined by the Atterberg test and uniaxial pressure test. In order to understand the mechanism, ISS dilution-based seepage test and ξ-potential test have been carried out. The results show that the ISS-Water mixture of 1 : 200 was the most effective ratio to reduce the plasticity index. The measurements indicate the thickness of the pair-electricity layer of adjacent clay layers and the repulsion force among soil particles is reduced, which in turn enhances the attraction force of the clay layers. This process strengthens the connection among the soil particles and thus increases the strength of the soil as detected by the experimental tests.
Highlights
Most of the previous studies have been carried out on the reinforcement of soil using the Ionic Soil Stabilizer (ISS), but they rarely consider the optimization of the mixture ratio and the physicchemical mechanisms. us, the mechanism of ISS-reinforced soil was insufficiently understood. is paper implements a series of physical mechanics and electrochemistry experiments to optimize the mixture ratio of ISS dilution and to understand the mechanism of clay reinforcement by seepage tests
Most of the previous studies have been carried out on the reinforcement of soil using the ISS, but they rarely consider the optimization of the mixture ratio and the physicchemical mechanisms. us, the mechanism of ISS-reinforced soil was insufficiently understood. is paper implements a series of physical mechanics and electrochemistry experiments to optimize the mixture ratio of ISS dilution and to understand the mechanism of clay reinforcement by seepage tests
Physical Property of the Samples. e samples were collected from Wuhan City of Hubei province, which is located in the middle of China. e soils show reticular characteristics, red and white color, with burying depth that varies from 1 m to 3 m. e soil samples were prepared to match the natural properties such as water content [30], plastic limit, and liquid limit of the red clay
Summary
42.92 immediately placed in a standard conservation box (with humidity of 95%, temperature of 20 ± 2°C, for 7 days, 14 days, 28 days, and 60 days). In order to understand the reaction mechanism, the ion components of anion and cation in leaching solution is analyzed at different seepage periods. The ion exchange between ISS dilution and red clay and the migration laws of cations such as K+, Na+, Ca2+, and Mg2+ in solution varied with time were examined. Before the ISS dilution seepages through the red clay sample, the soil sample had been filtered by pure water for 6 days. E conductivity of the leaching solution was measured less than 15 uS/cm, which is similar to pure water. It indicates that the soluble salt in the red clay is substantially dissolved. Is sample of leaching solution can reflect the state of the initial reaction between ISS and the soil. Energy Spectroscopy Test. e chemical composition of red clay before and after the treatment by ISS was analyzed by environmental scanning electron microscope equipped with energy dispersive spectrometer (EDS) (type: Quanta 200FEG, FEI company, Netherlands)
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