Influence of Curing Temperature on Shear Strength and Compressibility of Swelling Soil Stabilized with Hydrated Lime

The exposed cohesive soils to temperature can face considerable physical and mechanical characteristics changes. Therefore, understanding the environmental events influences on the soil geotechnical properties is essential, which is significant in the rainy and cold places such as in Sulaimani city, northern Iraq. This experimental study examines the temperature changes (10o C, and 50o C) impacts on the durability of stabilized cohesive soil using 0%, 5%, 10% and 15% hydrated-lime added as a replacement on the soils dry mass. Consistency, unconfined compression, and compressibility characteristics were evaluated. Under the applied circumstances, a decrease was noticed in the magnitudes of liquid limit and plasticity index, while plastic limit generally increased within hydrated-lime percent increase. The study yielded an appreciable improvement of the cohesive soil’s strength and compressibility properties with time progress, especially after the stabilization process is achieved.

Strength and compressibility characteristics of soil stabilized with plastic bag strips

This study investigates the potential application of utilizing plastic bag strips (PBS) in improving the strength and compressibility behavior of soils. A series of unconfined compressive strength (UCS) and consolidation tests were carried out for different proportions of plastic bag strip reinforced soil. The effect of the thickness (t) and aspect ratio (AR) on the UCS and compressibility characteristics of PBS reinforced soil was investigated. The thicknesses of PBS used were 15 µm, 30 µm and 45 µm which were added in varying concentrations (0.1%-0.7%) at different aspect ratios 1, 2 and 2.5. The laboratory results clearly show that PBS have a significant influence on the UCS and compressibility behavior of soil. In addition, the peak value of UCS (qu) increases with the thickness and AR of PBS. A significant improvement in qu has been found for 0.5% addition of PBS. Moreover, the swelling behavior of soil has significantly reduced with the addition of PBS.

Leaching Impact On Compressibility Of Untreated And Cement-Treated Champlain Sea Clay

The pore fluid salinity level of undisturbed Champlain Sea clay samples were reduced from 19.81 to 0.79 g/L using a leaching apparatus designed for this experimental study. Then the impact of leaching on the compressibility characteristics of the undisturbed, remoulded, and cement-treated clay samples were investigated through constant rate of strain tests. It was found that the compressibility of Champlain Sea clay was affected by the level of salinity in its pore fluid. The reduction of salinity to 0.79 g/L in this study impacted the compressibility of both remoulded and cement-treated clay but did not affect on the compressibility of undisturbed clay. A higher compressibility was recorded from remoulded leached sample compared to the remoulded unleached sample. In cement-treated samples, an improvement in the compressibility characteristics was observed from the leached samples treated with 50 kg/m3 GU cement compared to that of their corresponding treated unleached samples.

Leaching Impact On Compressibility Of Untreated And Cement-Treated Champlain Sea Clay

The pore fluid salinity level of undisturbed Champlain Sea clay samples were reduced from 19.81 to 0.79 g/L using a leaching apparatus designed for this experimental study. Then the impact of leaching on the compressibility characteristics of the undisturbed, remoulded, and cement-treated clay samples were investigated through constant rate of strain tests. It was found that the compressibility of Champlain Sea clay was affected by the level of salinity in its pore fluid. The reduction of salinity to 0.79 g/L in this study impacted the compressibility of both remoulded and cement-treated clay but did not affect on the compressibility of undisturbed clay. A higher compressibility was recorded from remoulded leached sample compared to the remoulded unleached sample. In cement-treated samples, an improvement in the compressibility characteristics was observed from the leached samples treated with 50 kg/m3 GU cement compared to that of their corresponding treated unleached samples.

Compressibility Characteristics of Peat Soil Treated with MUF-P Resin

Peat is commonly described as a soil that is possess to high rate of compressibility due to present of high organic substance derived from plant origins. Peat soil naturally associated with settlement and consolidation characterized by its high initial void ratio, organic content and water holding capacity. This paper presents the performance of peat soil treated with powdered melamine urea formaldehyde resin (MUF-P) in term of compression and consolidation behaviour under standard compressibility test. In this study, series of one-dimensional oedometer test were carried out with the load increment method from 12.5 to 400 kPa after 24 hours of each loading. Peat soils under high moisture condition were mixed with MUF-P within 3 days of stipulated periods of curing times. The results indicate that increasing the MUF-P proportion has improved the compressibility characteristics of peat soil. The result shows the values of compression index (Cc) decreased from 4.12 to 0.9, and secondary compression index (Cα) were also decreased from the range of 0.026 to 0.320 to the range of 0.080 to 0.161 with the increase of peat MUF-P proportions up to maximum 350 kg/m3.