Freeze–thaw (F-T) cycles are one of the most important factors affecting the performance of silty soils with high kaolin content in seasonally freezing regions. This study investigates the improvement of a high-plasticity clayey silt soil (MH) with microencapsulated phase change material (mPCM) to prevent changes in mechanical properties when subjected to freeze–thaw cycles. Unconfined compression, one-dimensional compression, and freeze and thaw tests were performed to evaluate the behavior of treated soil under different freeze/thaw cycles and with different mPCM ratios. It has been observed that the mPCM additive decreased the unconfined compression strength (UCS); however, the strength of the soil held constant during the increasing F-T cycles, and the increase in the mPCM additive content increased the strength of the soil. The inclusion of mPCM affected the compression of the soil and increased settlement (∆H), although the settlement remained constant with increasing freeze–thaw cycles. It has been noted that the compression behavior, which is least affected by the unconfined compressive strength and freeze/thaw cycles, is achieved with the addition of 10% mPCM. As a result of the tests, it was determined that the most suitable additive mPCM ratio is 10% for the compression and strength behaviors.
At the same time, this study is focused on the inconsistency of the real data obtained directly from the laboratory experiments and the low accuracy rate that occurs in the general regression studies due to the fact that these data do not follow a certain trend. It is also examined how these accuracy rates can be increased by the Random Forest regression method. Consequently, it is shown that the Random Forest regression method can be used for the estimation of the consistency and compaction properties of highly plastic clayey soils, and gives satisfactory results to use.
With increase water content and vertical stress, swelling tendency decreases, sitting increases, secondary consolidation index increases With compaction energy increases, soil compacted increase. Secondary consolidation behavior wasn't appearedWhen high plasticity clays are used in high fill construction, they can be subjected to high stresses. In this study, a high plasticity clay soil was used as fill material. When this soil is exposed to water under different stresses during its service life, volume changes are expected to occur. This volume change behaviour was investigated using a series of consolidation tests. Figure A. Variation of vertical effective stress with v (a) and swelling -compression values (b)Purpose: This study focuses volume change of the high plasticity clay is used as filling material.
Theory and Methods:In this study, three serial consolidation tests were made for volume change behaviour. For this, laboratory devices (modified proctor and consolidation) were utilized. The samples were prepared on the optimum water content determined with the modified compaciton method and on the wet side of this value at the relative compaction (R.K.) rates of 90% and 95% for one dimentional consolidation tests. In first serial consolidation tests, soil, were loaded under high stresses at the compressed water content value with water (S) and without water (N). In second serial consolidation tests (S50, S100, S200 ve S800), the water were added to soil at 50, 100, 200 and 800 kPa, respectively. In third serial consolidation tests (K), creep behaviour were investigated.
Results:With tests performed, compressibility index, unloading index and secondary consolidation index were calculated.
Conclusion:At the end of the tests conducted was appeared that with increase water content and vertical stress, swelling tendency decreases, sitting increases. Creep behaviour was not appeared any samples.
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