Microencapsulated phase change material (mPCM) possess an excellent heat storage capacity, which could mitigate temperature fluctuation of soil during freezing/thawing in seasonally frozen regions. Two types of mPCM were investigated using scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infra-red spectroscopy and thermal analysis. Experiments including freezing/thawing tests and unconfined compression tests were conducted to evaluate the behaviour of soil treated with different concentrations of mPCM with butyl stearate and paraffin core material (B-PCM and P-PCM, respectively) during freezing/thawing. The mPCM released and absorbed latent heat, decreasing the temperature variation rate of soil. The unconfined compression strength of silty clay with both types of mPCM displayed diverse trends after freeze-thaw cycles. In contrast to flaky agglomeration in B-PCM-treated soil, the characteristic cementated agglomeration existing in soil aggregates exclusively treated by P-PCM was visually captured using SEM, which formed by the interaction of leaked paraffin in P-PCM and soil due to compaction effort. Furthermore, B-PCM alleviated the strength deterioration of silty clay after freezing/thawing, and the core-to-shell ratio strongly affected the soil strength.

微囊化相变材料（mPCM）具有出色的储热能力，可以缓解季节性冻结区域在冻结/解冻过程中土壤的温度波动。使用扫描电子显微镜，X射线光电子能谱，傅里叶变换红外光谱和热分析研究了两种类型的mPCM。进行了包括冷冻/融化试验和无侧限压缩试验的实验，以评估在冷冻/融化期间用不同浓度的mPCM硬脂酸丁酯和石蜡芯材料（分别为B-PCM和P-PCM）处理过的土壤的行为。mPCM释放并吸收了潜热，从而降低了土壤的温度变化率。冻融循环后，两种类型的mPCM对粉质黏土的无侧限抗压强度显示出不同的趋势。与B-PCM处理过的土壤中的片状团聚相反，使用SEM可以直观地捕获P-PCM专门处理过的土壤团聚体中存在的特征胶结团聚，该现象是由于压实导致P-PCM和土壤中泄漏的石蜡相互作用而形成的努力。此外，B-PCM减轻了冻融后粉质粘土的强度劣化，并且核壳比强烈地影响了土壤强度。这是由于压实作用下P-PCM中泄漏的石蜡与土壤相互作用而形成的。此外，B-PCM减轻了冻融后粉质粘土的强度劣化，并且核壳比强烈地影响了土壤强度。这是由于压实作用下P-PCM中泄漏的石蜡与土壤相互作用而形成的。此外，B-PCM减轻了冻融后粉质粘土的强度劣化，并且核壳比强烈地影响了土壤强度。