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高温环境下水泥改良土抗裂性能试验研究

Experimental Study on Crack Resistance of Cement-Stabilized Soil Under High-Temperature Conditions

  • 摘要: 针对温度对水泥改良土抗裂性能影响的问题,利用数字图像相关技术对不同高温环境下干燥的红黏土和水泥改良土试样表面进行连续应变场测量,定量分析了试样的裂缝形态变化,研究不同温度试样的水分蒸发率、裂隙演化特征、应变场和表面裂隙率演变规律,并通过SEM图像揭示了温度对水泥改良土抗开裂性能的影响机理。结果表明:在相同环境下,水泥改良土的水分蒸发速率高于红黏土的水分蒸发速率,而裂隙比相对减小;干燥时间相同时,较低温度试样表面应力集中现象更显著;随着温度的升高,水泥改良土表面裂隙的发育程度增加;干燥过程中,土块的收缩从裂隙边缘向整体扩展,温度越高最大收缩应变越小。因此,进行水泥改良土施工时,应优先选择35 ℃左右温度进行养护,以确保水泥改良土具有良好的抗裂性能。

     

    Abstract: To investigate the formation of distinct crack patterns in cement-stabilized soil under varying temperatures, the Digital Image Correlation technique was employed to continuously measure strain fields on the surfaces of dried red clay and cement-stabilized soil samples exposed to different high-temperature conditions. Quantitative analysis was conducted to examine variations in crack morphology, focusing on moisture evaporation rates, crack propagation characteristics, strain field evolution, and surface crack ratios across temperature gradients. Additionally, scanning electron microscopy (SEM) images were used to reveal the mechanism by which temperature influences the crack resistance of cement-stabilized soil. The results indicate that under identical environmental conditions, the moisture evaporation rate of cement-stabilized soil is higher than that of red clay, while the crack ratio is relatively lower. At equivalent drying durations, stress concentration on the sample surface is more pronounced at lower temperatures. As the temperature increases, the extent of crack development on the surface of cement-stabilized soil also increases. During the drying process, soil shrinkage initiates at crack edges and propagates progressively across the entire sample, with elevated temperatures correlating to reduced maximum shrinkage strain. To optimize the crack resistance of cement-stabilized soil in construction applications, a curing temperature of approximately 35°C is recommended.

     

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