为解决新疆盐渍软土地区路基腐蚀、盐胀等病害问题,研究了气泡混合土试件在冻融-盐蚀复合作用下试件的剥落损伤情况,对比不同配合比的气泡混合土试件的剥落厚度变化规律;采用外包裹彩条布的方式增强气泡混合土试件的抗侵蚀能力,评价其增强抗侵蚀性能的效果;此外,以仅在盐侵蚀单独作用下的气泡混合土试件的剥落损伤情况作为对比,探讨冻融对气泡混合土损伤的加剧程度。结果表明:采用向气泡混合土试件中掺加矿渣或包裹彩条布的方法均能够显著增强气泡混合土试件的抗盐侵蚀性能和抵抗冻融-盐蚀复合破坏的能力;盐蚀-冻融复合作用下,气泡混合土试件的损伤程度显著高于其仅在盐溶液侵蚀环境下的损伤程度。由此证明,采用耐腐蚀性强、抗冻性好的气泡混合土作为路基填料,可起到减轻路基荷载、增强路基耐久性的作用,是解决新疆盐渍土地区路基病害的有效手段。
To solve the problem of subgrade diseases in saline soft soil area in Xinjiang, the spalling damage of foamed cement banking specimens under the combined effect of freeze-thaw and salt corrosion was studied, and the exfoliation thickness variation rules of foamed cement banking specimens with different mix ratios were compared. The corrosion resistance of foamed cement banking was enhanced by wrapping color strip cloth, and the effect of enhancing corrosion resistance was evaluated. In addition, the damage caused by freeze-thaw circulation to foamed cement banking was discussed through measuring the exfoliation damage of foamed cement banking specimens under salt erosion as a contrast. The results show that the method of adding slag content in the foamed cement banking or wrapping color strip can significantly enhance the salt corrosion resistance and the ability to resist the combined effect of freeze-thaw and salt corrosion. Under the combined effect of salt corrosion and freeze-thaw, the damage degree of the foamed cement banking specimen is significantly higher than that of the specimen only in the salt solution erosion environment. These results prove that using the foamed cement banking with high corrosion and freezing resistance as subgrade filling can reduce the load and enhance the durability of subgrade, which is an effect way to solve the problem of subgrade diseases in saline soft soil area in Xinjiang.
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