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文章以三峡库区广泛分布的废弃风化砂为研究对象,采用3%、5%、7%、9%的水泥稳定废弃的风化砂,在标准条件下,分别养护7 d、14 d、21 d、28 d后,进行无侧限抗压强度试验。试验研究结果表明:水泥稳定废弃风化砂可以用作各级公路的基层和底基层,其无侧限抗压强度能达到规范要求的值。在各级龄期下,水泥稳定废弃风化砂无侧限抗压强度随水泥掺量的增加而增大,且增长的幅度先逐渐增大后逐渐减小;在各级水泥掺量下,水泥稳定废弃风化砂的无侧限抗压强度随着龄期的增长而增大,且随着龄期的增长,其增加幅度逐渐减小。通过拟合分析,建立起了水泥稳定风化砂的无侧限抗压强度、水泥掺量及龄期三者之间的函数关系,可以由此计算出某一水泥掺量、某一龄期下水泥稳定风化砂的无侧限抗压强度。
Taking the abandoned weathered sand widely distributed in the Three Gorges reservoir area as the research object, weathered and weathered sandy sand stabilized with 3%, 5%, 7% and 9% cement was used for seven days and 14 days and 21 days respectively under standard conditions After 28 days, the unconfined compressive strength test was carried out. Experimental results show that the cement-stabilized waste weathering sand can be used as the base and sub-base of highway at all levels, and its unconfined compressive strength can reach the value required by the code. Under all ages, the unconfined compressive strength of cement-stabilized abandoned weathered sand increased with the increase of cement content, and the increasing amplitude increased gradually and then decreased gradually. At all levels of cement content, cement The unconfined compressive strength of stabilized abandoned weathered sand increases with age, and decreases with the increase of age. Through the fitting analysis, the unconfined compressive strength, cement content and cement age of cement-stabilized weathering sand have been established, which can be used to calculate a cement content, under certain age Unconfined compressive strength of cement stabilized weathered sand.