多年冻土区水泥稳定砂砾基层抗冻性能研究

发布时间：2018-05-11 11:05

本文选题：水泥稳定砂砾 + 抗冻性　；参考：《冰川冻土》2014年01期

【摘要】：多年冻土地区路面使用过程中的许多病害与基层状况直接相关.水泥稳定砂砾作为我国传统的半刚性基层材料,在多年冻土地区公路路面结构中得到了普遍运用.为研究水泥稳定砂砾不同水泥掺量、不同养生龄期下的抗冻性能,通过提出合理的抗冻试验方法分别进行了水泥稳定砂砾冻融温度、冻融时间、冻融次数、试件的养生龄期及抗冻指标方面的试验研究.结果表明:水泥剂量越高,水泥稳定砂砾冻前、冻后的抗压强度值越高,说明其抗冻性能越好;水泥稳定砂砾从28 d开始抗压强度、冻融后抗压强度及冻融后劈裂强度都明显增加,证明水泥稳定砂砾从28 d开始已具有一定的抗冻性.提出的抗冻试验方法和指标要求适合多年冻土地区半刚性基层材料,有一定的实用价值.
[Abstract]:Many diseases in the course of pavement use in permafrost area are directly related to the condition of base course. As a traditional semi-rigid base material, cement stabilized gravel is widely used in highway pavement structure in permafrost region. In order to study the frost resistance of cement stabilized gravel under different cement content and different curing age, the freezing and thawing temperature, time and times of freezing and thawing of cement stabilized sand gravel were studied by means of reasonable test method. Experimental study on the health age and freezing resistance of the specimen. The results show that the higher the cement dosage is, the higher the compressive strength of cement stabilized gravel is before freezing, the better the freezing resistance is, the higher the compressive strength of cement stabilized gravel is from 28 days. The compressive strength after freeze-thaw and the splitting strength after freezing and thawing are obviously increased, which proves that the cement stabilized sand gravel has a certain frost resistance from 28 days. The method and index of frost resistance test are suitable for semi-rigid base material in frozen soil area for many years and have certain practical value.
【作者单位】：青海省交通科学研究所;
【基金】：国家自然科学基金项目(40571068)资助
【分类号】：U416.21;U414

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