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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.
Many diseases of pavement in permafrost area are directly related to grass-roots condition.As a semi-rigid grass-roots material in our country, cement stabilized gravel has been widely used in highway pavement structure in permafrost regions.In order to study the effect of cement stabilized gravel cement Content and different frostbite age were studied. The freezing and thawing temperature, the freeze-thaw time, the number of freeze-thaw cycles, the age of the samples and the frost resistance index of cement stabilized gravel The results show that the higher the cement dosage is, the higher the compressive strength value of the cement stabilized grit before and after freezing is, the better the frost resistance is. The compressive strength of the cement stabilized grit after 28 d, The compressive strength and the splitting strength after freezing and thawing have both increased obviously, which proves that the cement-stabilized grit has some frost resistance since the 28th day.The proposed frost resistance test methods and indexes are suitable for the semi-rigid base material in the permafrost region, Certain practical value.