【作者】 姜斌；

【导师】 程培峰；

【作者基本信息】 东北林业大学 ， 道路与铁道工程， 2008， 硕士

【摘要】 水泥稳定砂砾材料已经广泛的应用于公路路面基层的铺筑,和其它半刚性基层材料一样,用水泥稳定砂砾铺筑基层的路面也容易产生裂缝。为阻止或延缓水泥稳定砂砾基层路面裂缝的产生,论文根据《公路沥青路面设计规范》JTG D50-2006中的骨架密实级配范围是以水泥稳定碎石为研究对象提出的这一情况,以天然砂砾为研究对象,采用逐级填充插捣试验与理论计算Ⅰ法相结合的方法确定了水泥稳定砂砾骨架密实型级配,提出水泥稳定砂砾骨架密实型级配范围,补充了《公路沥青路面设计规范》JTG D50-2006中骨架密实型水泥稳定类砂砾集料级配,并且根据水泥稳定砂砾骨架密实型级配范围中4.75mm筛孔的通过率划分了水泥稳定砂砾基层材料各组成结构类型。在此基础上研究了不同组成结构类型、不同水泥剂量水泥稳定砂砾混合料的强度和刚度特性,采用支架法进行了水泥稳定砂砾基层材料的干燥收缩试验,采用应变片电测法进行了水泥稳定砂砾基层材料的温度收缩试验。试验结果表明,随着水泥剂量的增加水泥稳定砂砾基层材料的平均干缩系数增大,平均温缩系数先减小后增大;三种组成结构类型的干缩抗裂性能的优劣次序为GK＞GM＞XM,温缩抗裂性能优劣次序为GM＞GK＞XM。根据试验结果确定了合理的水泥稳定砂砾基层材料配合比,提出了水泥稳定砂砾基层材料的弯拉模量和弯拉强度设计参数推荐值。更多还原

【Abstract】 The cement-stabilized gravel base materials have been extensively used in base paving, the pavement with cement-stabilized gravel base, as the other semi-rigid base, easily product cracks. In order to prevent or delay the cracks, according to the dense framework structure gradation range is proposed by regarding cement-stabilized macadam as the research object in Specifications for Design of Highway Asphalt Pavement JTG D50-2006,natural gravel is regarded as the research object in this paper, the method of combining step filling test and theoretical calculation I method is introduced to determine dense framework structure mixture gradation of cement-stabilized gravel, a supplement of dense framework structure of cement-stabilized aggregate gradation is made. The composition structure types of cement-stabilized gravel base were classified by adopting the passing rate of 4.75mm after proposed the dense framework structure gradation range. Then the strength and stiffness characteristics of cement-stabilized gravel mixture were studied with different composition structure types and different cement dosages ,cement -stabilized gravel base materials drying shrinkage test were carried out by using bracket method; cement-stabilized gravel base materials temperature shrinkage test were carried out by using resistance strain-gauge testing method. The results showed that with the cement dosages increased, the average dry shrinkage coefficient of cement-stabilized gravel course materials increased; the average temperature shrinkage coefficient of cement-stabilized gravel course materials decreased first and then increased. In three composition structure types, the dry shrinkage crack resistance order is GK >GM >XM; temperature shrinkage crack resistance order is GM>GK >XM. According to test results, the cement-stabilized gravel base materials mix proportion with good mechanical property and crack resistance were determined, the design parameters recommended value of cement-stabilized gravel base materials was proposed.更多还原