水泥稳定碎石振动与静压成型物理力学指标关系

Relationship on index of physics and mechanics cement-stabilized aggregates between vibrating and static compacting methods

摘要:

为了明确振动和击实(静压)成型方法对水泥稳定碎石基层材料的物理、力学性能的影响,明确强度差别产生的原因,采用振动成型仪对水泥稳定碎石进行振动成型,测定物理力学指标,并与击实(静压)成型试件的性能进行比较．试验表明振动成型水稳碎石的最佳含水量和最大干密度与击实成型具有线性关系,振动成型下的最大干密度与击实成型相比平均提高0.04 g/cm³,增加的幅度在1.8％左右;振动成型总体强度比静压成型提高70％,其中60％的强度增加量源在于骨架的嵌挤作用;基于强度等效原则,可节约水泥质量2％～3％; 按级配类型回归曲线的斜率表征级配类型对工艺的适应性,截距表征了级配的在强度方面的优劣．研究表明,振动的成型对于无机结合料集料类基层材料,其优越性不仅仅在于提高密度,更在于其对于级配结构性作用的提高,使材料的级配效应得到充分发挥．

Abstract:

In order to compare physical and mechanical performance of the cement stable macadam roadbase material between vibration and compaction (static) forming methods, and clarifing reasons of strength difference. Vibration molding was applied for cement stable macadam in test, after curing the physical and mechanical indexes were measure, and comparied with that of the standard compaction (static compaction) specimens. Experiment results show that the relationship of optimum water content and maximum dry density between the vibration molding and standard compaction is inear, the maximum dry density of vibration molding increases 0.04 g/cm³ compare of that of standard compaction, increasing range at around 1.8％. The vibration molding specimens compressive strength increased by 70％ than that static compaction molding overall, 60％ increasing strength comes from skeleton embedded role. Based on the strength equivalent principle, the contant of cement can be saved 2％ to 3％ in cement stable macadam. According to the regression curves of different gradation, the slope of the curve present characterization of adaption for compaction methold, intercept represents the distribution in the aspects of quality in strength. Reseach indicate that for inorganic stabilized aggregate materials, vibration molding’s advantage is not only to improve dry density, but to enhance materials gradation structural effect fully.