不同成型方法级配碎石的抗变形性能

发布时间：2018-08-27 14:41

【摘要】：为研究不同成型方法对不同级配的级配碎石抗变形性能的影响,选取了振动压实法和静压法2种成型方法,悬浮密实结构(GD)和多级嵌挤骨架密实结构(TK)2种不同级配的级配碎石,利用回弹模量表征级配碎石的弹性变形特性,提出了稳定指数(SI)来评价级配碎石的塑性变形特性.采用2种方法成型试件后,在最佳含水量下测定其回弹模量;借鉴沥青混合料车辙试验来研究级配碎石的抗塑性变形能力,根据最大干密度和最佳含水量,按98%的压实度,利用振动压实法和静压法成型级配碎石试件,测定试件含水量为W_0、0.5 W_0和0的动稳定度.研究发现,不同成型方法下级配碎石的弹、塑性变形相差较大,且振动压实法级配碎石回弹模量为静压成型法的1.56~1.77倍,稳定指数为1.52~1.56倍.
[Abstract]:In order to study the effect of different molding methods on the anti-deformation performance of graded crushed stone, two kinds of molding methods, vibrocompaction method and static pressing method, suspension dense structure (GD) and multistage packed skeleton dense structure (TK) are selected. The elastic deformation characteristics of graded macadam were characterized by elastic modulus, and the stability index (SI) was proposed to evaluate the plastic deformation characteristics of graded crushed stone. After forming the specimen with two methods, the elastic modulus is measured under the optimum water content, and the plastic deformation resistance of graded crushed stone is studied by using the rutting test of asphalt mixture as reference. According to the maximum dry density and optimum moisture content, according to the compaction degree of 98%, The dynamic stability of the specimens with water content of W _ (0) and 0.5 W _ (0) and 0 were measured by means of vibration compaction method and hydrostatic compaction method to form graded crushed stone specimens. It is found that the elastic deformation of the lower grade crushed stone with different molding methods varies greatly, and the elastic modulus and the stability index of the vibratory compaction graded crushed stone are 1.56 ~ 1.77 times and 1.52 ~ 1.56 times as much as that of the hydrostatic molding method.
【作者单位】：长安大学特殊地区公路工程教育部重点实验室;中信建筑设计研究总院有限公司;
【基金】：中央高校基本科研业务费专项资金经费项目(编号:310821165023)
【分类号】：U414

【相似文献】