摘要
在重载交通和雨水综合作用下,泡沫沥青冷再生路面常因混合料抗剪切性能和密实性不足发生车辙和水损病害。为了设计出适用于多雨重载公路泡沫沥青冷再生混合料中粒式级配,在对散体力学剪切模量和最小空隙率分析的基础上,以铣刨料为原料,以剪切模量和最小空隙率为粗、细集料级配的设计指标,以体积法为级配合成方法,以贝雷法参数为检验标准,并选取多级嵌挤密实型级配和级配中值为对照,以冷再生混合料抗剪强度参数和路用性能为验证,最终提出高抗剪密实型泡沫沥青冷再生混合料中粒式级配设计方法。综合不同级配下泡沫沥青冷再生混合料的高温稳定性和水稳定性,以满足规范路用性能的混合料级配曲线为上下限,确定了推荐级配范围。结果表明:新设计的级配的粗集料和粉料含量高,细集料含量低,与SMA级配相似,新级配的粗铣刨料表面粗糙度高,接触面多,形成的骨架结构可有效传递车辆荷载,适量的胶结料能有效进行填充,空隙率小;混合料具有较大的内摩擦角和黏聚力,混合料高温稳定性较级配中值提高131.3%,远高于规范对重载公路动稳定的要求,水稳定性能相对于级配中值提高12.3%,均远高于规范限值;选用铣刨料进行级配设计,加入适当比例的新料不会对冷再生料力学性能产生不利影响。
Under the combined action of heavy traffic and rain,rutting and water damage often occur in cold recycled foam asphalt pavement due to the lack of shear resistance and compacting property of the mixture.To design the medium-sized gradation of cold recycled foam asphalt mixture for rainy heavy traffic roads,based on the analysis of mechanical shear modulus and minimum air voids of granular materials,with milled materials as raw materials,shear modulus and minimum air voids as the design indicators of coarse and fine aggregate gradations,volume method as the grading method,and Bailey method parameters as the inspection criterion,selecting multi-stage embedded dense gradation and the median gradation as the contrast values,and taking the shear strength parameters and road performance of cold recycled mixture for verification,the design method of medium-sized gradation for higher anti-shearing dense type foamed asphalt cold recycled mixture is finally proposed.Considering the high-temperature stability and water stability of foamed asphalt cold recycled mixture with different gradations,with the mixture gradation curve values which meet the standard road performance as the upper and lower limits,the recommended gradation range is determined.The result shows that(1)The newly designed gradation has high content of coarse aggregate and powder,and low content of fine aggregate,which is similar to SMA gradation.The rough milling material in the new gradation has high surface roughness and many contact surfaces.The formed skeleton structure can effectively transfer the vehicle load,and the appropriate amount of binder can fill effectively with small air voids.(2)The mixture has a large internal friction angle and cohesion.The high-temperature stability of the mixture is 131.3%higher than that of the median gradation,which is far higher than the requirements of the specification for dynamic stability of heavy traffic roads.The water stability is 12.3%higher than that of the median gradation,which is far higher than the specification limit value.(3)When using milling materials for gradation design,adding appropriate proportion of new material will not adversely affect the mechanical properties of cold recycled materials.
作者
李秀君
赵麟昊
高世柱
欧阳欢
王宁宁
LI Xiu-jun;ZHAO Lin-hao;GAO Shi-zhu;OUYANG Huan;WANG Ning-ning(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Survey and Design Research Institute Co.,Ltd.,Shanghai 200093,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2022年第12期1-7,26,共8页
Journal of Highway and Transportation Research and Development
基金
住房城乡建设部2018年科学技术项目(2018-k9-062)。
关键词
道路工程
泡沫沥青冷再生
高抗剪密实型
多雨重载公路
中粒式级配
抗剪切性能
水稳定性
road engineering
cold recycling of foamed asphalt
higher anti-shearing dense type
rainy heavy traffic road
medium-sized gradation
shear resistance
water stability
