摘要
以棱角状碎石和圆角状卵石(后者又分为球体和椭球体)为粗集料,测试了集料颗粒形状对骨架结构VCADRC的影响。结果证实,棱角状碎石的VCADRC明显大于圆角状卵石的VCADRC,圆角状卵石中又以椭球体颗粒的VCADRC大于球体颗粒的VCADRC。在此基础上,对SMA-20等3种典型配比的混合料分别采用马歇尔及SGC成型。通过混合料体积指标的测定及对比分析,发现相对于圆角状卵石而言,由棱角状碎石颗粒构成的混合料具有较大的VV、VMA、VCAmix,而且混合料的抗变形能力及稳定性均较优。
Angularity-shaped crushed stone and well-rounded cobble are used for coarse aggregate, the cobble can be described by sphere-shaped and ellipsoid-shaped. The influence of particle shape on VCADRC for skeleton structure is tested. Results confirm that VCADRC formed by crushed stone is obviously higher than VCADRC formed by cobble. Among cobble,VCADRC formed by ellipsoid is higher than VCADRC formed by sphere. On the basis of the results above, three typical proportioning mixtures of SMA-20 are chosen for Marshall and SGC forming. By determination and contrastive analysis in the volume index of asphalt mixture, it can be found that compared with mixture composed by well-rounded cobble, VV, VMA and VCADRC mixture formed by angularity-shaped crushed stone are greater. Further more, resistance to deformation and stability of angularity-shaped crushed stone are higher.
出处
《公路》
北大核心
2007年第3期112-118,共7页
Highway
基金
国家教育部博士点基金项目(2004613018)
关键词
集料颗粒形状
骨架结构
体积指标
SGC压实特性
particle shape of aggregate
skeleton structure
volume index
SGC compacting characteristics
