三灰花岗岩风化料底基层路用性能  

Road sub-base course performance of lime-flyash-cement stabilized weathered granite material

作　　者：郭永建[1,2] 谢永利[3] 牛富生[1,2] 周浩[3] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092 [3]长安大学公路学院,西安710064

出　　处：《哈尔滨工业大学学报》2013年第4期101-104,共4页Journal of Harbin Institute of Technology

基　　金：交通部西部交通建设科技项目(200631881291)

摘　　要：针对高速公路沿线存在大量风化花岗岩裸露的问题,通过理论研究并结合工程实践,对花岗岩风化料作进一步的改良,以实现大量挖方工程弃土的再利用,解决花岗岩风化料存在的易崩解、级配不良的缺点.提出水泥、石灰、粉煤灰、花岗岩风化料的质量比分别为2∶4∶16∶78(方案Ⅰ)、2∶6∶14∶78(方案Ⅱ)、2∶8∶12∶78(方案Ⅲ)的3种三灰改良方案,采用击实、强度、干燥收缩和温度收缩等4类试验,对三灰花岗岩风化料作为路面底基层的材料特性与改良效果进行对比评价.试验结果表明,无侧限抗强度随石灰掺量先减小后持平;随粉煤灰含量增加先持平后增大;方案Ⅰ、Ⅱ的最大干密度均较大,为较优的方案;相比方案Ⅰ具有最好的抗压强度与劈裂强度,方案Ⅱ次之,方案Ⅲ最差;方案Ⅰ、Ⅱ的干缩性能较为接近,方案Ⅲ的干缩性能较差.综合试验结果,可以得出方案I为最优的三灰花岗岩风化料配比方案,并适宜于作为路面底基层进行应用.Aiming at the problem of large number of the weathered granite existed along the expressway, and to recycle the excavation and meet the social and economic benefits, this paper attempts to improve the properties of weathered granite material which is easy to disintegrate and poorly graded. The lime-fly-ash- cement was used to improve the weathered granite material for the pavement sub-base. Three different mix proportion, the mass ratio of cement： lime： fly-ash： weathered granite is： I （2： 4： 16：78 ）, II （2：6： 14：78 ）, m ~2： 8： 12： 78） were tested; And four tests of compaction, strength, dry shrinkage and temperature shrinkage were taken to evaluate the effect of road base course performance of lime-fly-ash-cement stabilized weathered granite material. The tests result shows that the strength decreases first and then keeps stable with the increasing of lime, and keeps stable first and then increases with the increasing of fly-ash. The plan I and II have bigger maximum dry density, the compressive strength and spilt strength of plan I are the biggest, those of plan II are the second. The drying shrinkage of plan I and II is similar, and that of plan III is the worst. The rule of temperature shrinkage is the same to the drying shrinkage rule. According to experimental result, the best mix proportion scheme is mix proportion I （2： 4： 16： 78）, which is suitable to the pavement sub-base.

关 键 词：花岗岩风化料 三灰 底基层 路用性能 

分 类 号：U414[交通运输工程—道路与铁道工程]