摘要
对西非马里地区红土粒料的基本物理性能、矿物织构组成与路用性能进行试验研究。结果表明,红土粒料砾石组的主要成分是赤铁矿石(40.6%)和高岭石(39.5%),粉黏粒组主要由赤铁矿石(27.0%)和石英(63.0%)组成,高岭石含量仅10.0%;颗粒容易发生破碎,其中19~2 mm粒径颗粒抗冲击能力差,当击实次数超过98次时颗粒破碎趋于稳定;在欠压实状态下,干密度与颗粒破碎率的关系呈近似线性增长规律,当破碎率大于25%后,压实度普遍能达到98%以上;红土粒料的水稳性较差,但在96%压实度前提下,饱水4 d的CBR接近80%,回弹模量变化范围在190~300 MPa之间,可满足西非地区路面底基层的使用要求。
The mineralogical compositions and engineering properties of lateritirica were investigated. The results show that , the main composition of the Hematite （40. 6% ） and Kaolinite （ 39. 5 % ） , and those of the laterite of fine - grain is Hematite （27. 0% ） , Quartz （63. 0% ） and Kaolinite （10. 0 % ） . T h e particles are easy to break , especially for the diameter of 19 ？2 mm , and the aggregate break d o w n will stop till the the heavy proctor compaction test. At an under - compacted state , as the dry density increase. When the crush is beyond 2 5 % , compaction degree b e c o m e s greater than 9 8%.Laterite has bad water stability. But the CBR of 4 days water immersed samples at a compaction degree of 96% or the above , is nearly 80 , and the elastic modulus of samples at a compaction degree of 96% range from 190 MPa to 300 MPa , which show that the concerned laterite is convenient for subbase course construction.
出处
《公路工程》
北大核心
2017年第5期327-331,共5页
Highway Engineering
关键词
红土粒料
矿物构成
路用性能
CBR
回弹模量
lateritic gravels
mineralogical compositions
pavem e n t performance
CBR
elastic modulus
