高速公路上路床二灰土材料配比试验研究
2017-12-13顾振平刘迪李博文海龙
顾振平++刘迪++李博文++海龙
[摘 要]将二灰土用作高速公路上路床材料,既可保障公路结构强度要求,又可大量利用粉煤灰,还可降低石灰和土的使用量。火山灰反应是形成二灰土强度和水稳定性的主要因素。结晶作用和火山灰反应形成的胶凝物质和氢氧化钙的保护膜能够固结土壤团粒,这种作用的持续发展使二灰土整体强度增强。以华能营口电厂粉煤灰、盖州本地产熟石灰稳定当地风积土可作为高速公路上路床材料。配比为熟石灰:粉煤灰:风积土=3:6:91的二灰土作为高速公路上路床填料时,最佳含水率为15.1%,压实度需控制在96%以上;配比为熟石灰:粉煤灰:风积土=4:12:84的二灰土作为上路床填料时,最佳含水率为16.8%,压实度需控制在96%以上。
[关键词]二灰土;上路床;火山灰反应;配比;最佳含水率
中图分类号:TU57+8.1 文献标识码:A 文章编号:1009-914X(2017)40-0169-03
Study on the lime-ash soil material ratio test of the highway road bed
GU Zhen-ping1, LIU Di2, LI Bo-wen3, HAI Long4
(1.Kailuan Group Donghuantuo mining branch, Tangshan Hebei,063000,China;
2.Kailuan Group Lvjiatuo mining branch, Tangshan Hebei,063000,China;3.Liaohe Oilfield Logging CNPC, Panjin Liaoning 124010, China;
4.School of Mechanics and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China;)
[Abstract]Lime-ash soil used for highway roadbed material, can not only ensure the structural strength requirement of highway and using fly ash abundantly, but also reduce the consumption of lime and soil. Pozzolanic reaction is major factor of lime-ash soil strength and water stability. Crystallization and ash reaction formation of the gel material and protective coatings of calcium hydroxide consolidation of soil aggregate, the sustainable development of this role to enhance strength of the overall structure of the lime-ash soil. In huaneng yingkou power plant fly ash,Gai zhou locally lime stable local general soil can be used as highway road bed material. Ratio of hydrated lime, fly ash, aeolian soil = 3:6:91 lime-ash soil can be used as highway road bed packing, The best moisture content is 15.1%, the degree of compaction shall be more than 96%; Ratio of hydrated lime, fly ash, aeolian soil = 4:12:84 lime-ash soil can also as a highway road bed filling,the optimum moisture content is 16.8%, the degree of compaction control in more than 96%.
[Key words]lime-ash soil; road bed; pozzolanic reaction; ratio; optimum moisture content
0 引言
我國是世界上最大的粉煤灰排放国,2012年的总排放量超过6亿t,按照综合利用率70%计算仍有1.8亿t未得到有效利用[1-2]。火力发电规模的扩大使粉煤灰的排放量和存量均逐年增加,大量土地被粉煤灰堆场占用,给发电企业带来巨大的经济压力,也对生态环境造成巨大破坏[2-3]。二灰稳定土是指在一般土料中添加石灰和粉煤灰来提高土的强度以用作回填材料[3-5]。将二灰土用作高速公路路床材料,既可保障路床的强度要求、提高工程质量,又可以大量利用粉煤灰,同时降低石灰和土的使用量。因燃煤工艺的不同,各发电企业排放的粉煤灰化学组成存在一定差异,物理和力学性质更是差异明显,利用方式也存在较大差别[6-9]。……