Fly Ash, soil and lime mixtures as potential soil liner materials
(0) Samples of two soils (a silty clay and a silty sand) and two fly ashes (class C, and F) and their mixtures with quicklime were physically and chemically characterized. A test matrix was designed to study the fly ashes, soils, and soils containing 25％ fly ash by weight both with and without the addition of quicklime. The goal was to identify optimum combinations of these materials that have significantly lower hydraulic conductivities than the individual materials. From 2％ to 6％ by weight of quicklime was added to these soils, fly ashes, and soils with 25％ fly ash. The saturated hydraulic conductivities of the unamended soils, fly ashes, and fly ash amended soils compacted at their field water contents ranged from 1.81×10<-5> to 9. 63×10<-5>cm/sec. Additions of quicklime and compaction at different water contents in some cases reduced hydraulic conductivity by one to two orders of magnitude compared to the unamended samples. Reduced hydraulic conductivities of 3. 15×10<-7> to 6.88×10<-7>cm/sec were measured in samples of C-fly ash with 6％ quicklime, and C-fly ash-amended Soil 1 with 5％ quicklime. Such reduced hydraulic conductivi ties appear to be related to the pozzolanic and cementitious properties of C-fly ash. These screening tests demonstrated the feasi- bility of formulating optimum combinations of soil, fly ash and lime that possess very low hydraulic conductivities.
fly ash hydraulic conductivity leaching lime soils
S. V. Mattigod
Pacific Northwest National Laboratory Richland, Washington 99354, U. S. A
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
368-369
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）