期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 196, 期 -, 页码 204-213出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.11.060
关键词
Silty clay; Waste fly ash and oil shale ash; Subgrade material; Physical property; Mechanical property; Environmental impact
资金
- National Natural Science Foundation of China [51578263]
- Transportation Science & Technology Program of Jilin Province [2015-1-11]
- Scientific and Technological Planning Project of Ji Lin Province [20180201026SF]
- Open Fund Project of Loess Earthquake Engineering Key Laboratory of China Earthquake Administration, Gansu Province, China [KLLEE-17-002]
The objective of this study was to evaluate the viability of utilizing waste fly ash (FA) and oil shale ash (OSA) to modify silty clay (SC) as a subgrade material. First, the modified soils at five different ratios of OSA/FA/SC were prepared. Second, the compaction, Atterberg limits and CBR (California bearing ratio) tests were conducted to determine the optimum ratio of OSA/FA/SC. Third, the static and dynamic mechanical characteristics of the modified soil at the optimum ratio of OSA/FA/SC were measured. Subsequently, the environmental impact of the modified soil subgrade leachates on water was assessed. The results show the physical properties of SC are improved by the addition of FA and OSA. The modified soil at the OSA/FA/SC ratio of 40:20:40 possesses the highest CBR value, propriate physical properties and the balanced usage ratio of FA, OSA and SC. The triaxial tests demonstrate that the static strength parameters and dynamic fracture strength of SC are significantly increased by FA and OSA. The obtained dynamic modulus could be valuable for evaluating the deformation and stability of this modified soil in geotechnical engineering. The main ions and trace elements concentration analysis results indicate that the modified soil leachates have no pollution on Class II surface water and Class Ill ground water. Based on these results, SC modified by FA and OSA has the potential to be used a viable subgrade material. (C) 2018 Elsevier Ltd. All rights reserved.
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