DOI: 10.3724/SP.J.1249.2018.02119

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2018/35:2 PP.119-127

Formation and development of oil contaminated saline soil solidified with lime and fly ash

To realize resource utilization of solidified oil contaminated soil, unconfined compressive strength and scanning electron microscope (SEM) experiments are used to quantify the interaction of lime content,fly ash content and oil-contaminated level under different curing periods. The response surface methodology is employed to optimize the formation and development of solidified soil strength and solidification mechanism. Results show that in the early curing (less than 7 d), the larger oil content and smaller lime and lay ash content (4% and 18%) are beneficial to the improvement of soil integrity, but excessive lime causes soil swelling and moisture entry. During the curing period of 7-14 d, solidified reaction is converted into chemical action, pozzolanic reaction between the solidified materials leads to a larger increase of lime and fly ash content. The pozzolanic reaction delayed by the physical entrapment of oil causes that the strength at the final stage of solidification (14-28 d) still increases greatly, the resultants and fly ash combined with solidified oil pollutants, and the heavily oil contaminated soil form large aggregates with loose structure which reduces the degree of crystallization of resultants. As to the heavily oil contaminated soil, it is suggested that we should properly increase the lime, fly ash content and extend curing period in order to stabilize the strength and ensure the performance of solidified materials.

Key words:oil-contaminated soil,unconfined compressive strength,response surface methodology,scanning electron microscope,lime and fly ash treatment,inshore saline soil

ReleaseDate:2018-03-20 15:26:56

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