Experimental Study on the Stabilization Effects of Dredged Sludge by Fly Ash or Phosphogypsum

Abstract:

It is very essential to explore a more efficient and a lower-cost stabilizer based the traditional stabilizer, lime. Through the laboratory test, this article made a comparison on the stabilization effects from the water ratio limit and unconfined compressive strength of the stabilized sludge, which was processed by using two common industrial wastes as stabilizers, fly ash and phosphogypsum, with the lime. The laboratory experiment results indicate that liquid limit and plastic limit of phosphogypsum compound stabilizers have a significant increase compared with the single lime added solidified sludge, but little change in the plasticity index over a curing age of 7 days or 28 days; while that of by adding fly ash has almost no change in liquid limit and plastic limit compared with the single lime added solidified sludge. Meanwhile the solidified sludge by adding the previous two stabilizers have an increase in unconfined compressive strength compared with the single lime added solidified sludge. Comprehensively compared above, the waste phosphogypsum as the extra additive stabilizer of the lime makes the optimal effect.

• Periodical: Advanced Materials Research (Volume 689)
• Pages: 342-347
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.689.342
• Online since: May 2013
• Authors: Zhi Hua Yu, Yue Gui, Qing Zhang, Xiang Yun Kong
• Keywords: Dredged Sludge, Fly Ash (FA), Phosphogypsum, Stabilization, Unconfined Compressive Strength (UCS), Water Ratio Limit

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