Abstract:

For Wenzhou waste pulp with high contents of water and clay, we study relationship between agent dosage and particle composition, turbidity, pH, muddy surface subsidence and liquid plastic limit in a free settling and one-dimensional consolidation test by adding different doses of curing flocculation. Effects of agent dosage on permeability and strength are also studied in a vacuum drainage model test. The following results are obtained. 1) The chemicals coalesce small particles by compressing twin electrical layer, but the degree is less than organic chemicals. 2) Waste pulp permeability coefficient becomes large in 3 or 7 days after the agents join in, decreases in other time. The reagent dosage and slurry permeability coefficient is large. In a range of low consolidation pressure, it can increase 5 $\sim $ 10 times as compared to the original waste pulp. 3) Chemicals with vacuum drainage can greatly improve the combination of vacuum drainage rate. In low water content at the same time, the strength, plastic limit, and liquid limit of the soil are increased. Test of vane shear strength is up to 47.1 kPa. The analysis shows that the effects of new chemicals on waste pulp by vacuum preloading mainly embodied in particle coalescence, increase permeability and increase drainage, and curing. By selecting appropriate chemical dosage and ages, significant treatment effect can result. It is worth of large scale promotion.

Key words: waste pulp, chemical, vacuum preloading, permeability, curing