A new recycling system by using paper debris and polymer has been developed for high water-content mud such as bed materials in the river and lake, and construction sludge. The new recycling system proposed in this study consists of two steps. In the first step, the paper debris are added for controlling water content of mud and strengthening the bonding force between mud clusters. In the second step, polymer materials are added to increase the bonding force of mud particles in the cluster. By using this system, 200-500% water-content mud has been modified to landfill materials by 20-30 minutes mixing process.The unconfined and triaxial compression tests were carried out to examine the strength of the recycled soils. It was confirmed through the tests that the failure strain and residual strength of the recycled soils produced by the new system are much larger than those of recycled soils produced by the conventional method. Furthermore, the transformation coefficient of the recycled soils is close to the one of the ordinary soils. Therefore, it can be concluded that the recycled soils produced by the new system are much more suitable for landfill materials than the recycled soils produced by the conventional method. KEY WORDS : Paper Debris, Polymer, High-water Content Mud, Recycle
Double film extraction technique was used to elucidate the effects of a flow obstacle on the deposition rate of droplets in annular two-phase flow. In the present experiments, the test section was a round tube of 5 mm in inside diameter, air and water were used as test fluids and the flow direction was vertical upward; a short tube that was 2 mm in inside diameter, 3 mm in outside diameter and 20 mm in length was used as a flow obstacle. It was shown that the deposition rate of droplets was markedly increased if the present flow obstacle was concentrically placed in the flow channel. In all the experimental conditions tested, the deposition rates when the flow obstacle was placed were approximately 1.5 times larger than the deposition rates when no obstacle was placed. An empirical correlation was developed to elucidate the influence of flow parameters on the enhancement of deposition rate by the present flow obstacle of simple geometry.
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