Experiment Study On The Effect Of Construction Concrete Waste On Drainage Consolidation Of Dredge Slurry

With the rapid development of China's economy,cities are expanding constantly.In this process,a large number of construction waste is produced,and the utilization rate of construction waste is at a low level.The reuse of construction waste has become an urgent problem to be solved.On the other hand,the shortage of soil resources has also become a difficult problem.Many coastal cities started land reclamation to meet the growing demand for land.However,the dredged slurry can not meet the normal construction requirements for its poor characteristics.Vacuum preloading is the most widely used method for its effectiveness and convenience but not ideal for the clogging of plastic vertical drainage(PVD).And the electro-osmosis method could strength soil in a short time,but the interfacial resistance increases rapidly with the discharge of dredged,which needs to be improved.In this paper,consolidation test,laboratory vacuum preloading model tests and electro-osmosis tests are carried out to investigate the influence of construction concrete waste on the drainage consolidation of dredged slurry.In this paper,laboratory model tests are carried out by adding construction concrete waste into dredged fill with different particle size,gradation and dosage.The experimental results show that the permeability coefficient of dredged fill increases with the addition of crushed concrete waste,which improves the effect of vacuum preloading.The test group with 1~2 mm particle size crushed concrete wastes added shows the greatest improvement,and with the increase of mixing content,the improvement also increases.According to the result of electro-osmosis tests,after the crushed concrete wastes with different particle size range,gradation and content is added into dredged slurry,the effective potential becomes larger,thus the consolidation effect is improved.The electroosmosis method has a better consolidation effect when a large size distribution of crushed concrete is added,and the consolidation effect with a dosage of 8% is the best among all the electro-osmosis tests.