The Application Of Construction Waste On The Water-permeable Bricks And Urban Roads

According to statistics, currently the amount of construction wastes what produced from constructing new buildings and demolishming old buildings has reached to 2, 400, 000～3, 600, 000 ton annual in china. Recycling construction wastes can not only resolve the problem of a great deal of construction garbage stacked polluting our entironment but also reduce the demand of natural sandrock, having the good economic performance, social performance and environmental protection performance.Therefore making construction wastes to be recycled is very necessary.In this paper in two areas of construction waste for recycling and reuse, On the one hand, use the higher intensity of discarded construction waste to make Water permeable brick; on the other hand, for the large number of construction waste, this paper will study its use in urban roads.About the Water permeable brick, this paper study on mixture ratio design, aggregate sizes, water-cement ratio, the amount of water reduce,fly ash,silica fume influence of permeable brick strength and the impact of flooding coefficient.Though experiments,identified flooding blocks the production process and paramenters:water-cement ratio 0.26,the amount of silicon power 5%,fly ash 10%,superplasticizer 0.8%(the percentage of cement quality).Static process by molding,molding pressure 4MPa,packing time 90s. Through the experimental study, above generating water percolation brick compressive strength 28MPa, above anti-booklet intensity 4.5MPa, above perviousness factor 1.0cm/s, satisfies the profession request and the operation requirements.In the garbage for urban road construction, this paper main study about use it for base course and subbase course of urban road. Through the civil engineering experimentation, And the consolidation of identifying the type and amount of additives, were identified at base course and subbase course primary component of the ratio. Roadbed to modulus of resilience of more than 20 MPa, subbase course 7 days unconfined compressive strength reached 2.5 MPa, compressive modulus rebound to around 740 MPa. Through testing, data shows that cities will be used for road construction waste and the roadbed at the end of the grass-roots level is feasible. Test sample 7d which through the room in the tentative data analysis, according to which draws up various proportions compounds without the side to limit the resistant to compression snapping back module ≥200MPa, therefore the construction waste residue may use in the path roadbed backfill material directly after stave, in which aggregate occupies the proportion should not be lower than 30%; To path subbase material, when in the construction waste residue the aggregate occupies the proportion is not lower than 50%, prepares the test sample 7d without the side to limit resistant to compression snapping back module740 MPa, can be used in preparing the path subbase material.