Preparation method of recycled aggregate from building wastes

Abstract

The invention discloses a preparation method of recycled aggregate from building wastes, relating to the technical field of building raw materials. The preparation method comprises the following steps of: adopting a waste utilization technology, taking waste concrete, waste bricks and waste sand-lime building materials, which are smaller than 690mm, as raw materials, determining the quantity according to needs, crushing, further drying till the water content is not more than 0.5%, and then performing graded screening so as to prepare the recycled aggregate with the particle sizes of 0.075-0.15 mm, 0.15-0.3 mm, 0.3-0.6 mm, 0.6-1.18 mm, 1.18-2.36 mm, 2.36-4.75 mm, 4.75-10 mm and 10-32 mm and store the recycled aggregate with the different particle sizes respectively, wherein a magnet is applied in the graded screening process for removing metal as well as removing wood chips, plastics and other sundries according to the specific gravity. The recycled aggregate can be used as a building raw material. The preparation method has the advantages of protecting natural resources, saving labor, saving time, saving effort, realizing low cost, changing the wastes into valuable things, and meeting the requirements of low-carbon production and low-carbon living.

Description

technical field [0001] The invention discloses a method for preparing recycled aggregate from construction waste, which relates to the technical field of building materials; in particular, it relates to the technical field of raw materials for building materials; in particular, it relates to the technical field of preparation methods for recycled aggregate from construction waste. Background technique [0002] As far as building materials and building material raw materials are concerned, everyone is no stranger to them, especially when it comes to ready-mixed mortar, special mortar, concrete, aerated concrete blocks, and urban pavement bricks, especially building mortar and concrete. River sand is the basic raw material. With the rapid development of urban construction, the demand for mortar and concrete is increasing, and the mining of river sand is also increasing. After all, resources are limited, and river sand will become less and less. Invest a lot of manpower and ma...

AI Technical Summary

Problems solved by technology

River sand (that is, sand salvaged from rivers, rivers, and lakes by boats, its price is very high), and river sand must be dried before use. Since the water content of river sand is 98%, it will contain about 70% water after natural drying. -80% or so, the water content of the sand used for production must be less than 0.5%, so it costs a lot of money to dry the river sand, which not only consumes a lot of coal resources, but also the freight is extremely high, and the price soars

At the same time, on the other hand, the amount of demolition of old buildings in cities is increasing. Of course, there are more and more wastes after demolition, and more and more land has been occupied by centralized stacking.

The piles of garbage from existing demolished buildings are increasing day by day, and there is very little treatment. Moreover, solid waste, such as concrete, masonry, etc., is not easy to decompose, and it takes a long time to decompose naturally. The volume is too large to be absorbed, not only occupying land resources, but also not conducive to environmental greening, and after a long time, it is buried underground, which is not conducive to vegetation growth and hinders the filtering effect of soil on groundwater resources, etc.

To sum up, the deficiencies, defects and disadvantages of existing known technologies and the present situation are: on the one hand, waste of natural resources, time-consuming and labor-intensive work and increased additional costs, prices continue to soar and high costs; on the other hand, waste accumulation gradually The increase cannot be absorbed, occupies land resources, and has an impact on the environment; none of them meet the requirements of low-carbon production and low-carbon life

Images