Recycled Concrete Aggregate

The demolition of buildings, roads, bridges and other structures generates hundreds of thousands of tons of construction waste every year. With the continuous improvement of environmental protection awareness, it is increasingly difficult to obtain high-quality aggregates in many areas, and the recycling of concrete has become more and more important. It can protect the environment and recover a new type of aggregate from the parent concrete, which is derived from natural aggregates: recycled concrete aggregates.

In this article, I will share the definition, advantages, application and processing technology of recycled concrete aggregates.

What is Recycled Concrete Aggregate (Definition)

Recycled concrete aggregate, also known as crushed concrete aggregate. It uses recycled concrete from demolished buildings, roads, bridges and other structures as raw materials, and is crushed and screened by machines to form concrete aggregates.

Why Use Recycled Concrete Aggregate (Advantage)

Aging infrastructure, scarce landfills, cost savings and environmental benefits, all of which are driving the growing demand for concrete recycling.

The use of recycled concrete to produce recycled aggregate has the following advantages:

Recycling construction waste at the demolition site can reduce construction and transportation costs, as well as energy use and road and equipment losses.

The recycled aggregate can be used immediately after processing, which is more economical than crushed natural aggregate.

The use of recycled concrete aggregates can reduce the need for virgin aggregates, thereby reducing the environmental impact of the aggregate extraction process.

Application of Recycled Concrete Aggregate

As a structural material, recycled concrete aggregate has many uses:

  • Aggregate for mixing new concrete: Crushed concrete can replace some of the virgin (new) aggregate used in ready-mix concrete. Used for road construction, buildings and bridge engineering.
  • Used for permeable paving of sidewalks, driveways and other outdoor hard surfaces.
  • Landscaping mulch.
  • Bed foundation material for trenches containing underground utility lines.
Permeable brick

How to Make Recycled Concrete Aggregate (Process)

The recycling of concrete is to crush the existing concrete to remove the steel bars and other embedded materials, and then pass through the fine crushing and screening system to produce recycled aggregates of different sizes.

Processing Method of Recycled Aggregate

  • One method is to transport the concrete fragments to construction waste recycling stations or quarries for crushing and screening.
  • Another method is to use portable or crawler crushing stations to crush and screen construction waste at the demolition site.

Process Flow

Concrete fragments→ vibrating feeder jaw crusher (rough breaking) iron remover (removal of steel bars) vibrating screen light material separation system impact crusher (fine breaking) removal Ironware Vibrating Screen Recycled Aggregate

The quality of recycled concrete aggregates largely depends on the quality of recycled raw materials (concrete construction waste). Therefore, steel bars and other embedded objects (asphalt, soil, glass, gypsum board, wood and roofing materials) must be removed from construction waste.

Water flotation, hand-picking, air separators and electromagnetic separators are usually used to ensure that the recycled concrete is free of metals, clay, wood, dirt, plastics and organic materials.

Case Study

100 TPH Construction Solid Waste crushing Plant

Construction Solid Waste crushing Plant
(Crushing plant of waste recycling station)
  • Raw material: construction waste (demolition waste, decoration waste, concrete block)
  • Capacity: 100 TPH
  • Finished product size: 0-5 mm, 5-10 mm, 10-31.5 mm
  • Product use: recycled aggregate, recycled sand, recycled brick material
  • Equipment List:Impact crusher, vibrating screen, light material winnowing machine, belt conveyor, steel structure platform

Contact concrete recycling experts to get detailed information about the equipment purchase costs, solutions and cases of the concrete recycling business.

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