Reinforced concrete crushing: features of construction waste

In this article we will talk about the purpose for which and how the crushing of reinforced concrete is performed. In addition, we consider what technologies and what equipment is used in the implementation of these works.

Probably it is no secret to anyone that at least half of the modern domestic housing stock was rebuilt in the 60-70s of the last century. Like any structures, buildings have their own operational resource. As a result, construction sites are demolished, and new buildings are being built in their place.

Important: Each demolished object in one degree or another consists of reinforced concrete, which must be effectively processed. And, if the recycling of bricks and ordinary concrete is not a big deal, then recycling of concrete goods requires a special approach.

Features of utilization of reinforced concrete structures structures and products

Large construction waste resulting from the destruction of residential or industrial buildings is a serious problem for many construction companies.

Meanwhile, competently organized and effectively carried out recycling of reinforced concrete allows not only to solve this problem, but also to obtain the corresponding number of secondary building materials.

Secondary building materials can be used as a cheap alternative to new, more expensive materials, and this advantage can significantly reduce the cost of subsequent construction.

Scope of secondary concrete

As already mentioned, the recycling of used building materials allows you to get fundamentally new materials, the price of which is available. If during the processing of bricks we get a kind of building sand, then as a result of processing concrete products, you can get secondary crushed stone corresponding to GOST 25137-82.

The crushed stone made in this way is not much less than its natural counterpart, and therefore can be applied in the following areas:

• when arranging with their own hands the foundations of the floor and foundation;
• in the process of construction and repair of asphalt pavements;
• by production of construction solutions as a filler with average parameters of strength from 5 to 20 MPa;
• in the manufacture of a wide range of precast concrete and monolithic structures;
• during dumping of temporary or secondary roads;
• at construction of all types of sidewalk paths;
• during dumping of the basis for construction of the asphalted platforms;
• when building as a backfill, instead of missing soil;
• when conducting a wide range of works in landscape architecture.

Equipment for the destruction and recycling of concrete products

Reinforcement of reinforced concrete and its subsequent recycling is carried out with the use of specialized equipment - crushing and screening plants or technological lines. Crushing and screening lines are, as a rule, stationary equipment, while complexes can be mobile.

The difference between recycling on stationary and mobile equipment is significant. In the first case, you will need to load substandard concrete products onto the vehicle and take them to a special combine.

But at the end of processing, the resulting crushed stone once again will need to be loaded onto a vehicle and now delivered to the construction site where the recycled waste will be used as building material.

It is much more profitable to use a mobile complex, since this installation for recycling reinforced concrete can be used directly on the construction site.

The fact is that, where the building was demolished, there will always be new construction, which will most likely require crushed stone. As a result, we get a unique opportunity to save money and time by refusing to transport waste and recycled materials.

The complex equipment is based on powerful jaw or impact crushers. Extraction of reinforcing metallic inclusions is carried out by sifting out. When screening, the crushed stone of a certain fraction falls down onto the pallet, while metal remains on the grid, which is collected and sent to the smelter.

Recycling technology

Instruction for the disposal of large-sized construction waste involves the phased implementation of the following work:

• Large-sized fragments of concrete products are destroyed using hydraulic shears to sizes suitable for loading into a crushing plant;
• Destroyed concrete products enter the plant, and a crusher for reinforced concrete is turned on;
• After grinding the material to the required fractions, the mass of the processed material is poisoned on the vibrating screen, where secondary gravel is screened out and then metal inclusions are removed.

The technology where the finished product is separated from metallic inclusions by means of a sieve is traditional. Currently patented new technology recycling of reinforced concrete using magnetic screening.

The basis of such an installation used grinding screen, a system of electromagnets and water treatment system.

The equipment used in the installation, according to belonging to a particular technological chain, is divided into three categories:

• the first (preparatory) category includes bunkers for storing and supplying source material;
• the second (technological) category includes a impact crusher designed to separate concrete and reinforcement, as well as a screen combined with electromagnets for trapping heavy metals;
• the third The category of equipment in this complex includes a conveyor and a water treatment system.

Important: In fact, the technology system with metal sifting through a magnet also works as a traditional system based on the use of a vibrating screen. But when an electromagnet is used, the quality of cleaning of secondary rubble is much higher, since there are practically no metallic inclusions.

Conclusion

Переработка железобетона - это не только существенные преимущества с точки зрения заботы о чистоте окружающей среды, но и возможность экономить средства за счет использования вторичного, а потому менее дорогого строительного материала (см.также статью «Железобетонные блоки – основа современной строительной промышленности»).

More useful information and educational information can be found by watching the video in this article.