KR100710514B1 - A road paving materials using construction waste and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a method for screening recycled aggregates for road auxiliary layer materials, and to road auxiliary layer materials using recycled aggregates selected by the present invention. The purpose of the present invention is to use recycled materials such as recycled aggregates that are recycled from construction waste as recycled aggregates. .

According to the present invention, there is provided a method for sorting recycled aggregates for road auxiliary layer materials, comprising: injecting waste concrete agglomerates of 500 mm or less into a hopper; Supplying the waste concrete to the hopper to a vibrating screen to sort the soil deposited on the surface of the waste concrete; Sorting the reinforcing bars and combustible wastes mixed in the waste concrete; Crushing the waste concrete from which the soil and various foreign matters are removed to less than 200 mm through the sorting steps; Removing combustible foreign matter by applying wind power to the crushed waste concrete; Washing the waste concrete from which foreign matters are removed through the above steps, and dehydrating after removing fine foreign matters; Crushing the washed waste concrete to a particle size of 150 mm or less; Selecting a recycled aggregate of 50 mm or less for road auxiliary layer material from the secondary crushed waste concrete; The step of crushing the waste concrete of 50mm or more of the selected waste concrete to 50mm or less.

Road auxiliary layer material, recycled aggregate, water purification sludge, waste recycling

Description

Screening method of recycled aggregate for road auxiliary layer material and road assisted layer material using recycled aggregate selected by it {A ROAD PAVING MATERIALS USING CONSTRUCTION WASTE AND METHOD FOR MANUFACTURING THEREOF}

1 is a longitudinal sectional view of a road.

Figure 2 is a process diagram of the method for sorting recycled aggregate for road auxiliary layer material according to the present invention.

The present invention relates to a road auxiliary layer material, and more particularly, it is possible to use recycled aggregate recycled from construction waste as a road auxiliary layer material, and in particular, various additives for use of the recycled aggregate for road auxiliary layer use By using this method, it is possible to increase the added value and to significantly reduce the amount of leftovers / reclamation of recycled aggregates, thereby reducing the associated costs for the treatment of unused recycled aggregates. The present invention relates to a road auxiliary layer material using selected recycled aggregate.

Recently, due to the rapid industrialization, the depletion of the existing resources is severe, and various wastes are increasing day by day. Therefore, in order to prevent pollution of the surrounding environment by waste, social costs of astronomical scale are required, and supply of alternative resources is urgently needed due to exhaustion of resources. However, according to the development priority policy and the policy of high-growthism, it was a reality that the environmental problem, which is the counter function in Korea, has been somewhat out of consideration. As a result of this growth-oriented policy, the growth of various wastes and pollutants by-products is now reaching an impending point that can no longer be delayed.

In particular, the construction industry wastes of various constructions and civil works show a sharp increase, mainly due to the recent redevelopment, revitalization of reconstruction and dismantling of structures due to aging and deterioration of urban and local buildings. do.

In general, construction waste refers to soil, sand, gravel, earth or mixed soil mixed with rubbish and waste materials, concrete lumps, waste wood, asphalt concrete lumps, and construction sludge. One of the main characteristics is that most of the construction wastes are composed of inorganic materials, which are harmless to the human body, and that various kinds of wastes are discharged in a mixed state, and the treatment is complicated and difficult. It is said to provide the cause of indifference between the government and industry regarding waste disposal.

Such indifference entailed a waste of valuable resources and caused deterioration of the quality of the recycled aggregates, and most of the utilization of the recycled aggregates was only used for earthworks, such as fill, cover, and landfill.

Therefore, it is necessary to actively minimize the environmental pollution, replace the scarce resources, and reduce the cost of the construction industry base by enabling the actual recycling through the management of such wastes.

As domestic supply and demand imbalances intensify in reality, the use of aggregate among waste concrete of construction waste as a substitute for natural aggregate is attracting attention, and research on this has continued since the mid-1980s based on the research results of Japan and others. In the 1990s, as the social factors such as the redevelopment of large cities and the physically destructive structures of buildings have been increased, research on waste concrete recycling has continued. Among them, waste concrete and waste bricks account for about 73.3% of total construction waste (as of 2003), accounting for most of construction waste.

As for the recycling of waste concrete, construction companies attempted to pave the road using recycled concrete, and research on the availability of auxiliary base materials, etc., was conducted in 1994 by the Ministry of Environment and the Ministry of Construction and Transportation. The recycling rate of construction wastes, including construction wastes, has been compulsory up to 20%. In 1999, KS F 2573 recycled aggregate specification was established to promote the recycling of waste concrete.

For example, waste concrete generated about 92,639 tons / day and recycled about 88,144 tons / day in 2003, and the recycling rate is over 95%. The recycling field is used as low-grade aggregates such as roadbeds and road substrates.

However, the limited use of recycled recycled aggregates produced from waste concrete as low grade soil is not an adequate response to domestic aggregate supply shortage, such as deterioration of aggregate supply and demand due to depletion of natural aggregate resources. In particular, coarse aggregates have crushed stone and fine aggregates have increased use of sea sand. As of 2000, 95% of the consumption of gravel is covered by crushed aggregates by the development of quarries. The use of crushed stone and sea sand is a problem of alkali aggregate reaction which causes expansion crack of concrete, which can significantly reduce the durability of the concrete. There is a problem of deteriorating the durability of the concrete by corroding the rebar.

In addition, the domestic aggregate consumption structure, the road construction use currently recycled aggregate is used 5 ~ 7%, if the aggregate supply and demand is intensified to about 10% of the total aggregate consumption should be prepared for the provision of concrete aggregate supply.

The fundamental reason why the recycled aggregate produced from waste concrete cannot be used as a substitute for high quality aggregate resources such as utilizing aggregate for general concrete is because recycled aggregate has significantly lower physical properties such as specific gravity and absorption rate than natural aggregate. In addition, there are two main causes of physical property degradation of recycled aggregates.

First, cement paste attached to the surface of the recycled aggregate.

Second, the mixing of foreign matter other than aggregate, such as bricks and tiles.

Recognizing this problem, in recent years, the quality of recycled aggregate produced is increased by spreading facilities for removing cement paste adhered to recycled aggregate, such as the addition of a crushing process. However, as the quality of recycled aggregates increases, the generation of cement paste as a by-product is increasing, and it is estimated that about 8 million tons of cement paste is generated annually, which is about 30% of the total amount of waste concrete generated from the concrete composition ratio. do.

In addition, recycled aggregates include aggregates composed only of cement paste from recycled aggregates, which are hardly coated with cement pastes, depending on the amount of cement paste contained in raw aggregates, and are mixed with ascone, tiles, red bricks, vinyls, metals, and the like. It is. As mentioned above, the quality standards of the aggregates for the landfill and road auxiliary layers, which are the main uses of recycled aggregates, are 1% or less of foreign matter content and particle size of 100mm or less. Based on this standard, the present recycled aggregate production system satisfies the foreign matter content, but this is due to the separation of waste vinyl, metals, etc., and the separation of tiles, bricks, etc. in the recycled aggregate is not made. Therefore, the separation of foreign materials other than aggregate is considered to be possible to produce recycled aggregate of higher quality than current recycled aggregate at low cost if proper screening technology is applied considering each characteristic. In particular, it is judged that the throughput and reduction of the throughput can be improved even in the production of high-quality recycled aggregate by the separation technology of the paste attached to the recycled aggregate.

Meanwhile, in the road pavement method, as illustrated in FIG. 1, an auxiliary base layer 2 is formed of gravel or soil-cement on the roadbed 1, and soil-cement or ascon is laid on the auxiliary base layer 2 to form a substrate. After forming (3), it is common to form asphalt or concrete to form the surface layer (4). So-called soil-cement base paving method.

However, due to the depletion of resources such as soil constituting the road auxiliary layer according to the prior art, there is an urgent need for alternative resources for forming an auxiliary base layer.

The present invention is to solve the above-mentioned conventional problems, by processing various wastes such as recycled aggregates can be used for the road auxiliary layer material road to reduce the manufacturing cost of the road auxiliary layer material and the associated costs for the treatment of waste. The purpose of the present invention is to provide a method for screening recycled aggregate for auxiliary base material and a road auxiliary base material using the selected recycled aggregate.

The recycled aggregate sorting method for the road auxiliary layer material according to the present invention for achieving the above object is characterized in that the recycled aggregate of the particle size of 50mm or less through the two crushing process and the sorting process for the construction waste.

In addition, the road auxiliary layer material using the recycled aggregate according to the present invention, other business wastes such as recycled aggregate, purified sludge, waste foundry sand and stone powder sludge (slag, basin, ceramic chips, waste gypsum, waste refractory, waste stone, waste ready-mixed concrete, inorganic) One or more of the sludge is mixed).

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to

Road auxiliary base material using recycled aggregate according to the present invention, 60 to 72% by weight of construction waste recycled aggregate, 5 to 10% by weight purified sludge, 13 to 20% by weight of waste foundry sand, other workplace waste (stone powder sludge) , Slag, basin, ceramic chips, waste gypsum, waste refractory, waste stone, one or more of the mixed ready-mixed concrete) 10-15% by weight. In other words, the stone powder sludge is to satisfy the particle size distribution of the road auxiliary layer material, one or more of slag, basin, ceramic chips, waste gypsum, waste refractories, waste stone, waste concrete can be replaced with a mixture.

Here, the recycled aggregate is a main raw material of the road auxiliary layer material, and waste can be recycled to achieve high added value. The method of selecting recycled aggregate for road auxiliary layer material according to the present invention will be described in detail below.

Water purification sludge, waste foundry sand, stone powder sludge, etc. are used to satisfy the particle size distribution criteria of the road auxiliary layer material.

Hereinafter, the components constituting the road auxiliary layer material using the recycled aggregate according to the present invention will be described in detail.

1. Recycled aggregate

end. General nature.

Recycled aggregates may be contaminated with organic impurities or other foreign substances, and they are mixed and used as aggregates in various mountain regions. By the way, the auxiliary base material should be solid and durable. Therefore, construction waste such as waste concrete should not contain organic impurities or other harmful substances. Construction wastes should be free from such conditions as impurities, odors, odors, and permeated water may be separated from the surrounding environment or work, depending on the collection location. Depending on the organic impurity content after crushing, there is a possibility of environmental problems caused by the auxiliary base layer, so appropriate tests can be carried out to check for harmful substances in the infiltration water or materials.

The road auxiliary layer material according to the present invention is largely produced through a two-step process.

First, the first step is to produce recycled aggregate of less than 50mm by crushing and screening waste concrete. During the concrete crushing and sorting process of the waste concrete generated at the construction site, the waste concrete is removed from the regenerated aggregates of 50mm or less in size.

The recycled aggregate that has undergone the first stage process is inadequate due to the insufficient amount of fines and sand with respect to the particle size distribution criteria of the road auxiliary layer. Therefore, in the two-stage process, other recyclable workplace wastes (mineral, basin, ceramic chips, waste gypsum, waste refractories, waste stone, waste concrete, etc.) are mixed by mixing inorganic purified sludge, waste foundry sand, stone powder sludge, etc. It is a step of producing road auxiliary strata materials that meet the granularity criteria.

The road auxiliary base material according to the present invention, which has undergone a two-step process, satisfies the standards required by the standard specification of road construction, and its detailed description will be described in the following physical properties.

I. Physical properties.

The auxiliary base distributes traffic loads safely to the road and prevents the rise of groundwater caused by capillary phenomena, prevents damage by frostbite, prevents partial settlement, and prevents the rise of roadbed.

The road auxiliary base material according to the present invention has a wear loss of 50% or less, a plasticity index of 6 or less, a modified CBR value of 30% or less, in order to satisfy the auxiliary base material required by the road construction standard specification. CBR, which corresponds to compaction degree, refers to the standard material, and CBR value: means the percentage of test load strength against standard load strength.), Sand content is less than 25%.

Generally, materials with a modified CBR of 30 or less can be obtained economically near the construction site. In auxiliary base materials, the plasticity index should be 6 or less, the maximum mouth diameter should be 50mm or less, the wear loss should be 50% or less, and the sand content should be 25 or more.

Auxiliary base materials shall not contain clay lumps, organic dust or other harmful substances as solid and durable cinders, gravel, sand, slag, other supervisory approved materials, or mixtures thereof.

The road auxiliary base material according to the present invention uses the waste material of the construction structure, and the material produced by the grinder is used to meet the specifications. Materials with a plasticity index greater than 6 are generally sensitive to changes in water content due to the fine particles, which may lead to a decrease in bearing capacity or the East Sea. The plasticity index regulations are strictly adhered to, because of the direct damage caused by repeated traffic loads. Should be.

As a result of analyzing the experimental and research data, the recycled aggregate produced from waste concrete is worn out according to the quality standard which is defined as auxiliary base material for natural aggregate in the road construction standard specification and the construction waste treatment and recycling method of the Ministry of Construction and Transportation. The weight loss, plasticity index, CBR value, and sand content were used to define the recycled aggregate for roadside substratum.

division Test Methods standard Wear loss (%) KS F 2508 50 or less Plasticity index (%) KS F 2304 6 or less Corrected CBR Value (%) KS F 2320 30 or less Sand content KS F 2340 25 or less

. Modified CBR value: A material that indicates the quality standards of subbase material or fill material.

. CBR value: Percentage of test load strength to standard load strength.

. Firing index: Specification for the test method for testing the firing limit of soil and the calculation method of the firing index.

. Abrasion loss: Friction is applied to the aggregate in the rotating drum and the wear resistance of the aggregate is determined by measuring the amount of wear loss of the aggregate at the rotational speed of firing.

All. Granularity.

For sifting, the sieve dimensions are to be as specified in KS A 5101. The standard granularity of recycled aggregate for road auxiliary base material follows the particle size of road auxiliary base material specified for general aggregate in the standard specification of road construction. Since waste concrete has different particle size distribution during crushing depending on the sand strength, the particle size distribution by crushing may be within the standard particle size range. The test should be carried out and taken immediately. If the waste concrete cannot form a continuous particle size distribution due to lack of fine particles that can act as a filling material due to the high strength of the waste concrete, it can be used to make the auxiliary base material specification reasonable by adding sand or other non-plastic material. have.

. Particle size is suitable up to 50mm or less

. Here, the sieves correspond to the standard meshes 75 mm, 53 mm, 37.5 mm, 20 mm, 4.75 mm, 2.5 mm, 425 μm and 75 μm specified in KSA5101, respectively.

Definition of SB-1 and SB-2: Standards for Distribution of Particle Size

la. Water content.

The auxiliary base material is preferably compacted at an optimum function ratio. Since waste concrete contains a lot of granular materials and cement powder, the water content is insensitive, so the relationship between the maximum dry density and the optimum function ratio does not appear clearly when compacting, so the water compaction effect can be expected if the range of the optimum function ratio is wide. However, since the roadbed material is sensitive to the water content, if the water content of the auxiliary base is excessive, adverse conditions are formed on the road surface, so that the water content is controlled within the range that does not adversely affect the road surface (the adjustment of the water content is not limited to numerical values). A commitment must be made.

The recycled aggregate applied to the road auxiliary layer material according to the present invention can not be used for the road auxiliary layer material alone because the fine particles of 0.4mm or less are discharged together with water in the washing process and the fine particles are insufficient to be used for the road auxiliary layer. In the present invention, in order to replenish the fine powder, an appropriate amount of inorganic purified sludge (sand sludge, purified sludge, etc.) and clay caking waste foundry sand are mixed. That is, the present invention is characterized in that the recycled aggregate produced so far can be used for the road auxiliary layer.

In addition, in order to recycle recyclable workplace wastes (as set out in Annex 11-2 of the Waste Management Act Enforcement Regulations), they can be mixed at an appropriate ratio to produce high quality road auxiliary layer materials.

end. Particle size distribution of recycled aggregates used as road auxiliary foundation materials recycled crushed construction wastes according to the prior art (before size control).

I. Particle size distribution of the road auxiliary layer material adjusted to the particle size according to the present invention.

As can be seen from the above table, the particle size of the road assistance base material according to the present invention satisfies both the indicators of the particle size.

As described above, the recycled aggregate applied to the road auxiliary layer material according to the present invention satisfies the particle size standard, but when the waste concrete is crushed, the recycled aggregate produced by crushing the recycled aggregates can play a role as a filler. The amount of fine powder below 0.4mm and 0.08mm is insufficient. Particularly, when the wet intermediate treatment equipment is in operation, the fine powder is lost during the washing process and thus the particle size is not met. Therefore, it is to synthesize the inorganic purified sludge, waste foundry sand and the like so that the quality of the recycled aggregate meets the criteria of the road auxiliary layer material.

2. Integer.

General characteristics of the purified sludge are as follows.

Moisture content, loss of ignition, organic content (600C)

-Water content; 76.9%

-Loss on ignition: 77.7%

Organic matter content: 3.6%

The chemical composition of the purified sludge has a high content of SiO ₂ and Al ₂ O ₃ , and thus has a suitable composition as a cement raw material source. However, since the water content is 70% or more, it is not suitable for use as a road auxiliary layer material, and according to the present invention, there is a feature of pretreating the inorganic purified sludge to be used as a road auxiliary layer material.

Specifically, purified sludge is a residue of suspended or suspended suspended solids in the sedimentation and backwashing process, which is a water purification process.Because the water content is high, it is inconvenient for landfilling, so briquettes or masato are mixed and brought into the landfill. .

Analysis of the characteristics of the purified sludge showed that the pH was 6.7-7.2, the water content was 65-75%, and the ignition loss was 4.2-9.8%. The Al ₂ O ₃ content is 30-55%, and the water purification sludge cake in Seoul has a low organic matter content and high Al ₂ O ₃ and SiO ₂ content, so recycling methods such as incineration and composting are not appropriate. It was judged. In a practical recycling scheme proposed in the present invention, the purified sludge is naturally dried to lower the water content to 70% or less.

3. Waste Foundry Sand

The waste foundry sand is generated in the foundry for manufacturing automobiles, ships, trains, etc., and about 480,000 tons of waste foundry sand are generated annually in Korea. These waste founders rely mainly on landfills, and only a very small amount of recycled materials are recycled. The recycling method of waste foundry sand can be thought of as a new way of recycling and the recycling of waste foundry sand for other purposes. It is a method used as a material, and in this process, technology development for recycling waste foundry sand to concrete material was carried out. Physical and chemical properties and particle size distribution experiments were carried out through various foundry sands. The physical properties of waste foundry sands were similar to those of concrete sand. These results were similar to those of the US, Japan, and other countries. The replacement of waste found sand up to 40% with respect to general remnant bone (sand) did not show any deterioration in mechanical properties, and the results showed satisfactory results in experiments using fly ash cement substitution rate of 10-20%. In mortar tests and actual production tests, cement bricks and blocks can be used up to 100% of ordinary sand. In the present invention, to satisfy the particle size distribution criteria, a particle size of 2.0 mm or less is used.

3. Seokbun Sludge

Crushed sand (crushed sand, sand) is a reprocessed stone powder (about 30% of the raw stone) produced in the process of producing cracked gravel by inserting the raw stone into the aggregate crushing plant. This process produces about 15% of the sludge. The sludge sludge is currently regulated as general waste at the workplace, and can not be stored for more than 90 days, and can be used for a limited amount as a construction material or base material by mixing more than 50% of general soil and recycled soil. However, the processing procedure is complicated and the cost is mostly kept as it is.

Chemical Composition of Sludge Sludge

A road aid layer material with a good particle size distribution is almost evenly changed from large particles to small particles. The use of road aid base material with good particle size distribution improves the overall physical properties such as compaction, thus improving the ability to distribute the traffic loads transmitted through the surface and the ground to the road.

Therefore, it is to supplement the shortage with waste casting sand of 2mm or less and inorganic purified sludge less than 0.4mm that construction waste recycling aggregate alone is insufficient.

The road auxiliary base material using the recycled aggregate according to the present invention configured as described above has shown the results as shown in the following table.

Test results of road auxiliary layer material using recycled aggregate according to the present invention.

Test organization: Korea Institute of Construction Materials

Reception Number: Incheon 06-7355 (Gun-216)

Sample Name: Road Auxiliary Floor Materials

Date of Receipt: 2006.6.26

Test start date: 2006.06.27

Test End Date: 2006.07.12

Sample composition

Through the table, it can be seen that the road auxiliary base material using the recycled aggregate according to the present invention satisfies the standard of the road construction standard specification.

The method of manufacturing the road auxiliary layer material using the recycled aggregate according to the present invention is a method for producing recycled aggregates and other additives (sewage sludge, waste foundry sand, stone powder sludge), and the road auxiliary layer material using the recycled aggregates and additives prepared by the production method. It is divided into manufacturing methods.

The method for sorting recycled aggregate for road auxiliary layer material according to the present invention is as follows.

Since waste concrete is obtained by crushing existing concrete, it is required to go through several stages of crushing and sorting in order to be used as an auxiliary base material (see FIG. 2).

(S10) Waste concrete mass input. In this step, a relatively large mass of concrete (for example, 500 mm or less) generated when breaking an insoluble structure is introduced into a hopper.

(S20) sediment sorting. By supplying the waste concrete to the hopper to the vibrating screen to apply the vibration to the waste concrete to remove the soil deposited on the surface of the waste concrete.

(S30) Foreign matter screening. Reinforced concrete, combustible foreign substances, etc. may be mixed in the waste concrete selected by earth and sand, and the rebar and combustible wastes (waste vinyl, waste clothing, etc.) are sorted out by a worker's manual and magnetic separator. Specifically, the waste concrete is transferred through a conveying means such as a conveyor, and the worker directly selects and removes the flammable waste contained in the waste concrete conveyed along the conveyor, and further, on the conveyor to which the waste concrete is conveyed. Magnetic separator is installed to adsorb and remove the reinforcing bars contained in the waste concrete by the magnetic force. The magnetic separator may be a crawler type conveyor in which a plurality of magnets are installed, which is known before the present invention.

(S40) 1st shredding. Waste concrete from which soil and various foreign substances have been removed is put into a crusher (eg jaw crusher) and crushed first to 200 mm or less.

(S50) Differential Screening. The finely crushed waste concrete, which is primarily crushed through the crusher, is generated when crushed, and freely falls the waste concrete through the crusher, thereby removing the fine powder by applying wind power to the waste concrete during the fall.

(S60) washing and dehydration. Waste concrete from which flammable foreign substances have been removed is put in a washing water tank to remove fine foreign substances, and dehydrated by passing the washed waste concrete through a dehydration screen. When the waste concrete is introduced into the tank, fine foreign matters on the surface of the waste concrete are washed out by the washing water in the tank. A transfer conveyor is installed inside the tank, and waste concrete from which fine foreign substances have been washed out in the tank is discharged to the outside of the tank via the transfer conveyor and supplied to the dewatering screen. The dewatering screen has a plate shape having a plurality of drainage holes and vibrates from a conventional vibration motor to vibrate the waste concrete supplied from the water tank to remove water from the surface of the waste concrete.

(S70) secondary shredding. The washed and dehydrated waste concrete is put into a secondary crusher and crushed to a particle size of 150 mm or less.

(S80) Screening. By supplying the second crushed waste concrete to the vibrating separator and applying vibration to the waste concrete, the recycled aggregate for road auxiliary layer material with a particle size of 50 mm or less is selected, and in this process, a magnetic separator is installed on the vibrating separator to reinforce by magnetic force. Screening. The magnetic separator is an endless track conveyor having a magnet installed thereon, which is installed on the vibration separator to remove and reinforce the reinforcement of the waste concrete supplied to the vibration separator by magnetic force, which is not novel by the present invention and is already known. It is.

(S90) 3rd shredding. Waste concrete of 50mm or more that has been sorted is crushed to 50mm or less and supplied to the vibrating separator of the sorting process.

Through the process of the above (S10) ~ (S90) to produce a recycled aggregate for road auxiliary layer material using the recycled aggregate according to the present invention.

Purified sludge, waste foundry sand, and stone sludge are not described here because they have been described in the above description of physical properties.

Using the recycled aggregate, purified sludge, waste foundry sand, stone powder sludge produced by the above process as a material to prepare a road auxiliary layer material using the recycled aggregate according to the present invention, the process consists of material mixing and sorting.

That is, recycled aggregate, purified sludge, stone sludge, and waste foundry sand are prepared respectively, mixed with a fixed amount into a mixer, and then rebars, fine powder or foreign matter contained in the mixture are sorted by hand, screen, or magnetic separator.

As described above, according to the method of screening the recycled aggregates for road auxiliary layer material according to the present invention and the road auxiliary layer material using the recycled aggregates selected by the present invention, the recycled aggregate recycled from the construction waste can be used as the road auxiliary layer material. In particular, various additives for using recycled aggregates for road auxiliary layers can also increase added value by using recycled products, and can significantly reduce the amount of abandoned aggregates, landfills, etc., for the treatment of unused recycled aggregates. There is an effect such as to reduce the accompanying costs.

While the invention has been described and illustrated in connection with a preferred embodiment for illustrating the principles of the invention, the invention is not limited to the configuration and operation as such is shown and described. Rather, it will be apparent to those skilled in the art that many changes and modifications to the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (3)

Injecting less than 500 mm of waste concrete into the hopper; Supplying the waste concrete to the hopper to a vibrating screen to sort the soil deposited on the surface of the waste concrete; Sorting the reinforcing bars and combustible wastes mixed in the waste concrete; Crushing the waste concrete from which the soil and various foreign matters are removed to less than 200 mm through the sorting steps; Removing combustible foreign matter by applying wind power to the crushed waste concrete; Washing the waste concrete from which foreign matters are removed through the above steps, and dehydrating after removing fine foreign matters; Crushing the washed waste concrete to a particle size of 150 mm or less; Selecting a recycled aggregate of 50 mm or less for road auxiliary layer material from the secondary crushed waste concrete; The method for sorting recycled aggregates for road auxiliary layer material comprising the step of crushing the waste concrete of 50mm or more of the selected waste concrete to 50mm or less. 60 to 72% by weight recycled aggregate of 50 mm or less particle size selected by the above 1, 5 to 10% by weight of inorganic purified sludge less than 0.4mm, and 13 to 20% by weight of 2.0mm or less of the total 100% by weight. %, 4.0 mm or less stone powder sludge 10-15% by weight of the road auxiliary layer using recycled aggregates, characterized in that the mixture is made. The method according to claim 2, wherein the stone sludge, A road auxiliary sublayer using recycled aggregate, characterized in that one or more of slag, basin, ceramic chips, waste gypsum, waste refractory, waste stone, and waste concrete are replaced by a mixture.

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