Processing of asphalt crumb. Asphalt crumb with delivery. Why such a cheap cost of asphalt crumb

One of the most common recycled materials is crushed asphalt, also known as asphalt granulate, which is used in a wide range of construction and repair jobs.

This material is obtained by grinding the old asphalt pavement, removed during the replacement or repair of the roadway, by cold milling. Thus, asphalt crumb consists of particles of bitumen and small gravel from three to five millimeters in diameter, in addition, it may contain traces of sand or other elements.

The use of asphalt

Due to the inexpensive price, ease of operation, and the fact that the crumb as a product obtained by processing causes relatively less harm to the environment, the range of its application is extremely wide and includes almost all spheres of human economic activity:

Due to the wide use of this material, as well as the presence of many other options on the market, consumers, in an attempt to find the most suitable option for themselves, often ask how much a cube of asphalt chips costs. Below, in the thesis form, the main reference characteristics of this material are given, including answers to such questions as how much 1 cube of asphalt crumb weighs and how many cubes fit in a KAMAZ or dump truck.

• The average price of asphalt chips in Moscow is $12-14, in the regions it starts from $10;
• 1 cube of asphalt chips can weigh from 1500 to 1900 kilograms, depending on its composition;
• Accordingly, about 12 cubic meters will fit in the body of an average KAMAZ;

The crumb consumption per m 2 with a layer thickness of 20 centimeters is approximately 400-600 kilograms.

Laying technology

1. First of all, the base for the asphalt crumb is prepared. The area is leveled, large debris is removed: cobblestones and scrap metal. This item may well be skipped if the condition of the terrain is acceptable for the purpose.
2. The surface is variably primed using a bitumen emulsion of asphalt chips for better adhesion in the future. Its consumption is about one liter per sq.m.;
3. Laying out crumbs on the surface, compacting the laid out layer. This can be done both with specialized equipment and independently. It is worth remembering that the compaction coefficient of asphalt chips, depending on the composition, reaches a value of 2 units, which means that during rolling, the thickness can decrease up to two times and be sure to include this factor in the calculations!
4. Impregnation of bitumen emulsion of asphalt crumb. This will further strengthen it and increase its service life. Consumption is about 0.5 liters per m 2.

Do-it-yourself asphalt crumb laying is not too different from the technology described above. The only difference is that you will have to lay it out yourself with the help of shovels, and roll it with cars. Difficulties may arise with how to melt asphalt chips: without the use of technology, this is not only laborious, but also flammable. You can melt the crumb open fire V metal container sufficient size. Be sure to have a fire extinguisher with you to extinguish a possible fire!

Pros and cons of using asphalt chips

To begin with, let's mention the environmental aspect of the use of asphalt chips. Many people, from among those who will ennoble country cottage area, having children and animals in the family, is interested in whether asphalt chips are harmful. Despite the fact that it contains bitumen - a product of oil refining, which, accordingly, causes more harm to the environment than good, the use of crumbs in the economy is more environmentally friendly than in the case of asphalt of the same volumes.

According to the documentation, asphalt crumb has a hazard class 4, along with household waste, such as old clothes and shoes.

1. A wide range of applications, covering most of the areas of human economic activity;
2. Affordable price, which favorably distinguishes asphalt crumb against the background of crushed stone or gravel and, due to similar properties, has recommended the crumb as a suitable replacement for them;
3. Long service life when used in suitable conditions for this: minor roads and paths of short length and sports complexes;
4. Ease of installation. For this, it is not necessary to prepare the surface in advance, and the rolling of asphalt chips does not imply the mandatory participation of special equipment; in order to save money, it can be done with the help of passing cars;
5. High resistance to adverse weather conditions.

Disadvantages of asphalt crumb, like any other material, exist:

1. More harmful effect on environment compared to gravel or sand;
2. The need for periodic updating of the canvas.

However, all the shortcomings are fully covered by its numerous positive qualities.

Alternatives

In addition, consumers often ask the question: which is better, asphalt chips or crushed stone? There is no single answer to it, since these materials, including sand and broken brick and concrete, usually perform the same functions. But the price of crumbs is lower, and crushed stone has a less harmful effect due to the absence of bitumen in the composition. So it is necessary to make a choice based on circumstances and personal preferences.

Summing up

Thus, asphalt crumb will be an ideal option for you if you value simplicity and convenience in laying and prefer to spend extra money on yourself and your loved ones, rather than on building materials. Whether in a parking lot or driveway, sports field or garage floor, this material will meet your every need!

Transport infrastructure is one of critical systems any state. With its help, goods are exchanged between cities. This is how the products most likely arrived at your nearest store. Therefore, keeping the road in the best possible condition is necessary to meet all transport needs.

The first builders of roads under the understanding that we know today were the Romans. During the time of the Roman Empire, they were concerned about the need to build trade routes to their capital from all over the empire. There is a saying that confirms this: "All roads lead to Rome." This can be seen on the historical map.

It is worth noting that they approached this issue thoroughly, even after thousands of years there are well-preserved sections of it. We need to thank the designers who pointed out the need to create a strong foundation. It provided reliability for ages. From above, either smooth slabs or a scattering of small stones were usually placed.

In our time, the process of building roads has become more technologically advanced. This is done both to give a smooth surface and increase the life of the blade. Engineers calculate all the factors that affect the service life. This must be taken into account, since serious loads act on the road surface around the clock. In summer high temperatures they simply “melt” the asphalt, as a result of which a track from the wheels appears. During the first frosts, the water that penetrated the cracks freezes and turns into ice, and, as is known from school course Physics ice has a larger volume than water. Therefore, the water literally tears the road apart. Another advantage of modern roads is the speed of repair. A defective place can be repaired in just one hour.

The process of sorting asphalt concrete scrap

During the repair work with the replacement of the roadway, asphalt concrete waste of various sizes is formed. This sometimes complicates the recycling process, since not all construction machines able to grind large blocks of asphalt. For this, a conditional classification of sizes was invented. It is called conditional due to the fact that in GOST there is no column with an exact indication of the values. There are usually three groups of pieces of recycled asphalt:

• Small fragments - up to 150mm;
• Medium debris - up to 400mm;
• Large scrap - from 400mm.

Perhaps these conventions were not documented due to the fact that most often the workers themselves have to grind fragments to required size at the site of the repair work.

Natural asphalt is a mixture of bitumen with various minerals.

Recycling and further use of asphalt scrap

The concept of recycling asphalt scrap implies only its processing. The material is very durable, it has no limit on the number of reuses. Therefore, simply throwing old asphalt into a landfill will not be the most rational solution.

Use in construction

Asphalt scrap is a fairly versatile material in construction. With it, you can strengthen roads that do not have a hard surface or simply fill in holes.

Much more right decision there will be a reuse of the old material in the laying of a fresh roadbed. To achieve this goal, a special installation called a recycler is used, inside which asphalt is processed. More specifically, it heats the mixture and mixes it until it is homogeneous. Approximately, as a concrete mixer. To achieve the highest quality product, it is necessary to strictly observe the temperature regime. Externally, the installation has an unremarkable appearance: a barrel painted in Orange color, which is installed on the chassis from the trailer. There are many models of such stations, up to self-propelled ones, but the type described is the most common. This allows it to be mobile enough that it can be used in the narrow streets of the city.

Prices for asphalt concrete scrap

Asphalt production waste has a fairly low cost in the construction market. For example, one ton of raw waste will cost only 200 rubles. By this is meant only the removed lumpy asphalt, usually large. Asphalt crumb It costs an order of magnitude more expensive, about 1000 rubles. This is logical, since it is already a full-fledged repair and construction material.

There is also the concept of asphalt granulate, it differs from crumbs in more thorough preparation in the form of crushing, as well as screening in specialized installations. All information is prescribed in detail by GOST R55052-2012.

Keep in mind that the supplier may vary the price of granulate, both up and down, depending on such factors:

• seasonality;
• Volumes of purchased material;
• The quality of the product provided.

Another cost line is the transportation of freshly acquired material to the place of work. This fact once again proves the wisdom of recycling old asphalt into new one.

Conclusion

Thus, we found out the importance of recycling and reuse of waste. Especially if this process is quite simple and does not require the infusion of a large amount Money. We can only hope that in the near future this practice will be extended to other industries.

In the field of repair and reconstruction of the roadway, the effectiveness of the use of secondary asphalt concrete. Due to the content of bitumen, stone, plasticizers in such material, asphalt regeneration is expedient not only from an economic, but also from a technical point of view. Additionally, such an event saves energy and resources. Secondary materials attracted the attention of builders because the cost of the bitumen and mineral components used in them is quite high.

Stages of application of asphalt concrete:

• specialized equipment removes the worn layer from the base;
• transportation of the obtained material to the asphalt concrete plant;
• heating the secondary product, in some cases it is mixed with a fresh portion of bitumen or other raw materials.

This process can take place not only in the conditions of a stationary technical base of the plant, but also when using mobile equipment. The described process of hot processing of recycled materials is not the only one, it is also widely used. cold way. To do this, at the factory, individual pieces or other material obtained after milling the roadway are carefully crushed and mixed with fresh emulsion. The resulting material is used to create roads with a low level of congestion, for example in villages.

In our country, it is hot processing that is widely used, which is carried out using equipment from various foreign manufacturers. Such batch plants are often produced mobile, which reduces the cost of resources and time, excluding the participation of the plant from the process.

ABZ "Bernardi" with a system

asphalt recycling

Particularly noteworthy is the Italian company BERNARDI, which creates state-of-the-art recycling facilities. With the help of its advanced dryer, it is possible to regenerate up to half of the worn mixture. At the same time, costs remain very low. The technology used in this unit is called "RED" and over the years of use has proven itself to be one of the best.

Another technology is used by the Chinese brand D&G Machinery. This company uses time-tested classical technologies for the regeneration of waste road construction materials. All installations produced by the brand can be divided into two main categories. The first is equipment with a parallel drying element, which guarantees the processing of a large percentage of recyclable materials (50% or more). This technique requires a significant investment. The second option is a recycling ring, which is an order of magnitude cheaper, but it can be used to recycle no more than 35% (usually even less) of asphalt concrete.

Before loading into such units, the raw material is crushed in impact rotary, jaw or cone units (more details). To simplify the task of grinding high-strength material and speed up this operation, it is saturated with water. It is preferable to carry out crushing in a cold or moderately warm environment, the temperature of which does not exceed 15 degrees Celsius. If we are not talking about lumpy material, but obtained by milling, it is not necessary to grind it - just add it to fresh, thoroughly dried mineral raw materials in a special drum.

Technologically, the asphalt recovery process proceeds as follows:

• fresh mineral base is dosed and placed in a drum-type heater;
• old materials are loaded into the same container: asphalt dust, bitumen fragments, crushed lumpy raw materials;
• all this is heated to strictly defined temperatures (to avoid the rapid aging of the mixture) and mixed with a fresh portion of bitumen or plasticizer;
• after preparation of the mixture, it is unloaded into a skip-type lifting device, transported to the bunker of finished materials.

The installation is controlled by a trained operator at all stages of the restoration of the building mix. In addition to the heater, the same equipment is involved in this process as for other types of asphalt concrete complexes. This makes it easy to set up the process of regeneration of asphalt concrete.

Sale asphalt crumb from 500 rub. for 1 m3. Asphalt, otherwise asphalt crumb, is a loose material for the road, similar to crushed stone, which is cheap, after compaction it looks like asphalt. According to its characteristics, asphalt crumb is even superior to other materials somewhere, as it is perfectly rolled and compacted by a roller.

Asphalt crumb is obtained as a result of a cut of old asphalt from the road. The use of asphalt crumbs is very diverse: to equip a drive - an exit to a house or a plot, to raise and lay out a road from crumbs in the country, for laying and backfilling roads in SNT, territory, parking for a car. You can buy asphalt crumb in Moscow, the Moscow region both with delivery and with laying, possibly for self-delivery: for giving, parking, paths in the country, roads, garages, leveling the road, filling driveways and the street. To order delivery, please contact our company "RossDor" - you can buy fresh crumbs from under the cutter in the morning or at night of your choice.

Asphalt crumb price

Prices for asphalt crumb 500 rubles per cubic meter. The cost of delivery is estimated by the number of cubes and the distance to the place of unloading in Moscow, Moscow region. Buy asphalt crumb in the RossDor company with delivery to Moscow and the Moscow region at a low price: Ramensky district of Bronnitsy Ramenskoye Bykovo Zhukovsky Schelkovo Schelkovsky district, Balashikha Balashikha district in Ramenskoye, Domodedovo Domodedovo district Vidnoe, Mytishchi in Mytishchi district Korolev, Podolsky Podolsk district Klimovsk Shcherbinka, Krasnogorsk Istrinsky, Krasnogorsk district Dedovsk Istra Zvenigorod. Asphalt crumb with delivery in Odintsovo Odintsovo district Golitsyno, Narofominsk district, Noginsky Noginsk Kupavna Elektrougli Malakhovka Luberetsky district Lyubertsy Konstantinovo Lytkarino in Bronnitsy, Stupinsky district Mikhnevo Stupino, Voskresensky district Voskresensk, New Moscow Vnukovo Aprelevka Troitsk, Solntsevo, Leninsky district, Moskovsky, Khimki Zelenograd, Dolgoprudny Lobnya Pushkino Pushkinsky district, Yubileyny, Fryazino Ivanteevka Losino-Petrovsky, Barybino, Zheleznodorozhny Gorki Leninskie, Serpukhov Serpukhov district Solnechnogorsk district Solnechnogorsk, Dmitrov Dmitrovsky district Sheremetyevo. Asphalt crumb buy in Moscow - the center of Cao Yuao Sao Vao Zao Yuzao Svao Yuvao Szao, New Moscow.

For durability and strengthening of the crumb coating, after laying, we recommend shedding, treating with a bituminous emulsion, such impregnation will strengthen the surface and increase the service life.

To order asphalt crumb, fill out the order form on the website or call us. We work with individuals, individuals and legal entities.

The cost of laying services is calculated individually based on the layer of laying and the area of ​​the road.

Departure of our specialist to calculate the volume and cost of work - FREE OF CHARGE!

Asphalt crumb price for 2019

The asphalt concrete pavement of the autobahn is constantly exposed to mechanical loads from.

In addition, it is influenced by weather conditions and soil and hydrological factors.

Internal stress and strain roadway caused by these impacts, accumulate, which leads to the appearance of defects and destruction of the upper layer of the pavement in the form of cracks and potholes.

To ensure that the quality of the roadway meets safety requirements traffic(art. 12 federal law dated December 10, 1995 No. 196-FZ as amended on July 26, 2017 "On Road Safety"), road construction organizations are removal of worn and damaged layers asphalt concrete pavement(ABP) and replacing them with new layers.

Volumes of annually removed old UPS in each major city RF amount to tens of thousands of tons, and in general, for Russian highways, it annually "overruns" over a million tons dismantled asphalt concrete.

Modern technologies for processing old asphalt concrete are resource-saving in nature, since the regenerated coating is successfully used in the process of creating a new ABP.

The regeneration of the dismantled ABP is aimed at restoring and improving the technical and operational characteristics of the asphalt concrete material in order to reuse it for asphalting autobahns or other road repair work.

After the expiration of the service life of the pavement in its composition up to 90% of useful weight is saved asphalt concrete material suitable for further use.

To make the methods of processing used asphalt more understandable, let's take a closer look at the structure of the pavement and the properties of the main elements that make it up.

Road pavements with ABP are the most common designs of autobahns of all categories.

Above is scheme of the so-called "road pie"- multi-layer pavement with a mandatory asphalt concrete pavement with a thickness of at least 15 cm.

GOST 9128-2013“Asphalt concrete mixes…” defines the composition of asphalt concrete mixtures (clause 3.1) as rationally selected mixtures of crushed stone, gravel, sand and mineral powder with bitumen, mixed in a heated state. At the same time, it is customary to call asphalt concrete (clause 3.2) an asphalt concrete mixture (hereinafter referred to as ABS) in a compacted state after rolling with rollers.

It is necessary to distinguish between concepts asphalt and asphalt concrete used in road construction practice:

1. Asphalt is astringent organic matter natural or artificial origin with different content of bitumen in its composition(from 13% to 75%). It is a mixture of bitumen with sand and gravel. Real natural asphalt consists of heavy oil fractions and is little different from ordinary tar, for which the ancient Greeks called it mountain tar.
2. Asphalt concrete - the result of technological mixing of bitumen with inert materials - crushed stone, gravel and sand, which significantly increase the strength characteristics of the asphalt concrete mixture. In other words, asphalt concrete is a modified version of traditional asphalt pavement.

As part of the ABP, bitumen is only 4.5-6.0%, the rest is crushed stone, gravel and sand.

This gave rise to half a century ago on the basis of extensive research in the USA, the USSR, European countries and China to adopt the concept of 100% suitability road asphalt concrete pavement for recycling and reuse.

Modern technologies for the regeneration and recycling of asphalt concrete pavements represent the processing of ABP worn out during operation, bringing its technical indicators and physical and chemical characteristics to the required level.

The use of dismantled old asphalt concrete allows you to do this with minimal consumption of new binders and inert fillers.

Removing end-of-life material

A kind of starting point for starting the processing of old asphalt concrete is the dismantling of the asphalt concrete canvas.

It is carried out taking into account the state of the canvas layer, the type of coating and a number of other factors.

asphalt pavement removed by layer-by-layer removal of material of the worn-out roadway, while dismantling either over the entire thickness of the road surface, or only the material of local damaged areas is removed.

On small areas still use manual ways opening and removing asphalt using tools such as:

• impact pneumatic tools;
• cutting installations;
• crowbars;
• kylo;
• sledgehammers;
• picks.

On large areas Removing the UPS without specialized equipment is no longer enough. Brigades with jackhammers and shovels were replaced by mini excavators with hydraulic breakers.

Serious competition to traditional methods of removing the roadway is presented by modern road milling cutters, equipped with rotating milling drums to cut through the old asphalt concrete to the required depth.

The width of the cut lane on the road when the coating is removed depends on the width of the drum and varies from 350 mm to 2200 mm.

The steel teeth of the drums cut off the required layer of ABP and cut shallow grooves on the base of the pavement to improve the adhesion of the remaining base material to the new layer of asphalt concrete mixture or reclaimed asphalt concrete.

Layer milling The roadbed is performed in two different ways:

• hot milling, carried out under the conditions of preheating of the ABP;
• cold milling, in which work begins without warming up.

Each milling method has its advantages and disadvantages.

Hot milling

This method for removing ABP was introduced before cold milling was introduced.

With the help of mobile infrared burners running on gas (propane-butane mixture) or on kerosene, asphalt warms up and softens.

This helps to reduce the amount of effort that must be expended to destroy the dismantled coating.

disadvantages hot milling are the following circumstances:

• high cost of used fuel resources;
• the risk of fire of equipment and the risk of burns to personnel;
• the destroyed asphalt material sticks together, making it inconvenient to re-use;
• when stored in piles at the asphalt plant warehouse, pieces of milled asphalt cake in hot weather, which forces them to be poured with sand or mineral powder.

When choosing hot milling, the priority motive is repair work speed, because the heated ABP is cut off quickly and with minimal effort.

Summarizing the above, it can be noted that the hot method is costly, but fast.

cold way

Cold milling requires more effort and is more time consuming because the pavement layer is removed in its natural hard state.

Benefits this technique are the following factors:

• the invariability of the coating structure, which makes it possible to use the removed material as part of the prepared asphalt concrete mixture;
• when stored in piles, pieces of milled asphalt concrete do not cake;
• economy of the milling process.

Asphalt scrap and granulate

The dismantling of the old ABP leads to the formation of pieces of asphalt concrete of various sizes, called asphalt concrete scrap.

The composition of such waste - scrap - remains the main components of asphalt and asphalt concrete pavement - crushed stone, sand and bitumen residues.

The thickness of the removed layers is from 5 to 15 cm.

Piece sizes asphalt are not standardized, however, in the practice of separating asphalt blocks usually divided into three conditional groups:

• small waste, the size of which does not exceed 20 cm;
• average scrap with element sizes of 15-40 cm;
• large blocks larger than half a meter.

Asphalt scrap, being in the status of a secondary resource, is an excellent repair and building material. The advantages of asphalt scrap are the following qualities:

• strength to mechanical static and dynamic loads;
• resistance to atmospheric moisture and chemically active substances;
• resistance to sudden temperature changes;
• the possibility of further grinding by crushing with a jackhammer;
• low cost.

The average volumetric weight of asphalt scrap is 1800-2200 kg per 1 m3, while for asphalt concrete this parameter is slightly higher - from 2000 to 2450 kg or, respectively, 2-2.45 tons per 1 m3.

Depending on the crushing method pieces of old asphalt concrete receive asphalt concrete granulate(hereinafter - ABG) and asphalt baby which are in high demand. The average density of ABG is from 2100 to 2200 kg / m3.

Standard STO NOSTROY 2.25.35-2011 “Roads. The construction of pavement bases” defines ABG as crushed old asphalt concrete (clause 3.2), which is allowed to be used in the manufacture of pavements and coatings.

Due to the growing demand for ABG in road repair work introduced GOST R 55052-2012 Granulate of old asphalt concrete. Specifications”, which regulates the requirements for this material by analogy with the European standard for asphalt concrete granulate EN 1310808.

This will raise the bar for the use of ABG as a high-quality material for road pavement.

On the Russian market building materials scrap asphalt price varies between 100-300 rubles / cu. m, while the secondary ABG is offered at a price 500-1500 rub. per ton.

Recycling and regeneration

In the world practice of road construction works on the reconstruction of autobahns, regeneration methods and recycling of used pavement materials, allowing save on the purchase of new building materials.

Quite often, information sources on this topic incorrectly interpret the concepts of regeneration and recycling of asphalt concrete, mixing together the end results of completely different technological concepts in their essence.

Let us clarify the features of these processes associated with their names. The term regeneration is taken from Latin- “regeneratio” means “rebirth, restoration”.

With regard to the reconstruction of highway pavement regeneration means the restoration of their technical and operational qualities:

• continuity,
• traffic,
• accident and safety coefficients, etc.

And for the ABP itself - the restoration of physical and mechanical properties and quality indicators.

Among these properties:

• roughness;
• wear resistance;
• shear resistance;
• crack resistance.

Reuse of the material of the old UPS, experts call English word"recycling", meaning recycling- reuse, return to circulation, rework / processing for useful use.

Recycling of the old pavement can be carried out without regeneration of its properties, for example, in the case of using asphalt scrap granulate to strengthen road shoulders, there is no need to restore the plasticity required by the asphalt concrete mixture when it is reused in the pavement.

ABP recycling algorithm

For the technical implementation of the recycling of old asphalt concrete in order to use it as the top layer of the road surface the following work is being done:

1. Removing the damaged layer coatings by hot or cold milling.
2. Manufacturing of ABG by crushing the layer removed by milling to the size of crushed stone fractions.
3. Heating the granulate in a special oven without an open flame to restore the binding and plastic properties of the old bitumen in the composition of the removed asphalt concrete.
4. Adding a portion of fresh bitumen for adjusting the binding and plastic properties of the asphalt mix in accordance with the recipe.

When carrying out work on the processing of old asphalt, the following requirements must be observed to ensure the quality of the new asphalt concrete pavement:

1. For a new asphalt mix obtained from a recycling process, preliminary design is required its composition, in which the formulation of the new asphalt concrete mixture, the grain composition of the inert components, the viscosity of bitumen and its content in the old asphalt concrete, the processing technology and the type of mixing plant, the amount of old asphalt concrete in the composition of the regenerated mixture are determined.
2. When heating granulate in ovens, it is necessary to observe temperature conditions , preventing the start of evaporation of light fractions from the binder composition and its burnout, which can occur when the flash point of bitumen is exceeded (180-220 degrees C for viscous and 45-110 degrees C for liquid bitumen).

Quantitative indicators for the content of granulate and additives in new asphalt concrete should be determined by laboratory methods in accordance with GOST, TU and other regulatory documents.

Ways to reuse asphalt concrete waste

By venue technological measures of recycling distinguish two ways of processing the removed road construction material:

• regeneration of old asphalt concrete in stationary conditions at an asphalt concrete plant (ABZ), involving the preliminary dismantling of the road surface and sending asphalt concrete scrap to the asphalt concrete plant for processing;
• ABP recycling directly at the site of the canvas reconstruction, involving the re-laying of the pavement using special road equipment - remixers, recyclers, asphalt heaters, etc.

Depending on the heating application asphalt concrete during its processing recycling technology subdivide into two large groups:

1. Hot recycling, which cannot do without heating the old asphalt concrete material to the softening temperature of the old bituminous binder. Heating is used at the stage of ABP dismantling, in the process of restoring the plastic properties of old bitumen and when mixing granulate with fresh components in the manufacture of asphalt concrete mix for laying instead of the removed canvas.
2. Cold processing methods ( cold recycling), during the implementation of which there are no thermal effects on the old material and on the components of the fresh mixture.

The reality of road repair practice is that Most often, a combination of these methods is used..

For example, not so long ago, hot processing of asphalt concrete was identified with work in stationary factory conditions in a territory with a developed industrial infrastructure (warehouses, transport routes for the import of asphalt scrap and the export of prepared asphalt concrete mix, containers with bitumen, etc.).

With the advent of mobile asphalt plants, asphalt processing is carried out directly on the road being repaired, ensuring that all the necessary technological operations inherent in hot recycling are performed.

Cold milling, used in mobile plant cold recycling techniques, has successfully "migrated" to process flows used in stationary asphalt plants.

Instead of warming up crushed pieces of ABP or granules from road milling in mixers mixed with emulsion admixtures or foamed concrete, after which they are considered fit for laying.

As an alternative to the traditional technology for the restoration of ABP according to the formula "milling and re-asphalting" are hot and cold regeneration techniques at the roadworks site.

The first of them uses the regeneration of asphalt concrete at an asphalt concrete plant of a stationary or mobile type, and the second involves loosening the pavement material, processing it on site, improving its properties and laying pavement in the pavement.

The work involved a set of thermal profiling equipment, consisting of an asphalt heater, a hot recycler, also called a thermal profiler, and smooth rolled rollers.

Principles of operation of asphalt concrete plants

Process flow asphalt concrete processing at asphalt concrete plant comprises following steps:

Hot processing at the asphalt plant has the following advantages:

• the possibility of constant quality control of the components of the old UPS;
• regulation of the mixture formulation taking into account the composition of the used granulate;
• the possibility of using up to 80% of the old material without reducing the prescription properties of the fresh asphalt mix.

Of the shortcomings hot processing in stationary conditions, the following factors are noted:

• high costs for the transportation of the dismantled coating;
• high energy consumption of drying and heating components of the asphalt mix;
• the presence of carcinogenic hydrocarbons and mineral dust in smoke emissions.

Features of hot and cold methods at the work site

hot way, also called thermal profiling of asphalt, is carried out directly at the repair site roadbed.

For all technologies thermal profiling is characterized by the following operations:

• heating of the upper layer of ABP;
• loosening of the heated layer;
• mixing loosened components;
• re-laying.

Depending on the specific technology of hot recycling, operations for adding bitumen, introducing plasticizers or fresh asphalt concrete mix, etc. can be used at various stages of the technical process.

On-Site Asphalt Concrete Hot Processing Technologies have the following advantages:

• high physical and mechanical properties of reclaimed asphalt concrete;
• ease of use of technology;
• minimal wear of the cutting tool;
• preservation of the existing geometry of the coating;
• the ability to work on one lane without obstructing traffic on the other lane;
• reduction in the cost of repair and installation work;
• increase the service life of the coating;
• reducing the time for repair work by almost two times.

The disadvantages of the "hot" method include:

• environmental problems - when heated, vapors of old bitumen evaporate;
• deterioration of bitumen ductility when the heat treatment temperature is exceeded;
• difficulties in organizing work, since the entire machine complex used in the work must be in “combat” readiness.

Cold recycling works held on site, performed in the following sequence:

Of the merits cold recycling on site note:

• low energy consumption;
• ecological purity of technology;
• maintaining the integrity of the soil, the absence of its deformation;
• high-quality regeneration of the coating.

The disadvantages of this technique are the following:

• high cost of equipment (emulsifiers, etc.);
• the need for a clear organization preparatory work and constant monitoring of the technical condition of the equipment used.

Related videos

Video on the benefits of on-site and small-scale pavement repairs using special equipment for infrared heating and regeneration of used asphalt:

Conclusion

The use of resource-saving technologies for the use of reclaimed old asphalt concrete materials makes it possible to create an adequate replacement for a certain part of the components of the asphalt concrete mixture in compliance with the basic requirements for the quality of road surfaces.

At the same time, it is essential costs are reduced for the purchase of bitumen, energy resources and materials are saved.

In contact with