Soil stabilization technology turns virtually any soil into a solid foundation.

The National Resources company offers soil stabilization services (GOST 23558-94) using inorganic binders. Soil stabilization is effective method creating bases for various coatings.

The company "National Resources" has been working in the field of construction and equipment of the road base for more than 10 years.

Engaged in a full range of construction works pavement and road foundations, as well as industrial and storage sites, by the method of strengthening and stabilizing the soil using various materials.

A guarantee of a well-designed and executed project is the long-term experience of the company - one of our main advantages.

A team of professionals is ready to work in the most difficult weather conditions with almost any type of soil. Thanks to the extensive practical experience and accumulated knowledge base on soil analysis, using modern equipment, the NR company ensures the selection of the optimal composition of the stabilizing mixture, which is a guarantee and guarantee of the quality of the road base for up to 15 years.

Behind the quality of projects, works and materials is close scientific cooperation with specialized institutes in Russia and the CIS countries, which gives us even more confidence both in the technologies used and in their high performance. Each sample of soil and pavement is laboratory tested under specially simulated conditions, which helps to avoid mistakes during road construction.

Reviews of completed orders and professional as well as scientific cooperation, a summary of completed projects and our guarantee provide you with confidence in the construction or repair of roads by the National Resources company.

The company "NR" has efficient and productive equipment to perform a full range of services for road stabilization and recycling.

The company's fleet uses the largest and most productive Wirtgen WR250 recyclers. The capacity of one recycler is 8000 m2 per shift. Compaction depth reaches 560mm.

Fleet of 10 Wirtgen WR250 recyclers. allows you to perform the most complex work in the shortest possible time.

Also, in the presence of the company are used: cement spreaders, rollers, motor graders and mounted stabilizers (for use in small areas).

About technology

soil stabilization is a process of thorough grinding and mixing of the soil with the appropriate inorganic binders (cement or lime), they are added in a proportion of 5-10% by weight, followed by compaction.

When using this technology, inorganic binders there is no need for a significant amount of transport, since absolutely any local soil can be strengthened, whether it be loam, sandy loam or sandy soil, which is nearby, and only binder materials remain to be delivered to the work site.

The presented technology is a durable wear-resistant construction of roads and sites with high quality characteristics for any extreme loads and climatic conditions of Russia.

Road construction by soil stabilization

Soil stabilization technology is used in the following construction:

• repair and reconstruction of existing highways;
• during the construction of highways IV–V categories;
• temporary, technological, auxiliary and dirt roads;
• sidewalks, park, pedestrian and bicycle paths;
• car parks, parking lots, storage and shopping centers and terminals when creating solid foundations for the construction of objects of various categories;
• landfills for solid waste and hazardous substances;
• grounds for industrial flooring and laying of paving slabs;
• foundations for railroad tracks.

Ground stabilization video

Advantages: COST / WORK TIME / STRENGTH OF THE FOUNDATION / WARRANTY

This method has a number of advantages over traditional methods of building road foundations.

COST 50% reduction in the cost of construction work.

SPEED OF WORKS from 3,000 m2 to 8,000 m2 per shift.

STRENGTH OF THE BASE the ultimate compressive strength during soil stabilization using inorganic binders reaches 500 MPa.

WARRANTY The warranty period of the road base with soil stabilization technology reaches 15 years.

The presented advantages became possible due to the following factors:

• complete rejection of the use of non-metallic materials (crushed stone, sand),
• lack of earthworks for excavation of soil for the road structure, and, accordingly, the lack of utilization of this soil,
• complete mechanization of the process,
• modern technology that allows you to accelerate the speed of work.

Soil stabilization
The resulting base can be used both independently, without applying a layer of asphalt, and together with it.

It is also important that the method does not harmful effects on the environment, and also implies complete autonomy and freedom in the choice of material. Modern equipment makes it possible to efficiently carry out soil stabilization directly on site to a depth of up to 50 cm in one working pass with high accuracy in the dosage of binders.

Know-how of National Resources

The use of Hint's disintegration technology made it possible to obtain a stabilized base using cement in an amount of 2%.

This technology makes it possible to increase the strength characteristics of the stabilized base.

Soil stabilization is the possibility of building a road from the ground, without the imposition of an expensive asphalt concrete base.

There is a flexible system of discounts! Individual approach in the formation of a pricing policy for each client!

Soil stabilization - is the most profitable and efficient way to build dirt roads inside settlements, settlements, settlements, cottage settlements in the case when the use of full-fledged asphalt roads or highways.

Soil stabilization technology is as follows:

Step 1.

Road planning. It is necessary to take measures related to ensuring proper drainage with the device drainage ditches and ditches. Elimination of possible stagnation of water near the subgrade, reducing its penetration into autumn period; level down ground water by means of drainage.

Step 2

Determination of the composition of the soil. For the construction of structural layers of pavement and strengthening of roadsides, it is allowed to use both natural soils and imported soils. Soil is delivered using imported soils. In this case, it is necessary to fulfill the following requirements before starting soil stabilization work:

• delivery of soil in the amount necessary for the construction of a structural layer of pavement or roadside reinforcements;
• distribution of soil and its leveling over the entire width of the prepared subgrade or shoulder
• rolling of the leveled layer to a density of 0.85-0.90 of the maximum density according to the standard compaction method.

Soil selection and stabilizer consumption.

• determination of the granulometric composition of the soil intended for use;
• if necessary, adjusting the granulometric composition of the soil mixture by mixing the existing soil with soil of a different granulometric composition;
• determination of the maximum density and optimal moisture content of the soil treated with the stabilizer;
• determination of strength characteristics in accordance with the requirements of GOST 12801-98;
• determination of moisture resistance and water resistance;
• determination of the need for a stabilizer per 1 m2 and in general for a site with the same soil.

Step 3

Mixing of composites.

Preparation of the stabilizer solution. The solution is obtained by diluting the stabilizer in the working container, with stirring the resulting solution for 10 ... 15 minutes. The concentration of the stabilizer solution is set depending on the current soil moisture and its optimal moisture determined by the modified Proctor method for soil samples treated with a stabilizer.

Soil crushing carried out various types road machines in order to obtain a homogeneous grain composition of the mixture in accordance with the requirements of clause 6.4.SNiP. 3.06.03-85 The best crushing of the soil is achieved when its moisture content is 3-5% less than the optimum and the density is 0.85-0.90 of the maximum, determined by the standard compaction method. At low natural humidity soil moistening to the specified degree is carried out 6-12 hours before the start of crushing. At high natural humidity, the soil is dried by repeated mixing in dry windy or sunny weather to a moisture content of 2-4% less than optimal. The soil is considered crushed if it contains no more than 25% of lumps larger than 5.0 mm. In this case, the content of lumps larger than 10.0 mm should not exceed 10.0%.

Step 4

Rolling and compaction.

Profiling surfaces of the stabilized layer are produced in two passes of a motor grader along one track with the creation of a transverse slope of the structural layer of pavement from stabilized soil equal to the transverse slope of the roadway. The cross slope of the shoulder should exceed the cross slope of the carriageway by 1-2%.

Compaction of treated and profiled soil. Produced by self-propelled vibrating or oscillating rollers weighing at least 10 tons. The lower layers of the structural layer of the pavement can be compacted with self-propelled vibratory cam rollers, but the top layer must be compacted with smooth-rolled vibratory or oscillatory rollers weighing at least 15 tons.

Notes.

1. The speed of the roller during compaction should be 3.5-6.5 m/min (the first two passes), for the remaining passes the maximum value is assigned operating speed. The first two passes are carried out with the vibration (oscillation) mode turned off.
2. The number of passes of the roller and the speed of its movement are set according to the results of the test compaction. Approximately 12-18 passes of the roller on one track are required for compaction.
3. The degree of density of the stabilized layer must be at least the maximum standard according to the Proctor method modified in accordance with GOST 22733-2002.

When developing the Road Classification of Stabilizers, the accumulated domestic and foreign experience in the use of chemical additives (stabilizers) and binders to improve soil properties in road construction was taken into account. However, in relation to the domestic practice of road construction, one should clearly distinguish between two parallel existing, but fundamentally various technologies: soil stabilization technology and soil stabilization technology.

stabilization technology differs in that clay soils are treated only with those types of stabilizers that do not contain binders as structure-forming elements, i.e. according to General classification(see figure) they should include cationic (cationic), anionic (anionic), universal and nanostructured stabilizers.

With stabilization technology changes to positive side almost the entire complex of water-physical properties of clay soil. This increases its hydrophobicity. By reducing the filtration coefficient, its water permeability decreases. The heaving and swelling of soils are also reduced, up to complete exclusion. The height of the capillary rise and their optimal humidity decrease with a simultaneous increase in the maximum density with standard compaction (GOST 22733-2002).

stabilization technology should be recommended for use for soils laid in the working layer of the subgrade, since the most intensive processes of the water-thermal regime (WTR) and moisture transfer mainly affect upper part earthen dense road structure. At the same time, the stabilization of soils of the working layer will not only have a positive effect on the WTR, but will also make it possible to lay local muddy soils that were not previously suitable for use in this element of the road structure, by raising their water-physical characteristics in terms of water permeability (GOST 25584-90), heaving (GOST 28622-90), swelling (GOST 24143-80) and soaking (GOST 5180-84) to the required values.

Complex stabilization technology differs in that clay soils are treated with structured stabilizers (see Figure 1), i.e. those that contain a binder in their composition, or any other stabilizers in an amount not exceeding 2% by weight of the soil, or all other types of stabilizers are used , according to their General classification (see Figure 1, Figure 2), but with additional application of a binder to the soil in the same quantities.

The technology of complex stabilization of clay soils, in addition to improving their water-physical properties, contributes to the formation of rigid crystallization bonds, which has a positive effect on increasing the physical and mechanical characteristics of soils, primarily such as shear strength and deformation modulus.

An increase in the strength and deformation characteristics of complexly stabilized clay soils makes it possible to use them not only for the working layer, but also for roadsides, as well as soil bases for pavements and coatings of local (rural) roads. An increase in the amount of binder used in soil treatment in excess of 2% by weight, while maintaining the amount of stabilizer additives introduced into the soil (up to 0.1% by weight), transforms soil stabilization technology into soil stabilization technology, which, taking into account the presence of additives, should be characterized as a technology for complex soil strengthening .

The presence of stabilizer additives in the fortified clay soil, firstly, leads to a decrease in the required binder consumption and, secondly, makes it possible to increase the frost and crack resistance of the fortified soils.

Complexly strengthened soils, as well as reinforced soils, should be used as bases in pavement structures in accordance with GOST 23558-94.

Taking into account the above, the Road classification of stabilizers (see Figure 2) is compiled according to the target functions of soil treatment with additives. This means that, depending on the final function of the treated stabilizer and soil, certain kind soil treatment, taking into account soil properties in terms of pH and the type of stabilizer compatible with this soil.

Also, according to the function of soil properties, the assignment of the resulting material to the required structural element pavement and subgrade of the road. Therefore, the applied nature of the Road Classification of Stabilizers is expressed in its functional orientation, i.e. it clearly reflects the purpose and scope of the stabilizer in the road structure. Therefore, the following main target functions are distinguished:

First function- hydrophobization of soil in the working layer.

Second function- Structurization (together with hydrophobization) of the soil in the foundations of pavement.

Third function- increasing the frost and crack resistance of reinforced soils in the structural layers of pavement.

All the selected target functions of the process of affecting the soil with stabilizer additives are implemented using a similar technology; the curtain is based on the combination of soil with additives and its compaction at optimal moisture content.

The difference in the physical and mechanical properties of the soil mixture depends on the type and quantitative ratios of the stabilizer and binder in the soil and the type of the latter. Therefore, as the basis for dividing the most general and broad concept"Treatment of soils with additives" the following main features are selected.

Class: It is determined by the depth of impact and the degree of change in the structural and physical and mechanical characteristics of the pound.

View: It is determined by the type of additives and their quantitative ratio, with the help of which the required level of change in the physical and mechanical characteristics of the pound is realized.

Subspecies: It is determined by the conditions of compatibility in a pound mixture of the sign of the charge of the stabilizer ions and the type of pounds by pH (acid, alkaline, neutral).

The developed Road Classification of Stabilizers considers only those materials and additives, as well as types and varieties of soils that have received the most wide application and have positive experience. The initial product in the Road Classification are stabilizers, the types of which correspond to their General Classification (see figure).

Stabilizers should be used for processing at optimal moisture content: soils with a plasticity number from 1 to 22, with a content of sand particles of at least 40% by weight and a yield strength WL of not more than 50%, as well as all varieties of coarse clastic and sandy soils containing in their composition dusty and clay particles in an amount of at least 15% by mass, with a content of easily soluble salts - sulfates - not more than 2% by mass, chlorides - not more than 4% by mass, humus - not more than 2% by mass and gypsum impurities - no more than 10%.

Normative references:

• GOST 29213-91 (ISO 896-77) Surfactants. Terms and Definitions
• GOST 25584-90 Soils. Methods for laboratory determination of the filtration coefficient
• GOST 24143-80 Soils. Methods for laboratory determination of swelling and shrinkage characteristics
• GOST 23161-78 Soils. Method for laboratory determination of the characteristics of subsidence.
• GOST 25100-95 Soils. Classification
• GOST 5180-84 Soils. Methods for laboratory determination of physical characteristics
• GOST 22733-2002 Soils. Method for laboratory determination of maximum density

This technology was invented by ANT-Engineering LLC in 2006. To date, more than 150 km of roads of various categories have been built in Russia and abroad. Highways built using ANT technology are operated in all climatic zones: from the desert to the Arctic Circle.

The main element of the technology is the preparation "Soil and organic-mineral mixtures stabilizer" ANT "(eng. - "ant"). It is used both independently for soil stabilization, and together with inorganic or organic binders for strengthening.

The principle of operation of the soil stabilizer "ANT"

The ANT soil stabilizer is a Russian product and is produced in the city of Volzhsky, Volgograd region. It is a complex organic preparation. Its action is aimed at carrying out redox reactions in the soil. Produces a directed oxidative reaction by exposing the surface of the soil particle to molecular oxygen, as well as in the cement (if used). As a result, new oxides are formed. chemical elements contained in the soil. Then, the previously attached oxygen is separated, and a reverse reduction reaction occurs, which leads to the formation of new crystalline compounds in the soil between its particles.

This reaction completely repeats the processes of formation of sedimentary rocks in earth's crust. If we had the opportunity to increase the load during compaction of the treated soil by more than 5 times, then we would be able to obtain reinforced soils with a strength grade of over M200. But, unfortunately, modern technology and methods of road works do not allow us to achieve these results.

In addition, the stabilizer contains surfactants in its composition, which makes it possible to achieve the maximum soil compaction coefficient, and, consequently, obtaining a material with less presence of capillaries. This allows you to significantly reduce the water absorption of stabilized and fortified soils.

5 key benefits

1. High physical and mechanical properties.

Soils reinforced with Stabilizer "ANT", have high physical and mechanical properties and fully comply with the requirements of GOST 23558-94 "Crushed stone-gravel-sand mixtures and soils treated with inorganic binders for road and airfield construction."

For example, during the construction of roads of the V technical category of the transitional type, it is sufficient to install one layer of reinforced soil with a thickness of h = 15 cm. This structural layer is designed for traffic with an axle load of up to 8TC. The total modulus of elasticity on the surface of this layer will be more than 150 MPa.

2. Low consumption, as well as its low estimated cost.

The consumption is 0.007% of the mass of the soil. When carrying out road construction work, 1 liter per 7.5 m 3 of the future layer is required. For the construction of 1 km of a motorway of category IV–V, i.e. device 6000m 2 layers of reinforced soil, 15cm thick, the stabilizer consumption will be 120 liters, the estimated cost, respectively, is 312,000 rubles or 52 rubles / m 2.

3. Simplification of the processes of stabilization and strengthening of soils.

Namely:

• lack of maintenance of hardened soils;
• the possibility of resuming the movement of vehicles immediately after the compaction of the layer;
• no need for expansion joints.

4. UsabilitySoil stabilizer "ANT"both alone and together with inorganic and organic binders.

When using the Stabilizer together with cement, the strength properties of reinforced soils increase by more than 30% relative to control samples without it.

When used together with bitumen emulsions or foamed bitumen, there is a better distribution of the binder throughout the volume of the soil, an increase in the adhesion of binder particles to the soil and a subsequent increase in the physical and mechanical properties of reinforced soils.

5. Complete environmental safety.

Stabilizer "ANT" does not have any negative impact on the environment and is 100% environmentally friendly. When carrying out road construction works, it is not required to provide technical personnel with additional means of protection. Also, it does not have a negative impact on the components of machines and mechanisms.

Scope of soil stabilizer "ANT"

arrangement of foundations for motor roads of category I–V, non-rigid and rigid types;

road surfaces IV - V category of transitional type;

stabilization of the sole and the working layer of the subgrade;

as an additive when strengthening soils with organic or complex binders.

Independently Stabilizer "ANT" can be used in the stabilization of clay soils with a plasticity number from 1 to 17 (sandy loam, loam, clay). Stabilized soils can be used to stabilize the sole or working layer of the subgrade, as well as the construction of the lower layers of the bases.

To obtain reinforced soils, it is necessary to add cement in an amount of 2% -5% by weight of the soil. The rate of cement consumption depends on the type of soil, climate zone and the required strength properties of the reinforced soil. For work it is possible to use sandy loam, loam, sand and gravel mixtures, low-strength stone materials, waste from crushing stone materials and concrete.

Usage Soil stabilizer "ANT", together with organic or complex binders, it allows to reduce the consumption of binders and increase the strength characteristics of reinforced soils. In addition to the ongoing redox reaction in the soil, the ANT Stabilizer will increase the adhesion of the bituminous binder to the soil, as well as evenly distribute it throughout the entire volume of the soil.

Consumption rate

The required amount of Stabilizer is 0.007% by weight of the soil. When carrying out road works, 1 liter of stabilizer per 7.5 m 3 of the future structural layer is taken as the rate of its consumption.

Consumption rate soil stabilizer "ANT" for every 1000m 2 of construction layer, depending on layer thickness

Soil stabilizer "ANT" is used in the form of an aqueous solution. The required amount of water is calculated based on the natural moisture content of the soil and the optimum during compaction. They also provide for a correction for the amount of water for climatic conditions, type of soil, the amount of cement used, etc. In practice, the dissolution ratio of the stabilizer with water ranges from 1:250 to 1:1000.

Road construction options

Road works can be carried out using various options equipment equipment.

Self propelled recyclers. With their help, during the working shift, a constructive layer of reinforced soils is made, with an area of ​​​​over 5000 m 2. The treated soil mixture is prepared directly on the road, in one pass. Water solution dosed into the rotor, and its consumption is controlled by the on-board computer of the machine. The distribution of cement is carried out before the passage of the recycler.

When using technogenic soils, it is possible to prepare the mixture on specialized soil-mixing or concrete-mixing plants. Treated soil is laid using an asphalt paver (best results in terms of geometry) or a motor grader. The speed of work production depends directly on the productivity of mixing plants.

The preparation of the treated soil is also carried out using agricultural cutters and harrows. The penetration into the ground should be 30% higher than the calculated thickness of the structural layer. Best Results are achieved when using horizontal mounted mills driven by the tractor's strength take-off shaft. In practice, the speed of work per shift is 1000 m 2 or more.