Blog https://poly-jet.com ru Thu, 23 Jul 2026 10:17:28 +0300 Expanding Polyurethanes for Weak Soil Stabilization: A Scientific and Practical Perspective https://poly-jet.com/tpost/nkmsxxc121-expanding-polyurethanes-for-weak-soil-st https://poly-jet.com/tpost/nkmsxxc121-expanding-polyurethanes-for-weak-soil-st?amp=true Fri, 10 Jul 2026 00:17:00 +0300 Foundation stability is a critical factor in the safety and service life of buildings and infrastructure.

Expanding Polyurethanes for Weak Soil Stabilization: A Scientific and Practical Perspective

Foundation stability is a critical factor in the safety and service life of buildings and infrastructure. Weak, water-saturated, disturbed, and collapsible soils present significant challenges in the design of industrial facilities, transport infrastructure, utilities, and residential developments.

Until recently, ground improvement relied primarily on conventional methods such as cement grouting, piling, and ground freezing. However, these approaches are often costly, time-consuming, and highly disruptive. This has driven the adoption of more efficient, controllable, and targeted solutions.

One such solution is the injection of expanding polyurethane resins, which enables rapid soil stabilization without excavation while delivering long-term performance.

Fundamentals of Soil Stabilization

Selecting an appropriate ground improvement method requires an understanding of soil behavior. Soil is a complex multi-phase system whose stability depends on composition, moisture content, density, and prior loading or disturbance.

Common Issues
  • Foundation settlement
  • Formation of voids due to particle washout
  • Erosion caused by surface or groundwater flow
  • Loss of bearing capacity under dynamic loading (traffic, industrial activity)

Conventional methods (grouting, piling, ground freezing, geosynthetics) have several limitations:
  • Extensive site preparation requirements
  • Long execution times
  • Disruption of soil structure and environmental balance
  • High implementation costs

By contrast, expanding polyurethane injection enables targeted strengthening with minimal time and resource input.

Technology Overview: Polyurethane Injection Process

The application of expanding polyurethanes is a controlled engineering process. Its success depends on accurate site investigation, correct material selection, and precise execution.

Site Investigation

A geotechnical assessment is carried out prior to injection using methods such as:
  • Ground-penetrating radar (GPR)
  • Static and dynamic testing
  • Laboratory analysis of soil properties

These investigations identify the causes of settlement and void formation and define the scope of treatment.

Injection Design

The selection of resin and injection parameters depends on soil conditions, depth, and required performance. A commonly used solution is PolyJet FT, a two-component polyurethane system with rapid reaction and high expansion capacity.

The design process includes:
  • Determining injection depth
  • Defining injection points
  • Calculating material volumes
  • Establishing injection sequence

Injection is performed using precision equipment, with continuous control of pressure and flow rate.

Injection Execution

  • Marking of injection locations
  • Drilling of boreholes to the required depth
  • Injection of expanding resin with real-time monitoring
  • Control of pressure, expansion, and temperature
  • Post-treatment verification using non-destructive methods (GPR, thermal imaging, probing, plate load testing)

Material Properties (PolyJet FT)

  • Density: 1.1–1.2 g/cm³
  • Viscosity: 200–250 mPa·s
  • Reaction time: ~5 seconds
  • Expansion ratio: up to 32×
  • Application temperature: +3 to +40 °C

The material adheres well to mineral substrates, is resistant to chemical and biological degradation, and performs reliably in challenging hydrogeological conditions.

Quality control includes:
  • Incoming material verification
  • Monitoring of injection parameters
  • Post-treatment testing

Advantages of the Method

The effectiveness of expanding polyurethanes is supported by both research and field applications:
  • Fast execution: Typically 5–10 times faster than traditional methods
  • Minimal disruption: No excavation or structural dismantling required
  • High precision: Targeted treatment reduces unintended impacts
  • Environmental safety: The material becomes inert after curing
  • Durability: Service life exceeds 40 years, even under dynamic loading
  • Cost efficiency: Reduced repair and maintenance costs
  • Localized application: Suitable for partial repairs without interrupting operations

Case Studies

Industrial Floor Stabilization

Objective: Eliminate settlement and voids beneath slabs in a 340 m² facility
Solution: Injection of PolyJet FT beneath each slab, achieving controlled lifting of 45–150 mm
Outcome:
  • Floor restored to design level within hours
  • Operations resumed immediately
  • No measurable changes after 5 years
  • Cost savings exceeding 70% compared to conventional repair

Foundation Stabilization of an Office Building

Objective: Restore bearing capacity beneath a structural column
Solution: Localized injection forming a dense composite of polymer and compacted soil
Outcome:
  • Bearing capacity increased by 120%
  • Confirmed by field testing
  • No interruption to building operation

Environmental and Regulatory Considerations

The environmental safety of polyurethane injection is confirmed by certification and compliance with applicable standards. The material does not release harmful substances, remains chemically inert in wet and aggressive environments, and does not degrade biologically.

Works are carried out in accordance with:
  • GOST 2761-84
  • SP 22.13330.2016
  • Government Decree No. 87 (RF)

Proper documentation is essential, particularly for technically complex projects.

Future Applications

The use of polyurethane injection continues to expand:
  • Rehabilitation of urban roads and paved areas
  • Stabilization of tunnels and underground infrastructure
  • Restoration of heritage structures
  • Upgrading of utilities, industrial floors, and waterproofing systems

Advancements include integration into building standards and the development of automated monitoring systems.

Conclusions and Recommendations

Expanding polyurethane injection is an effective solution for stabilizing problematic soils. Both research and practical experience confirm its reliability and long-term performance.

Successful application depends on:
  • thorough site investigation,
  • proper engineering design,
  • controlled execution.

Recommendation:
Engage experienced contractors, verify certifications, and ensure proper testing and monitoring of results.

References and Standards

  • GOST 2761-84 — Soils. Testing Methods
  • SP 22.13330.2016 — Foundations of Buildings and Structures
  • Government Decree No. 87 — Project Documentation Requirements
  • STO NOSTROY 2.3.18-2011 — Soil Stabilization by Injection Methods in Construction
  • Geotechnics Journal, No. 2, 2025
]]> Advantages of Injection Polyurethane Systems over Conventional Ground Stabilization Methods https://poly-jet.com/tpost/0ne945jrs1-advantages-of-injection-polyurethane-sys https://poly-jet.com/tpost/0ne945jrs1-advantages-of-injection-polyurethane-sys?amp=true Fri, 10 Jul 2026 00:24:00 +0300 Ground improvement is a fundamental aspect of construction, rehabilitation, and repair of structures built on unstable soils.

Advantages of Injection Polyurethane Systems over Conventional Ground Stabilization Methods

Ground improvement is a fundamental aspect of construction, rehabilitation, and repair of structures built on unstable soils. Traditionally, engineers have relied on methods such as piling, cement grouting, and ground freezing. However, advances in chemical technologies have introduced more efficient solutions that allow for targeted, fast, and cost-effective intervention.

One of the most effective approaches is the use of expanding polyurethane injection systems. This article provides a detailed analysis of their advantages, with a focus on underlying mechanisms, material behavior, and practical applications.

Conventional Ground Improvement Methods: Capabilities and Limitations

Before comparing innovative solutions with traditional methods, it is important to review commonly used approaches:
  • Cement grouting: Injection of cementitious materials to increase soil density and bearing capacity
  • Piles: Driven or bored elements transferring loads to deeper, more stable strata
  • Geotextiles and geogrids: Synthetic materials used for load distribution and surface stabilization
  • Ground freezing: Use of refrigerants to temporarily increase soil strength

Despite their widespread use, these methods have several limitations:
  • Require extensive site preparation and mobilization of heavy equipment
  • Often unsuitable for localized issues or targeted repairs
  • Difficult to implement without disrupting ongoing operations
  • Performance is sensitive to groundwater conditions, soil composition, and environmental factors

Mechanism and Advantages of Expanding Polyurethanes

Polyurethane injection is a well-established method for localized strengthening and stabilization of weak, compressible, and water-bearing soils. When the components are mixed, a rapid chemical reaction occurs, forming an expanding polymer matrix.

Key Advantages

  • Fast reaction time: Expansion begins within seconds (typically 5–10 seconds for systems such as PolyJet FT), enabling precise material placement
  • Controlled application: Pressure and expansion can be regulated to target specific zones and reinforce load-bearing areas
  • Low invasiveness: No need for large-scale excavation or structural dismantling; work is performed through small-diameter injection points
  • Performance in challenging conditions: Effective in saturated soils and chemically aggressive environments (acidic or alkaline)
  • Time and cost efficiency: Typically 4–10 times faster than cement grouting, with reduced project costs due to shorter execution time and minimal equipment requirements
  • Immediate load-bearing capacity: Strength improvement is achieved almost instantly, without curing time or operational downtime

Physico-Chemical Properties

Key material parameters include:
  • Density: 1.1–1.2 g/cm³ (PolyJet FT)
  • Viscosity: 200–250 mPa·s
  • Expansion ratio: up to 32×
  • Application temperature range: +3 to +40 °C

Mechanism of Action

Injection polyurethane systems are reactive polymers that rapidly form a closed-cell structure upon mixing, with or without the presence of moisture. This structure is capable of sustaining significant mechanical loads.

The expanding material fills voids, redistributes stresses, and displaces water from soil pores and capillaries, contributing to improved stability of the soil mass.

Comparative Overview (Repair Applications)

Method
Duration
Precision
Environmental Impact
Service Life
Cost
Cement grouting
Weeks
Low
Moderate
10–25 years
High
Piles
Weeks–months
Medium
Moderate
50+ years
Very high
Geotextiles / geogrids
Days
Medium
High
10–20 years
Medium
Expanding polyurethanes
Hours–days
Very high
Very high
40+ years
Low

Practical Case Studies

Injection polyurethane systems have been successfully applied in numerous projects worldwide.

Case 1: Industrial Floor Stabilization

At a logistics facility, flooding caused settlement of concrete floor slabs. Conventional repair would have required full slab removal, resulting in a week of downtime and significant cost.

Instead, polyurethane injection was used:
  • Material injected beneath 30 slabs
  • Floor restored to design elevation within 4 hours
  • Cost savings of approximately 70%
  • Total project duration — one working day

Case 2: Tunnel Sealing

In an urban metro system, water ingress caused erosion near sheet pile structures. Polyurethane injection enabled rapid formation of impermeable barriers, stopping inflow and eliminating the risk of failure within 12 hours.

Environmental and Health Considerations

Environmental performance is a key factor when selecting a stabilization method. Injection polyurethanes offer the following advantages:

  • Do not release harmful substances during or after reaction
  • Chemically inert in wet and aggressive environments
  • Do not disrupt soil structure or natural balance
  • Comply with applicable environmental and health standards

All works are supported by appropriate certification, licensing, and compliance documentation.

Regulatory Framework and Standards

Injection works are carried out in accordance with relevant standards and regulations, including:

  • GOST 2761-84
  • SP 22.13330.2016 — Foundations of Buildings and Structures
  • Government Decree No. 87 (Russian Federation) — Project Documentation Requirements
  • STO NOSTROY 2.3.18-2011 — Soil Stabilization by Injection Methods in Construction
  • Manufacturer technical documentation

Proper project documentation ensures seamless integration of the method into construction workflows.

Conclusions and Recommendations

Both research and practical experience demonstrate that expanding polyurethane injection is an effective solution for fast, cost-efficient, and durable ground improvement.

The technology:
  • reduces repair time and costs,
  • minimizes environmental impact,
  • ensures long-term performance and reliability.

Recommendation:
Engage certified contractors, review project documentation carefully, and require verification of results through appropriate testing and monitoring.

References and Standards

  • GOST 2761-84 — Soils. Testing Methods
  • SP 22.13330.2016 — Foundations of Buildings and Structures
  • Government Decree No. 87 — Project Documentation Requirements
  • STO NOSTROY 2.3.18-2011 — Soil Stabilization by Injection Methods in Construction
  • Geotechnics Journal, No. 3, 2025
]]> PolyJet FT Technology: An Innovative Solution for Geotechnical Challenges https://poly-jet.com/tpost/nutruuf7i1-polyjet-ft-technology-an-innovative-solu https://poly-jet.com/tpost/nutruuf7i1-polyjet-ft-technology-an-innovative-solu?amp=true Fri, 10 Jul 2026 09:22:00 +0300 In recent years, engineers have increasingly adopted advanced chemical technologies to address complex ground improvement and structural repair challenges.

PolyJet FT Technology: An Innovative Solution for Geotechnical Challenges

In recent years, engineers have increasingly adopted advanced chemical technologies to address complex ground improvement and structural repair challenges. Among the most effective solutions are injection-based expanding polyurethane systems—particularly the PolyJet FT system.

This technology is widely recognized within the industry as a reliable and innovative solution: it enables fast execution, delivers consistent and durable results, operates within controlled parameters, and meets environmental safety requirements.

This article outlines the core principles of the technology, its physico-chemical properties, implementation process, and key benefits for developers and contractors.

Scientific Background and Development of PolyJet FT

The development of injection polyurethane systems has been driven by advances in high-reactivity foaming catalysts and increasingly stringent safety standards. PolyJet FT is the result of combined research by Russian and international laboratories, as well as practical experience gained from infrastructure, industrial, and civil engineering projects.

PolyJet FT is a two-component polyurethane system specifically designed for geotechnical applications. It performs reliably in challenging climatic and hydrogeological conditions, offering stable material properties and rapid reaction times.

Operating Principles and Material Properties

PolyJet FT is based on the controlled mixing of two components—polyol and isocyanate—which initiates a rapid foaming reaction. The resulting cellular structure distributes loads evenly, absorbs vibrations, and stabilizes the surrounding soil.

Key Properties

  • Density: 1.1–1.2 g/cm³
  • Viscosity: 200–250 mPa·s
  • Expansion ratio: up to 32×
  • Reaction initiation time: approximately 5 seconds
  • Operating temperature range: +3 to +40 °C

The material demonstrates strong adhesion, resistance to biological degradation, and stability when exposed to salts, acids, and alkalis. It does not release hazardous substances into the soil or atmosphere.

Implementation Process

Successful application of the technology requires a structured workflow:
1. Site Investigation
  • Visual assessment of ground conditions
  • Instrumental testing (dynamic and static probing, ground-penetrating radar, and other minimally invasive methods)
  • Plate load tests and laboratory analysis
  • Identification of zones requiring improvement

2. Injection Design
  • Layout of injection points
  • Estimation of required material volumes
  • Modelling of expected performance using engineering software

3. Equipment Preparation
Specialized equipment is used, including injection pumps, dosing systems, and mixing units. Flow rate and pressure are controlled to ensure uniform distribution of the material.

4. Injection Works
  • Drilling of small-diameter holes (typically 10–20 mm)
  • Injection of PolyJet FT in accordance with design parameters
  • Continuous monitoring of pressure, temperature, and reaction behavior
5. Verification and Quality Control
Within hours of completion, performance is verified using:
  • Ground-penetrating radar
  • Static and dynamic testing
  • Geotechnical monitoring methods

Advantages of PolyJet FT

Compared to traditional methods, PolyJet FT offers several key advantages:
  • Fast execution: Projects can be completed within hours or days
  • Minimal disruption: No need to stop operations or dismantle structures
  • Long service life (30–40 years): Material properties remain stable over time
  • Environmental compliance: Meets applicable safety and environmental standards
  • Precision: Allows localized treatment of specific problem areas
  • Accessibility: Suitable for confined or hard-to-reach areas without heavy equipment
  • Compatibility: Easily integrated into existing design and construction practices

Practical Applications

PolyJet FT has been successfully used in a wide range of projects:
  • Industrial floor rehabilitation: Restoring levels without dismantling
  • Void filling beneath foundations: Recovering load-bearing capacity
  • Sealing of tunnels and utility structures: Eliminating leaks and preventing erosion
  • Control of groundwater inflow in excavations: Preventing water ingress and soil washout, ensuring safe working conditions

Additional case studies are available upon request.

Environmental and Regulatory Compliance

PolyJet FT has undergone all required testing and holds relevant certifications, including environmental and health approvals. Injection works are carried out in accordance with applicable standards such as STO NOSTROY 2.3.18-2011 and SP 22.13330.2016.

The available technical documentation supports the use of this technology in projects of any scale—from private developments to major infrastructure works.

Conclusions and Recommendations

PolyJet FT is a proven and effective solution for ground improvement and structural stabilization. It provides a fast, reliable, and cost-efficient approach to addressing weak or unstable soils.

Recommendation:
Consider incorporating PolyJet FT into design solutions for both new construction and rehabilitation projects, particularly where minimal disruption and long-term performance are critical.

References and Standards

  • SP 22.13330.2016 — Foundations of Buildings and Structures
  • Technical Regulations on the Safety of Construction Materials
  • STO NOSTROY 2.3.18-2011 — Soil Stabilization by Injection Methods in Construction
  • Geotechnics Journal, No. 4, 2025
]]> Application of Expanding Polyurethanes for Lifting Settled Concrete Slabs: An Expert Guide https://poly-jet.com/tpost/spn4md5141-application-of-expanding-polyurethanes-f https://poly-jet.com/tpost/spn4md5141-application-of-expanding-polyurethanes-f?amp=true Fri, 10 Jul 2026 09:29:00 +0300 Lifting and restoring settled concrete slabs is a common challenge in modern engineering practice.

Application of Expanding Polyurethanes for Lifting Settled Concrete Slabs: An Expert Guide

Lifting and restoring settled concrete slabs is a common challenge in modern engineering practice. Settlement of floors, industrial platforms, roadways, and production areas can reduce operational safety, cause equipment malfunctions, accelerate machinery wear, lead to production downtime, and disrupt day-to-day operations.

Traditional repair methods—such as demolition and full slab replacement—are time-consuming and costly. In recent years, injection polyurethane systems have emerged as an effective alternative, enabling faster, more cost-efficient repairs with minimal disruption to ongoing operations.

This article outlines the key principles, process steps, and advantages of using expanding polyurethanes for slab lifting.

Causes of Concrete Slab Settlement

Understanding the root cause of settlement is essential before starting any remediation work. The most common causes include:
  • Erosion and washout of fine soil particles due to drainage issues or water ingress
  • Inadequate compaction or poor subgrade preparation during construction
  • Long-term dynamic loading (e.g., warehouse traffic, heavy equipment, vibration)
  • Utility failures, leakage, or other man-made ground disturbances

A settled or deflected slab leads to uneven load distribution, increases the risk of structural damage, and requires timely corrective action.

Advantages of Expanding Polyurethanes for Slab Lifting

Injection technology using expanding polyurethanes offers several key advantages:
  • Rapid repair: Structures can be restored to design levels within hours, without extended downtime
  • Targeted application: Treatment is applied only where needed, without affecting surrounding areas
  • No demolition required: Eliminates the need for dismantling or slab replacement, reducing costs
  • Simultaneous void filling: Expanding polyurethane fills voids and restores contact with the subgrade
  • Quick return to service: Facilities can typically resume operation within hours
  • Reduced operational risk: Eliminating uneven surfaces helps prevent equipment damage and safety incidents

Work Process: Step-by-Step Approach

Effective implementation requires a structured and controlled workflow:

1. Geotechnical Assessment
  • Visual inspection of the slab and subgrade to determine the type of settlement (uniform, localized, edge-related)
  • Ground-penetrating radar (GPR) surveys and in-situ testing of subgrade conditions
  • Identification of voids and assessment of their extent and depth

2. Injection Design
  • Marking and layout of injection points on the slab surface
  • Estimation of required material volume and modelling of the lifting process

3. Equipment and Material Preparation
  • Inspection and setup of equipment (pumps, dosing units, injection systems)
  • Preparation of polyurethane components (e.g., PolyJet or equivalent), including control of temperature and viscosity

4. Injection Execution
  • Drilling of injection holes (8–20 mm diameter) according to the layout
  • Injection of polyurethane beneath the slab at controlled pressure
  • Continuous monitoring of expansion, lift progression, and surface response

5. Final Quality Control
  • Sealing of injection holes and surface restoration
  • Instrumental and visual verification of slab level and flatness

Case Studies

Expanding polyurethanes have been successfully used in numerous slab lifting projects.

Case 1: Industrial Warehouse Floor Restoration
  • Floor settlement in the loading area exceeding 80 mm
  • PolyJet FT injected at 24 points; total project duration — 7 hours
  • Cost savings of over 65% compared to slab replacement
  • After 3 years, measured deviation remains within 2 mm

Case 2: Supermarket Floor Repair
  • Settlement in a retail area corrected without interrupting operations
  • Work carried out overnight; store reopened the following morning

Environmental and Safety Considerations

The polyurethane resins used in injection applications are certified, do not release harmful substances, and become fully inert after polymerization. Ground disturbance is minimal.

The materials comply with environmental and health safety standards and are suitable for use in sensitive environments, including food production facilities.

Conclusions and Recommendations

Injection-based slab lifting using expanding polyurethanes is an efficient, reliable, and cost-effective solution for addressing settlement.

The method offers:
  • durable results,
  • minimal disruption,
  • no need for structural demolition,
  • reduced operational risks.

Recommendation:
Always conduct a proper site assessment and use certified materials that comply with applicable regional standards (e.g., EU, local regulations).

References and Standards

  • GOST 2761-84 — Soils. Testing Methods
  • SP 22.13330.2016 — Foundations of Buildings and Structures
  • PolyJet FT Technical Documentation
  • STO NOSTROY 2.3.18-2011 — Soil Stabilization by Injection Methods in Construction
  • Geotechnics Journal, No. 5, 2025
]]> Environmental Safety and Health Compliance of Injection Polyurethanes https://poly-jet.com/tpost/bblflih3g1-environmental-safety-and-health-complian https://poly-jet.com/tpost/bblflih3g1-environmental-safety-and-health-complian?amp=true Fri, 10 Jul 2026 09:55:00 +0300 Environmental safety is a critical consideration in modern engineering practice. Materials used for stabilization, sealing, and foundation lifting must not only be effective but also safe for the environment, personnel, and facility operators.

Environmental Safety and Health Compliance of Injection Polyurethanes

Environmental safety is a critical consideration in modern engineering practice. Materials used for stabilization, sealing, and foundation lifting must not only be effective but also safe for the environment, personnel, and facility operators.

Expanding polyurethanes are among the most environmentally friendly technologies in geotechnical engineering. This article provides a detailed overview of the environmental and health safety aspects of injection polyurethanes, including regulatory frameworks, certification, monitoring practices, and both international and Russian regulatory experience.

Why Environmental Safety Has Become a Critical Factor

Urbanization, increasingly stringent environmental protection requirements, and evolving construction and infrastructure regulations are driving the adoption of technologies with minimal environmental and health impact.

Traditional reinforcement and repair methods—such as cement grouting, piling, and chemical resins—can disrupt groundwater balance, soil structure, and ecosystems.

Expanding polyurethanes are advanced engineered materials specifically developed for use in facilities with elevated environmental and public health requirements, including residential complexes, industrial zones, and food production facilities.

Chemical Composition and Inertness of Polyurethanes

Modern injection polyurethane resins consist of highly purified components: polyol and isocyanate. Upon mixing and expansion, rapid polymerization forms an inert three-dimensional matrix that does not release hazardous compounds.
Key properties:
  • Inertness:
Expanded polyurethane is stable in contact with water and soil. It contains no phenols, formaldehyde, or heavy metal salts and does not emit hazardous substances.
  • Biostability:
Resistant to biological degradation and does not disrupt soil microflora or biogeochemical balance.
  • Environmental compatibility:
Maintains performance within a temperature range of –40°C to +70°C and does not react with rainwater, groundwater, or process water.

Health and Environmental Compliance at Implementation Sites

Any geotechnical technology requires strict control during implementation. Polyurethane injection works follow these principles:
  • Use of certified materials compliant with GOST, REACH, ISO, and other applicable standards
  • Pre- and post-implementation testing of air, soil, and water
  • Issuance of sanitary compliance documentation and health certificates
  • Final safety certification; works may proceed only after formal approval

Important note:
The use of expanding polyurethanes does not require removal of contaminated soil, special disposal procedures, or site remediation.

Operational Safety for Building Users

A key advantage of this method is the absence of negative impact on occupants and operational personnel:
  • No need for temporary evacuation or facility shutdown
  • Premises can typically be used within hours after completion
  • The material is inert and emits no vapors or gases
  • Pre-mixed components are transported and stored in accordance with international safety standards, eliminating the risk of accidental contamination

International Regulatory Practices and Standards

Safety requirements for construction materials are continuously tightening worldwide:
  • European Union: REACH and CLP regulations
  • United States: EPA environmental regulations and FDA standards
  • Russian Federation: GOST 12.1.007, SP 22.13330, SanPiN

Manufacturers must provide certification, safety data, and guidelines for application, storage, and disposal.

Project documentation is subject to environmental and health compliance review before and after implementation.

Practical Experience and Expert Recommendations

Expanding polyurethanes have been successfully applied in environmentally sensitive and socially significant facilities, including:
  • kindergartens, schools, and hospitals
  • warehouses and food industry facilities
  • wastewater treatment plants and hydraulic structures

Long-term performance assessments show that the material retains its properties, has no adverse impact on environmental or health conditions, and requires no additional remediation measures.

Conclusions and Recommendations

Expanding polyurethanes are among the safest materials used in geotechnical engineering for both environmental and human health.

When properly applied, controlled, and documented, this technology meets the most stringent international and Russian regulatory requirements and does not negatively impact facility operation or quality of life.

Recommendations:
  • use certified materials only
  • conduct laboratory monitoring
  • ensure proper storage and transportation in accordance with manufacturer guidelines

References and Regulatory Framework

  • GOST 12.1.007-76 (Occupational Safety – Hazardous Substances)
  • GOST 2761-84
  • SanPiN 2.1.7.1322-03
  • REACH Regulation (EU)
  • EPA environmental regulations (USA)
  • Geotechnics Journal, No. 6, 2025
  • PolyJet FT Technical Documentation
]]>