Geomembrane for Construction Engineering

Product Definition

The Geomembrane for Construction Engineering is an impermeable polymeric barrier sheet designed to control fluid migration in civil, hydraulic, and structural projects. It provides long-term leakage prevention, chemical resistance, and mechanical stability for foundations, tunnels, basements, and infrastructure containment systems.

Technical Parameters and Specifications

Key engineering specifications aligned with international construction practices:

• Nominal Thickness: 0.5 mm, 0.75 mm, 1.0 mm, 1.5 mm, 2.0 mm

• Sheet Width: 5.0–8.0 m

• Roll Length: 50–200 m

• Density: ≥ 0.94 g/cm³ (HDPE grades)

• Tensile Strength at Yield: ≥ 14–20 kN/m (depending on thickness)

• Elongation at Break: ≥ 700%

• Puncture Resistance (CBR): ≥ 1.6–4.0 kN

• Carbon Black Content: 2.0–3.0%

• Service Temperature: -40°C to +60°C

• Permeability Coefficient: ≤ 1.0 × 10⁻¹³ m/s

Structure and Material Composition

Typical engineered layer structure:

• Upper Functional Layer: UV-stabilized smooth or textured polymer surface

• Core Barrier Layer: High-density polyethylene or flexible polymer matrix

• Bottom Contact Layer: Micro-textured surface to improve interface friction

• Optional Cushion Layer: Nonwoven geotextile for impact protection

Manufacturing Process

Standardized engineering production workflow:

1. Raw Material Dosing: Virgin HDPE/LLDPE resin with antioxidant and carbon black masterbatch

2. Drying and Conditioning: Hopper drying to maintain moisture below technical thresholds

3. Flat Die Extrusion: Multi-zone heating system controlled between 180–220°C

4. Sheet Forming: Precision calendering for thickness control

5. Surface Texturing: Embossing rollers for friction optimization

6. Automatic Cooling: Water-cooled conveyor stabilization

7. Inline Monitoring: Laser thickness gauges and spark testing equipment

8. Final Winding: Tension-controlled automatic roll systems

Industry Comparison

Application Scenarios

• Foundation waterproofing systems for commercial and industrial buildings

• Tunnel and subway structural water barriers

• Basement and underground parking deck linings

• Bridge abutment and retaining wall protection layers

• Water reservoirs and temporary cofferdams

Core Pain Points and Engineering Solutions

• Uncontrolled Seepage: Hot-wedge welded seams with air-channel testing

• Mechanical Damage from Backfill: Installation of protective geotextile layers

• Chemical Attack from Soil Contaminants: Use of antioxidant-stabilized polymers

• Thermal Movement Stress: Flexible anchoring and expansion design zones

Risk Warnings and Mitigation Recommendations

• Risk: Poor seam quality caused by dusty surfaces
  Mitigation: On-site seam surface cleaning before welding

• Risk: Subgrade settlement after installation
  Mitigation: Geotechnical compaction and bearing capacity verification

• Risk: Long-term UV degradation
  Mitigation: Early backfilling or temporary UV covers

• Risk: Inadequate drainage behind liner
  Mitigation: Design composite drainage layers

Procurement and Selection Guide

1. Identify project exposure conditions (water table, chemicals, temperature)

2. Select thickness based on hydraulic head and structural loads

3. Specify texture requirements for slope stability

4. Define welding technology and seam testing protocols

5. Request factory quality management documentation

6. Verify third-party laboratory test reports

7. Plan logistics for roll sizes and lifting equipment

Engineering Application Case

In a 60,000 m² underground parking structure project, Geomembrane for Construction Engineering was installed as a continuous waterproofing barrier beneath the reinforced concrete base. The system used textured sheets and double-track welding, achieving stable long-term groundwater isolation performance under permanent hydrostatic pressure conditions.

FAQ

• Q1: Suitable thickness for foundation works? A: Typically 1.0–1.5 mm.

• Q2: Can it be welded in cold climates? A: Yes, with controlled preheating.

• Q3: Standard overlap width? A: 100–150 mm.

• Q4: Can it be used with shotcrete? A: Yes, with separation geotextile layers.

• Q5: Expected service life? A: 25–50 years depending on exposure.

• Q6: Resistance to hydrocarbons? A: Good resistance to typical fuel oils.

• Q7: Repair method? A: Extrusion welded patches.

• Q8: Fire behavior? A: Self-extinguishing grades are available.

• Q9: Storage durability before installation? A: Up to 12 months under cover.

• Q10: Can it be installed on vertical walls? A: Yes, with mechanical anchoring.

Call to Action

To request a formal quotation, technical datasheets, or engineered samples for Geomembrane for Construction Engineering, please submit full project specifications to the technical sales team.

E-E-A-T Author Credentials

This document is prepared by a geotechnical engineering specialist with over 15 years of experience in civil waterproofing systems, containment design, and large-scale construction engineering consultancy.