Construction of Geocell-Stabilized Parking Lot Pavement

1. Introduction

Geocell stabilization is an effective solution for enhancing the load-bearing capacity and longevity of parking lot pavements. By confining granular materials within a three-dimensional cellular structure, geocells reduce lateral displacement, improve load distribution, and minimize rutting. This article outlines the key steps in constructing a geocell-stabilized parking lot pavement.

2. Materials and Equipment

• Geocells: High-density polyethylene (HDPE) or polymer-based cellular confinement systems.

• Base/Subbase Material: Well-graded crushed stone or granular fill (e.g., ASTM D2940).

• Surface Layer: Asphalt, concrete, or gravel, depending on design requirements.

• Equipment: Excavators, compactors, geocell deployment tools, and grading equipment.

3. Construction Steps

3.1 Site Preparation

• Clear the area of vegetation, debris, and soft spots.

• Excavate to the required subgrade elevation and ensure proper drainage.

• Compact the subgrade to ≥95% of maximum dry density (ASTM D698 or D1557).

3.2 Geocell Installation

• Unroll and expand the geocell panels over the prepared subgrade.

• Anchor the geocells using stakes or pins at regular intervals to prevent movement.

• Overlap adjacent panels and secure connections for continuity.

3.3 Infill Placement

• Fill the geocell compartments with selected granular material (e.g., crushed stone, sand, or soil).

• Spread the infill evenly and slightly overfill to account for compaction.

• Compact the infill in layers (typically 150–200 mm lifts) using vibratory rollers or plate compactors.

3.4 Surface Layer Construction

• For paved surfaces: Apply asphalt or concrete over the compacted geocell layer.

• For unpaved surfaces: Add a wearing course of gravel or crushed stone.

• Ensure proper compaction and grading for drainage.

4. Quality Control

• Verify geocell material properties (e.g., tensile strength, weld strength).

• Check infill compaction density (≥95% Proctor density).

• Inspect for proper anchorage and panel alignment.

5. Benefits of Geocell Stabilization

• Increased Load Capacity: Reduces stress on subgrade.

• Erosion Control: Prevents material washout.

• Cost-Effectiveness: Minimizes aggregate usage and maintenance.

• Durability: Extends pavement service life.

6. Conclusion

Geocell-stabilized parking lots provide a robust, cost-efficient solution for weak or unstable subgrades. Proper installation, material selection, and compaction are critical for optimal performance. This method is particularly suitable for heavy-traffic areas, eco-friendly designs, and sites with poor soil conditions.

This guide follows industry standards (ASTM, FHWA) and best practices for geocell-reinforced pavement construction. Adjustments may be needed based on site-specific conditions and engineering requirements.