Fill sand, commonly known as “Dafan,” is a compactable material used in construction for backfilling, leveling, and foundational support. It is composed of fine to medium-sized granular particles that enhance soil stability, making it a crucial material for road construction, foundation preparation, and landscaping applications.
Why You Should Use It?
Excellent Compaction: Ensures soil stability and reduces settlement.
Enhances Drainage: Prevents water accumulation in construction sites.
Multipurpose Material: Used in roads, buildings, and landscaping.
Affordable and Readily Available: Cost-effective for large-scale projects.
Improves Load Distribution: Provides strong support for structures.
Key Features
Property
Description
Grain Size
Fine to medium (≤ 5 mm)
Color
Light brown, beige, or gray
Material Composition
Sand, silt, and small gravel particles
Moisture Content
Variable (depending on site conditions)
Compaction Capability
High
Uses
Backfilling: Ideal for filling trenches, foundation gaps, and underground spaces.
Foundation Support: Enhances stability for roads and buildings.
Road Base Preparation: Forms a solid base before pavement installation.
Drainage Systems: Allows water movement, reducing the risk of erosion.
Landscaping and Grading: Provides an even surface for outdoor spaces.
Density & Composition
Factor
Value
Bulk Density
1400–1700 kg/m³
Moisture Absorption
2%–10% (varies by site conditions)
Porosity
20%–35%
Clay & Silt Content
≤ 10%
Case Studies
Infrastructure Projects: Used in major roadworks for compaction and stability.
Building Foundations: Ensures structural integrity by preventing settlement.
Sports Fields & Parks: Provides a level and well-drained surface.
Application Recommendations
Proper Compaction: Use a mechanical compactor for optimal results.
Moisture Control: Keep moisture levels balanced for better density.
Layered Installation: Apply in layers for even load distribution.
Regular Testing: Monitor density and composition for consistent quality.
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