Flat and Elongated Particles: Why Particle Shape Matters
Flat and elongated particles reduce compaction and workability and break under load. Learn how they are measured, what they do and how production reduces them.
Based on pavement design
Road Construction
Road construction
Base and subbase layers spread traffic loads across the road foundation, and pavement life depends on their quality.
The role of materials in Road construction
Aggregates make up much of a road's structure. Subbase and base layers reduce traffic stresses before they reach the subgrade, and their performance depends on continuous grading, fractured faces and control of plastic fines.
In Iran these materials are specified mainly under Publication 101 and each project's particular specification. Compactability and uniformity along the route determine the quality of the layer.
Selection criteriaWhat matters
Three deciding criteria
- 1
Continuous grading
A good spread of sizes provides the layer's compactability and bearing capacity.
- 2
Fractured faces
Crushed particles increase interlock and the layer's stability under traffic.
- 3
Fines control
Plasticity of the fines must be limited so the layer stays stable under moisture.
Related productsMaterials
Materials commonly used for Road construction
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Based on pavement design
Subbase material
A granular layer between subgrade and base that distributes load and improves drainage.Specifications and usesQuality and technical information
Quality and technical information
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Industry developments
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Industrial applications
Base and Subbase: How Granular Layers Decide Pavement Life
Base and subbase layers spread traffic loads into the subgrade. Learn how the two layers differ, what their materials need and the key points of placing them.
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