Primary vs Recycled Aggregates: What’s the Difference and When to Use Them
If you’re planning a construction, landscaping, or groundwork project, understanding the difference between primary and recycled aggregates can help you make informed choices that benefit both your project and the environment. In this guide, we break down what each type of aggregate is, their key differences, and when it’s best to use them.
What Are Primary Aggregates?
Primary aggregates are materials that are extracted directly from natural sources, such as quarries, riverbeds, or pits. These include:
- MOT Type 1 limestone
- Sharp sand
- Building sand
- Ballast
- Gravel
- Crushed rock
They are typically processed to strict industry standards and offer high strength, consistency, and durability, making them ideal for structural and load-bearing applications.
Common Uses for Primary Aggregates:
- Sub-bases for roads, paths, and driveways
- Concrete and asphalt production
- Structural foundations
- Block and bricklaying mortar
- General construction fill
What Are Recycled Aggregates?
Recycled aggregates are made from materials recovered from construction and demolition waste, including:
- Crushed concrete
- Crushed brick
- Reclaimed hardcore
- Screened topsoil
- Recycled Type 1
These materials are processed to remove contaminants and are often graded to meet specific specifications, depending on their end use.
Common Uses for Recycled Aggregates:
- Road sub-base and backfill
- Driveway and path construction
- General landscaping and groundwork
- Temporary surfaces and haul roads
- Sustainable drainage layers
Key Differences: Primary vs Recycled Aggregates
| Feature | Primary Aggregates | Recycled Aggregates |
|---|---|---|
| Source | Naturally extracted | Construction/demolition waste |
| Cost | Generally higher | More cost-effective |
| Environmental Impact | Higher carbon footprint | More sustainable |
| Consistency | Very consistent | May vary slightly depending on processing |
| Ideal For | Structural/engineered projects | General fill and non-load-bearing applications |
When Should You Use Each Type?
- Use Primary Aggregates when:
- High structural strength is essential (e.g. concrete production, road bases)
- Projects must meet strict building regulations or technical specifications
- Long-term durability and minimal settlement are required
- Use Recycled Aggregates when:
- You’re looking for a cost-effective and sustainable option
- The aggregate is not exposed to heavy loads or structural stress
- You’re working on driveways, landscaping, backfilling or temporary works
- Reducing environmental impact is a project priority
Choosing the Right Aggregate for Your Project
The best choice often depends on the type of work, budget, and project requirements. In many cases, a combination of primary and recycled aggregates offers the best balance of performance and sustainability.
If you’re unsure which type of aggregate is right for your job, our expert team is here to help. We supply and deliver a full range of both primary and recycled aggregates across the North East of England, including Northumberland, Newcastle-upon-Tyne, North Tyneside, Gateshead, South Tyneside, Sunderland, County Durham, Darlington, Hartlepool, Stockton-on-Tees, Redcar and Cleveland and Middlesborough.
Need Aggregates Delivered?
We offer fast, reliable delivery of both primary and recycled aggregates across the North East, straight to your site, in the exact quantity you need.
Contact us today for a free quote or friendly advice on choosing the right aggregate for your next project.