Choosing aggregate usually comes down to one question: what job will this material do?
| Product | Particle size | Typical use | Processing |
|---|---|---|---|
| Sand | 0–4 mm | Concrete, plaster, screed | Washed |
| No.1 crushed stone | 4–11 mm | Concrete, asphalt, precast | Washed / screened |
| No.2 crushed stone | 11–22 mm | Structural concrete (Dmax 22) | Screened |
| Coarse crushed stone | 22–45 mm | Road base, drainage | Screened |
| Fill / sub-base | All-in | Road sub-structure, levelling | Run-of-quarry |
| Plant-mix base (PMT) | Plant-mixed | Road base and sub-base | Mixed at plant |
What is plant-mix base?
Plant-mix base (PMT) is base course material blended at the plant to a specified grading. It gives a far more consistent result than mixing on site.
Why plant mixing?
The grading of material mixed on site with a bucket is a matter of chance. In plant-mix, the blend is measured.
When ordering
- State the fraction and tonnage clearly.
- Share the delivery schedule; demand rises in season.
- Assess site access (truck turning space) in advance.
Frequently asked questions
Which fractions are needed for concrete?
Usually a combination of sand (0–4) + No.1 (4–11) + No.2 (11–22).
Are plant-mix and sub-base aggregate the same?
No. Plant-mix is blended in measured proportions at the plant; sub-base aggregate is a more general fill material.
Should fractions be stockpiled separately?
Yes. A mixed stockpile puts the grading out of control.
