Why Is it better to use rounded gravel than irregularly shaped gravel?
Answers
Explanation:
Classification of Aggregates
Aggregates form an essential part of many construction projects, from large-scale commercial to smaller domestic works. Whether you need aggregates to form a sub-base for foundations or paving, decorative aggregates for driveways and footpaths – or simply need something to fill in unsightly holes – you should know which kind of aggregates will work best.
- In this article, we’ll run through the different classifications of aggregates, based on their varying properties.
Classification of aggregates based on:
Grain Size
If you separate aggregates by size, there are two overriding categories:
Fine
Coarse
- The size of fine aggregates is defined as 4.75mm or smaller. That is, aggregates which can be passed through a number 4 sieve, with a mesh size of 4.75mm. Fine aggregates include things such as sand, silt and clay. Crushed stone and crushed gravel might also fall under this category.
Typically, fine aggregates are used to improve workability of a concrete mix.
Coarse aggregates measure above the 4.75mm limit. These are more likely to be natural stone or gravel that has not been crushed or processed. These aggregates will reduce the amount of water needed for a concrete mix, which may also reduce workability but improve its innate strength.
Classification of aggregates based on
- Density
- There are three weight-based variations of aggregates:
- Lightweight
- Standard
- High density
Different density aggregates will have much different applications. Lightweight and ultra lightweight aggregates are more porous than their heavier counterparts, so they can be put to great use in green roof construction, for example. They are also used in mixes for concrete blocks and pavements, as well as insulation and fireproofing.