Definition
The graded aggregates is composed of aggregates whose dimensions are smaller value ranging from 6.3 to 80 mm depending on the context.
There are 2 graded aggregates:
- Untreated (GNT): granular material used alone, without binder. Its resistance is related to its compactness and the angularity of the larger grains.
- Wet Mix: Mixture of aggregates and water to obtain a given particle size (used in capping layer for example).
Special features
- The granular material, wet or not, are granular recompositions respecting a range defined in the laboratory.
- Granular material replaces untreated natural aggregates when it is not available or is not mechanically suitable (granular range, frost resistance, etc.). They also allow the recycling of certain materials.
- Typically the facilities for the production of this type of mixture are composed of at least 3 dosers adapted to aggregates to be metered to recompose as thin as possible the granular mix. A powerful mixer is required.
- When an addition of water is made, we speak of Wet mix. This addition aims to compact the material in place and improve its implementation.
Applications
Road infrastructures
Platforms
Railways