Grain Size Analyzer - GSA
The particle size analysis is a typical laboratory test conducted in the field of soil mechanics. The purpose of the analysis is to obtain the particle size distribution of the soils. It allows to group the particles making up the soil into different size classes and to subsequently determine the weight percentages of each class referring them to the dry weight of the initial sample.
The Particle Size Analyser allows the granulometric characterization of soils by measuring the progressive reduction of the density of a soil suspension, consequent to the sedimentation over time of the particles of the material.
This particle sizer uses the procedure prescribed by the ASTM D422 and UNI CEN ISO / TS 17892-4 standards, applied to an electronic hydrostatic balance for the measurement of the modified density.
In particular, it detects the finest fraction of the ground from 0.100 mm to 0.001mm.
Application: Forme de particules, Tamis
Caractéristique: Granulés et agrégats
| Positions / Analysis | 1 position, 3 positions, 6 positions |
| Land survey | 0.100 to 0.001 mm |
| Analysis time | 5/6 hours |
| Sample volume | 500ml |
| Range of density | 0.900 to 1.0500 with 4th decimal place precision |
| Power Supply | 100/240 VAC via external power supply, 50 Hz |
| Repeatability | better than 2% |
The soil classification criteria and acceptance of construction materials for roads, airports, dams, etc., are mainly based on particle size analysis. The information obtained from this type of granulometry test, together with the permeability tests, is used to study filtration problems. The sizing of the filters is defined with a right choice of the granulometric curves of the materials that constitute them, thus allowing the creation of excellent drains.
The GSA Grain Size Analyzer may be used in the following sectors:
- Geotechnical Laboratories
- Civil engineering
- Chemistry
- University
- Technology of materials, structures, civil construction, industrial research and Cultural Heritage
- Infrastructure and environment
Soil properties: "Texture" is a particularly interesting soil parameter: it influences drainage, plasticity and adhesiveness of the soil, as well as its vulnerability to erosion and the percolation of pollutants and the ability to host different types of crops; some chemical characteristics, such as cation exchange capacity, are also correlated with texture. With the data of the texture, it is possible to carry out a first evaluation of some properties of the soil; for example, a predominantly sandy soil will be well aerated and easily workable but will retain little water and will probably be poorly equipped with nutrients, consequently fertilizations will have to be more numerous and lower doses of fertilizers must be used. These soils are also easily eroded by the wind. A clayey soil will usually be characterized by opposite properties: they are more fertile, contain more organic matter, are able to retain a greater amount of water and nutrients, on the other side, they are difficult to work with and also have a low or moderate tendency to be eroded.
It also allows a study to be carried out for the foundations, for embankments (mounds of earth, road that runs at a higher level) and for road pavements, for embankments and for other artifacts.
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