The sand-gravel mixture, which is known by the abbreviation PShS, consists of 50 percent screenings and the same amount of gravel. Moreover, the content of the last ingredient or gravel should be at least 15% of the total mass. This material is obtained as a result of crushing of limestone, and its natural variety can also be attributed here.
general description
The sand and gravel mixture has excellent drainage characteristics and a relatively low cost. These two factors make the material quite popular in the repair and construction. It is great for compacting layers during road works. The composition is indispensable for the construction of concrete, asphalt and other sites. It becomes part of the crane tracks. The composition is widely used in balancing railway embankments, as well as in the manufacture of asphalt mixtures.
Classification of PSA
The sand and gravel mixture can be enriched or natural, the first of which is obtained by natural enrichment. Among other things, some groups of materials can be distinguished, among them C2, which suggests fractionality up to 20 millimeters. If we are talking about the composition under the acronym C4 or C5, then you have a fraction of up to 80 millimeters. The designation C6 also indicates a fractionality from 0 to 40 millimeters. On sale, you can also find C12, which implies the inclusion of up to 10 millimeters. Depending on the purpose, the mixture may be of the following types: for covering roads and the base of airfields, for ballasting railway embankments and for the manufacture of asphalt mixes.
Using crushed sand
Sand and gravel mixture, depending on the application, has certain qualitative characteristics. Thus, crushed stone sand used for highways and airfields is able to give the required strength to the coating or base. Among other things, it is used to strengthen roadsides. Sand, which is used for ballasting embankments, is used to organize railway tracks of various cross-country ability and traffic flow intensity, which distinguishes the second aggregate from the previous one in that it is intended for general-purpose tracks. In its production, serpentinite crushing technology is implemented. Particles obtained as a result should not exceed 25 millimeters in size.
Crushed stone and sand mixture (GOST 9128-97, must be observed during manufacture) can be used for asphalt concrete mixtures and is a material that is obtained in the process of crushing rocks. The composition is used as the mineral component of the mixture being created. Particles can vary in size from 1 to 20 millimeters.
Key Quality Benefits
C4 crushed stone and sand mixture is often compared with pure crushed stone. The latter is losing in many ways. Among them there is a need to highlight a lower cost, excellent quality of the seal, as well as a fairly simple method of use. Due to the fact that the described mixture contains sand, gravel and gravel, the characteristics of three components affect the final properties of the mixtures at once. Of particular importance is the strength of crushed stone, the maximum value of which is M1400. This parameter assigns fine stone to high-strength materials. It is impossible not to single out the frost resistance that finished sand and gravel mixtures possess. All their brands can be purchased on the building materials market. The most common PSA labeled F300. The content of dusty and clay particles can reach 20%, this parameter should be taken into account when buying material.
Conclusion
Sand and gravel mixture has many positive characteristics, most of them were listed in the article. If you decide to use the described composition for construction, you must first familiarize yourself with the prices. The average cost at the bases of building materials today is about 400 rubles per cubic meter, which can be called an affordable price that any future owner of a private house can afford. And this is one of the advantages of the described material.