Fraction of crushed concrete

A versatile material that is frequently used in landscaping and construction is crushed concrete. It is created by recycling and processing demolished buildings to produce aggregate in a range of sizes. When choosing the proper type of concrete for a project, such as installing a new driveway, constructing a foundation, or constructing a garden path, it is helpful to understand the fraction of crushed concrete.

The size of the pieces after the concrete has been sorted and crushed is referred to as the fraction of crushed concrete. Because different projects require different sizes, this classification is essential. Larger pieces could be used, for instance, for foundational work, whereas finer fractions are best for smoothing surfaces.

Recycled concrete lowers waste and material costs at the same time. It’s a sustainable option for building that is also good for the environment. You can guarantee the efficiency and environmental friendliness of your project by choosing the right percentage of crushed concrete.

Functions of crushed stone in concrete

Big filler in the mixture of concrete:

• prevents the formation of a water layer around cement and sand particles, which reduces the strength of the concrete;
• reliably adheres to the components of the solution due to its uneven surface – after gaining strength, the mixture turns into a monolith resistant to high loads;
• increases the waterproofing properties of concrete, as it does not allow water to pass through;
• increases the elasticity of the building material, resistance to cracking, reduces shrinkage and deformation of concrete when drying;
• reduces the consumption of cement (the most expensive component of the mixture) without reducing the strength of the finished material.

Characteristics of crushed stone

Crushed stone with the right properties must be used for concrete structures to have the necessary strength. The material’s subsequent attributes are assessed:

• type of crushed stone;
• strength;
• fraction;
• frost resistance;
• grain shape (bream);
• ability to adhesion (clutch).

Types and strength of crushed stone

Crushed stone such as granite and gravel are most frequently used in the production of concrete. Large filler can also be obtained by disposing of old concrete (secondary crushed stone) and other rocks (serpentinitis, amphibolite, limestone, dolomite, etc.).

Granite is a long-lasting crushed stone that is utilized for heavy concrete meant for important tasks. Because gravel crushed stone is much less expensive and less durable, it is used to make concrete for buildings that won’t be subjected to increased loads. Crushed limestone can be found in low-grade concrete (M100, M150).

The grade of concrete is impacted by the filler’s strength. You should think about the class to which the finished product should belong when selecting crushed stone. Crushed stone’s ability to withstand temperature fluctuations is indicated by its frost resistance, which is directly correlated with strength.

The strength characteristics of concrete are also influenced by the grain shape. You can obtain a material with a high density by using cubic grains. Concrete with a lot of crushed stone particles shaped like cones is of lower quality.

Crushed stone is the worst option because it has a lot of needle- and plate-shaped stones in it. Crushed stone with high flakiness is the name given to this type of filler, which prevents the concrete mixture from compacting well.

Crushed stone adhesion is related to the flakiness and kind of rock that makes up the bulk material. Higher adhesion is a characteristic of filler with a rough surface than smooth particles.

Crushed stone fraction

Additionally, the qualities of the concrete mixture and the finished product are significantly influenced by the size of the grains. The purpose of the building material dictates which fraction of crushed stone to use in the concrete.

Fractions can be categorized into three groups based on grain size:

• small (5-20 mm);
• medium (20-40 m);
• large (from 40 mm and more).

Because crushed stone can effectively fill voids, it is highly sought after for concrete of fractions 5–20. For any kind of work, concrete mixtures contain this kind of filler.

Medium-sized crushed stone is added to heavy concrete that is meant for important tasks, such as building homes and businesses. Concrete for foundations is made using these crushed stone fractions.

When constructing structures that are subjected to high loads, concrete compositions often include filler of substantial fractions.

Note: Crushed stone of two or three fractions is added to the mixture to produce the highest quality concrete. By doing this, you can prevent voids from forming and produce a material with high strength that can withstand heavier loads.

Crushed stone in the concrete mixture

Concrete M100

Possesses comparatively little strength and is not meant for labor-intensive tasks. used to pour basement floors and to prepare the ground for sidewalks, roads, and foundation structures. The mixture can be made using recycled crushed stone or limestone.

Concrete M150

Refers to medium-strength concrete, which is used in private construction for various auxiliary tasks such as setting up screeds, preparing the base of platforms and paths, and concreting supports and pillars to create monolithic light-loaded foundations. Crushed stone or limestone can be used as the filler.

Concrete M200

Medium-strength heavy concrete that can be used for laying low-rise building foundations, stairs, platforms, blind areas, pathways, etc. Filler materials include crushed stone and gravel. The crushed stone fraction in concrete M200 ranges from 5 to 40 mm.

Concrete M250

Heavy concrete that is sufficiently strong is used in civil and industrial construction to create load-bearing reinforced concrete structures, pour concrete pads, sidewalks, and roadways, and arrange foundation bases for different loads. Gravel or crushed granite stone is used as filler.

Concrete M300

A kind of heavy concrete that is widely utilized in private construction because of its high technical specifications and reasonable cost. Ideal for setting up floors and stairs, building pillars, blind spots, monolithic low-rise structures, and foundations. Crushed stone fraction for concrete M300 is a blend of two or three fractions with a thickness ranging from 5 to 40 mm.

Concrete M350

For the construction of vital structures intended to support heavy loads, heavy concrete is used. Once the material has strengthened, it can withstand outside forces. This grade of concrete is used to create road slabs for airfields, wall structures, floor slabs, and supporting columns. The granite crushed stone fraction for M350 concrete consists of a blend of two or three fractions with grains ranging in size from 5 to 70 mm.

Concrete M400

A kind of heavy concrete that has a high Portland cement content, guaranteeing its high compressive, tensile, and flexural strengths. It is employed in the construction of vital structures, such as high-rise monolithic buildings, hydraulic structures, load-bearing structures, and road infrastructure (bridges and overpasses). Granite crushed stone, a blend of various fractions, is used to prepare the mixture.

Concrete M500

For the creation of the most important structures, concrete of this grade and higher is made to special order. This material is pricey and contains a significant amount of Portland cement. Crushed stone made of hard rocks, such as granite, amphibolite, and serpentinite, makes up the filler.

Conclusion

The GOST requirements must be met by the crushed stone fraction used in concrete in order to ensure the quality of the building material. Depending on the deposit, other features of a particular natural material are also taken into consideration. Every batch of crushed stone must have its characteristics determined by the manufacturer, and it is the customer’s responsibility to verify that the parameters are met.

The question of which crushed stone fraction is best for concrete cannot be answered. The decision in each particular instance is based on the grade of material that must be acquired.

Choosing the appropriate material for your construction project requires an understanding of the various crushed concrete fractions. Whether you’re working on a road, foundation, or any other application, you can guarantee the longevity and stability of your structures by selecting the right size and kind of crushed concrete.

Every component of crushed concrete has a distinct function. Whether you’re using smaller particles to build a solid base or bigger aggregates for drainage and load-bearing applications, understanding how to use these materials well can have a big impact on how your project turns out.

Furthermore, recycling crushed concrete helps your project and promotes environmentally friendly building methods. It can even save costs while lowering waste and conserving natural resources. The construction industry will have a more sustainable future if it adopts these eco-friendly materials.

Spend some time thinking through the particular demands and specifications of the project when you organize your next construction project. Achieving the best results and guaranteeing durable, high-quality construction can be accomplished by carefully choosing the appropriate fraction of crushed concrete.

Based on particle size, crushed concrete, a flexible and sustainable material, can be divided into several fractions, each with a specific use in building. Understanding these fractions helps maximize the material’s efficiency and environmental benefits, from fine particles perfect for road base and leveling to larger chunks perfect for structural fill and erosion control. This essay will examine the different crushed concrete fractions, their particular uses, and the benefits they provide for contemporary building methods.

Video on the topic

Concrete from professionals. Film 4. Large aggregate.

Crushed stone for the foundation. Which crushed stone to choose. Types of crushed stone.

This is what Crushed stone looks like 3 tons, fraction 5-20, according to the documents, the weight is 3060 kg.

Which select crushed stone fraction?