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Loose Materials

August 12, 2017 18:05

expanded clay aggregate

Expanded clay - building material, manufactured in accordance with GOST 9757-90 from clay or shale by firing.For the production of such types of clays are used, which are considered to sediments.The variety of minerals included in their composition, allows at temperatures above 1050 ° C to achieve cavitation.The main varieties of clay, reaching for the production of expanded clay, montmorillonite and hydromica considered.So to answer the question, what is the concrete block, we can say that it is an environmentally friendly material made of clay.


  1. Scope
  2. Features material
  3. Specifications keramzita
  4. properties of expanded clay
  5. Video


use of this building material is practically knows no bounds.Firstly, this construction.It is practiced as a separate application in the form of expanded clay backfill heater or as part of expanded clay.Secondly, it is agriculture.It is an indispensable component in the cultivation of fruit and ornamental plants hydroponically.Thir

d, the domestic floriculture.From the expanded clay gravel obtained excellent drainage.He also used when placing and insulation of lawns and flower beds.Even the soil in terrariums should contain this substance.

Features material

expanded clay composition ensures good thermal insulation properties of the material.Therefore, it is considered the most suitable material for sustainable building construction and for agriculture.Only use each direction requires a certain fraction of this building material.Today, common 3 types of fractions:

  • gravel (or oval or round shape);
  • rubble (characterized by the presence of corners, edges);
  • sand.

The photo and video can visually track the difference between the above species.

Specifications keramzita

Specifications of expanded clay (ultimate strength, density) are the basis for the selection of several grades of this material.For example, in accordance with the level of density is accepted to allocate 10 varieties.Mark with a bulk density of 250 to 250 kg / m3, the mark 300 has a value of density 250 - 300 kg / m3.Next come the brand 350, 400, 450, 500, 600. Less common brand 700, 800, because their production is only available upon request.When you purchase is necessary to take into account that there are differences between the bulk density and bulk density: the first index exceeds the second is about 2 times as the true density is calculated without taking into account the gaps that exist between the individual particles.

strength of the material is also the basis for the allocation of marks.To distinguish 13 grades of gravel and crushed stone 11 brands.Durability is determined by squeezing a cylinder.She has a letter and number designations that are identical in gravel and crushed stone.GOST 9757-90 regulates the relationship of the strength and density of all grades of material.The higher the density, the higher the strength.

rate of water absorption of the material has a performance of 8% to 20%., So it can be considered sufficiently resistant to water.

thermal conductivity figures are in the range of 0.10 - 0.18 W / (m • K).This ratio may be very slight fluctuations, this fact is objective evidence of a good ability to retain heat.The higher the density of the material, the higher the thermal conductivity, because the high density indicates fewer pores and air contained therein, which has excellent thermal insulation properties.

Frost resistance of the material allows it to operate for at least 25 years, but in each class its properties, its ability to withstand low temperatures.However, digital markings frost does not exist.

properties of expanded clay

Regardless of the species expanded clay has a number of general advantages:

  1. strength;
  2. good thermal insulation properties;
  3. chemical inertness;
  4. resistance to acids;
  5. environmental friendliness;
  6. fire resistance;
  7. moisture resistance;
  8. frost;
  9. low price.

of consumers who used the expanded clay for construction purposes, evidenced not only by the merits of the material, but also its shortcomings.In particular, it is noted that it is necessary to use waterproofing, if this material is used for floor screeds in wet areas.The waterproofing layer is laid under the concrete block to protect it wet.It is also noted that only a thick layer of the material can give a good sound insulation and heat insulation.