Building Materials

Specifications of expanded clay that you need to know

The main technical characteristics of expanded clay

As you know, in houses made of burnt bricks much warmer than in concrete. The property of clay treated with high temperatures is that it becomes a very poor conductor of both heat and cold. Ceramsite has the same property to a somewhat greater extent, thanks to its porous structure. But how high is its thermal conductivity? If you want to use this material as a thermal insulation, this question should interest you first. We hasten to please you - the thermal conductivity of claydite is quite small and is 0.12 W / mK.However, the size of the fractions should be taken into account, this characteristic for porous sand with a particle diameter of 0 to 5 millimeters is not even considered.

Among other things, expanded clay has several properties, thanks to which, and so quickly won the popularity of homeowners and some developers. First, it is its strength. In compression tests, the pellets were mutually destroyed only by 13% of the volume, th

us creating an additional compaction of the layer. Dense laying without impact of the load provides a volume reduction of 7%.Other technical characteristics of expanded clay are also important. For example, the material is absolutely not afraid of water. In combination with frost resistance, this allows you to count on the durability of the backfill. Regarding the radiation quality, which is so exciting today, keramzit is completely neutral, amounting to 200-240 Bq / kg.

What is the density of expanded clay, and how important is this parameter?

Bulk insulation can be used in walls, ceilings or even roofing, however it is important to know how dense will be laying when using a particular fraction. Expanded gravel from burnt low-melting clays has about a dozen marks, each of which determines the bulk density of expanded clay. But, often, with these or other sizes of granules, the actual figures are even less than required. In particular, the M450 grade for fractions of 10-20 millimeters has a density of 430-440 kg / m3, and the M500 is only 460 to 470 kg / m3.For expanded clay sand brands are installed at higher rates. Thus, the M800 has a bulk density within the range of 740-760 kg / m3.

The ratio of the largest granule to the lowest in one batch of expanded clay should not exceed 1.5, increasing this value to at least 2 will reduce the strength of grain by 27%.

The quality of the material is of no small importance, since it determines the shape of fractions. Ideally, they should be spherical, in this case the centers of the triangles laid by the triangle will be equidistant from each other. This is how you can distinguish high-quality expanded clay, the properties of which are determined by the uniform arrangement of pores, completely closed. In the cutting of such granules, you can see pronounced glassy walls of voids, ideal, without any disruption of integrity. The high strength of grains of expanded clay gravel is caused by such a structure, and the shape obtained from crushed stone is angular, and its quality is much worse.

Bulk and specific weight of expanded clay - important characteristics of

As any bulk insulation occupies a certain volume, it is not difficult to calculate how many cubic meters it will take to increase the thermal insulation of ceilings, walls or roof slopes. However, it is also desirable to know the bulk or specific weight of claydite, which, in fact, is one and the same. The difference is observed only when different material sizes are compared. Ideally, the specific gravity of the expanded grain is 0.95 g / cm3 .It is reached at a temperature of 1250 degrees, while the interval from the moment of swelling to refining the surface of the granules should not exceed 50 degrees.

The volumetric weight depends on many factors. Firstly, this is the grain size, for example, a cubic meter of pellets of 20 to 40 millimeters will weigh about 350 kilograms, and expanded sand with a diameter of 0-5 millimeters fraction is 600 kilograms. The raw material plays an important role, because clays can be heavy and light. Stamps of the same size but different in weight granules are distributed according to the composition of the clay. Sometimes transportation of a large distance of expanded clay with a bulk density of 350 kg / m3 is more profitable than manufacturing the same material near the place of use, if in the latter case the weight of the cubic meter exceeds 600 kilograms.