aspect ratio and step-by-step instructions- Review + Video

aspect ratio and step-by-step instructions- Review + Video Heat-resistant concrete is a type of concrete that is used under long-term exposure to high temperatures (no more than 1580 ° С , refractory up to 1770 ° C), while not losing its mechanical and operational qualities.

It is used in the construction of both industrial and residential buildings. Heat-resistant and refractory concrete is used to make home heating stoves, barbecues, baths, saunas, fireplaces and chimneys.

[contents ]aspect ratio and step-by-step instructions- Review + Video

The difference between heat-resistant and refractory concrete from ordinary concrete is that the latter withstands only short-term heating of temperature not higher than 200 ° С.

At higher heating the concrete dries out, cracks and eventually collapses, which leads to the failure of the entire structure.

Application of heat-resistant concrete

aspect ratio and step-by-step instructions- Review + Video The composition of heat-resistant concrete includes special additives and mixtures that give the material significant strength when exposed to high temperatures.

During operation, refractory concrete acquires even greater resistance to heat. A big plus is the fact that heat-resistant concrete does not require expensive special firing, therefore it is widely used in construction.

In principle, it does not differ from ordinary concrete and can guarantee complete safety and protection of your structure from overheating. In addition, refractory concrete can be used as thermal insulation material.

aspect ratio and step-by-step instructions- Review + Video Cellular, lightweight or dense concrete is divided depending on the area of ​​application. Light material is considered when in a dried state its weight is not more than 1500 kg / m3. Finely ground impurities, such as fireclay bricks, lump fireclay, pumice, magnesite bricks, andesite and others, are added to the basic raw materials of Portland slag cement, Portland cement, alumina cement or liquid glass. Additives promote the hardening of refractory concrete and form its refractory properties.

Refractory concrete on phosphate and silicate bonds

There are so-called special refractory concrete.

This is when, in addition to the alumina-cement bond, a silicate or phosphate base is added to its composition. Phosphate-bonded refractory concrete adheres better to other refractories, hardens faster and has a higher strength than alumina-cement concrete. The hardener is cement, talc, magnesium oxide. The filler is high-temperature materials: corundum, broken corundum and high-alumina refractories, chromites and chromomagnesites. aspect ratio and step-by-step instructions- Review + Video

Refractory concretes on a silicate bond are used in an acidic environment.

To increase the hardness add sodium silicate, sodium fluorosilicate, phosphates.

Quartz sand, high-silica chamotte serves as a filler.Due to its increased resistance to acids, silicate-bonded refractory concrete is usually used for chimney in pickling baths, tanks, pipe lining.

If you decide to build a brazier, a fireplace or a stove in the house with your own hands from heat-resistant concrete, then in order to save money during construction, you can easily do it yourself. To do this, use a ready-made dry mixture or mix the ingredients using a special technology, similar to the preparation of ordinary concrete.

Factory mixes are made according to all standards and can guarantee product quality. When using the ready-made dry mixture, carefully read the instructions on the package and strictly follow it.

aspect ratio and step-by-step instructions- Review + Video

The technology of manufacturing refractory concrete is divided into two types: If the structure will be exposed to moisture, do not add liquid glass, if the environment is acidic and aggressive, do not use Portland cement. aspect ratio and step-by-step instructions- Review + Video

Determine the work site, make sure water is available and tools are clean.

Production of refractory concrete

The standard composition of refractory concrete includes: sand, gravel, slaked lime, heat-resistant cement.

In proportions, respectively, 3: 2: 2: 0.5. Pure filtered water requires 7.7 liters for 22.5 kg of mixture.

Use a shovel to mix the sand and gravel well in a wheelbarrow, or use a concrete mixer.

aspect ratio and step-by-step instructions- Review + Video Then fill the mixture with water until it reaches the desired consistency. Transfer the mixture to the finished mold or casting, level the surface with a trowel and remove excess concrete. The faster you work, the denser the solution will be.

Use a hammer drill or a jackhammer to remove voids and air bubbles in the refractory mixture.

Insert the drill into the wooden part of the mold and work for one minute. Next, the finished mixture must be covered with foil and left for a couple of days, occasionally sprinkling with water. Transfer the finished refractory block indoors and leave for 25 days.

You can use plywood to make castings. For easy removal of the refractory block, polyethylene is placed on the bottom of the mold, or, at best, greased silicone, which will not prevent water from evaporating from the block surface.

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