The choice of the foundation under the house and the reinforcement frame depends on the characteristics of the soil and the material for the erection of the house. Traditionally, the reinforcement is carried out by the armature of class AI-AIII.
Not so long ago, the composite fittings were brought to the market.
The use of fiber-reinforced fibers and the reinforcement of steel fiber as a main element and auxiliary is becoming popular.
This is the traditional material for framingFoundation constructions. It is used in tape foundations, pile, columnar and prefabricated reinforced concrete. Armature class AI is used to create a reinforcing cage in the foundations for "light" houses: frame, wooden, less often for houses made of foam concrete and aerated concrete, other lightweight structures. This is due to the fact that the reinforcement AI has a circular section in diameter and a smooth surface. Because of this, its adhesion to concrete decreases. Diameter of used reinforcement from 6 mm and above. It is calculated at the design stage of the house.
Class AIII fittings are made ofAlloy and high-quality steel with increased strength characteristics. In section it is ribbed. The surface pattern can be of several types: annular, crescent or mixed. Reinforcement with an annular profile is designed for massive structures due to the large adhesion to concrete. The crescent-shaped armature can be used in structures experiencing fracture loads. With tensile loads, use a reinforcement of a larger diameter.
The diameter of the reinforcement is considered at the project stage. For "light" houses with a relatively small weight, a valve of 8-10 mm in diameter or 6 mm in mounting is allowed. In houses with walls of great weight for reinforcing foundations, reinforcement with a diameter of 12-14 mm is used.
The reinforcement of non-carbon steels can be weldedWhen preparing the foundations. Welding of carbon steel reinforcement is not recommended. The place of welding will be brittle. It is better to knit the reinforcement with a knitting wire.
The armature is produced in coils and in the form of rods. Coils supplied armature diameter of 6-10 mm. Reinforcement with a large diameter is supplied in rods. The standard length of bars: 6 m, 9 m, 11,7 m. The maximum diameter of the produced reinforcement is 32 mm.
Its main advantage is a considerableCorrosion resistance and inertness to any corrosive environments. Such characteristics make it possible to reduce the diameter of reinforcement when reinforcing foundations without reducing the strength of the structure as a whole. Using composite reinforcement will make it possible to reduce the protective layers of concrete. Estimated and expected durability is expected to be about 75 years. According to the materials, the composite reinforcement is divided into: glass, basalt, Kevlar.
The advantages of composite reinforcement: Strength is higher by 1.5 times than in steel, is not susceptible to corrosion and is lighter than steel in 3,0-3,5 times. It has dielectric properties and is radio transparent. Frost resistant. The coefficient of thermal expansion (CTE) of composite reinforcement is equal to the CTE of concrete. At weight of advantages one technical disadvantage is low heat resistance.
Composite reinforcement is more expensive than usual. But there will be an article saving on the diameter of the used reinforcement. To reduce costs, you can use a concrete foundation when, when pouring concrete, a large aggregate is added: bricks and quarry stones, rubble and gravel.
Material that is gaining popularity when pouringFoundations - a concrete, reinforced with fiber. The properties of concrete depend on the type of fibers. Fiber concretes are used for pouring ribbon foundations and for complex reinforcement to improve the quality of the foundation.
To reinforce the concretes add fibro differentSpecies. Fiber is a waste product of nailing and cutting steel wire for steel fiber. Basalt fiber is made from basalt fibers. Similarly, glass fibers and fibers of polymers, in particular polypropylene, can be added to the concrete. Add textiles.
Adding fiber increases impact resistance toFantastic 500%, and abrasion by 50%. In this case, the propylene fiber will be enough 900 grams per 1 cu. M of concrete, or 20-50 kg of steel fiber per 1 cubic meter. M.
These additives are designed to perform the function of reinforcement inConcretes, increase crack resistance, resistance to deformations. Improved qualities such as frost resistance and water resistance. Adding fiber to concrete facilitates the weight of the structures from it. Composite binders and modifying additives are added together with fiber of various nature into fiber-reinforced concrete. All together gives the concrete a completely new properties, which allows you to significantly reduce the construction time and save material consumption.