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Armed Or Structural Concrete. Which Is?

ARMED or STRUCTURAL CONCRETE. Which is?

Concrete:

As the name says, it is a mass of concrete with a frame of irons (hardware) inside.

When armed with passive fittings, it receives the name of reinforced concrete, and when it is armed with active fittings receives the name of prestressed concrete.

For each cubic meter, 80 to 100 kg of structural steel are used.
For each kg of steel, about 10 g of mooring wire is used.
In the constructions, an average of 12 m2 of shape is used for each m3 of concrete.
And, for each m2 of form, 180 g of nails.


What is prestressed concrete?

Normally, three modalities of prestressed concrete are distinguished:

In the first, the pretension wires are pre-stretched, anchored to special devices, waiting for the concrete of the part to wrap them to reach the desired strength.
Then, such retention devices are removed and the protension is transferred, by adhesion, to the concrete.

In this modality, the pretension wires, as a rule, are straight, excepting some cases of polygonal paths, rarely used. And thus, this type of prestressed concrete lends itself more to the case of precast parts.

reinforced concrete

On Monday procedure is different.
At the outset, the cables, formed by a bar or by the coupling of several special steel wires of pretension, are prepared by an impermeable sheath, preferably metallic.
These cables are then placed in the forms of the future concrete part, and in the positions established by the project.

Concrete that is the piece - being the cables anchored in the ends - and acquiring the concrete the necessary resistance, the protension is realized, through special presses, using as support the own hardened concrete.
Subsequently, the cement cream is injected with the purpose of guaranteeing either adhesion or the protection of the corrosion wires by external agents.

In the third mode, the procedure is the same as that of the second one, with only difference that the cables can pass outside the body of the concrete, the set functioning as a prestressed armed beam.


Video about Belgo Concrete Structure


Armor

Preferably specified by a calculating engineer, the frame of a frame is mounted with longitudinal and transverse rods (stirrups), usually with the diameters of 5, 6, 8, 10, 12,5, 16, 20, 25, 32 and, extraordinarily 40 mm in drawn steel that give tensile strength (if necessary, aid in compression) in the form of a cage.

The stirrups provide the torsion resistance and the transverse stress.

Torsion resistance is also influenced by longitudinal reinforcement.

reinforced concrete

The armor is composed of steel bars, also called building iron or rebar.
They have the property of integrating with concrete and have high tensile strength.
Therefore, they are placed in the parts of the concrete piece that will undergo this effort.

For example, in a beam supported on the ends, the upper part undergoes compression and the lower, traction.
In this case, the rebar should be at the bottom of the beams.

The rebars that make up the armor are tied to each other with annealed wire.

There are also prefabricated reinforcements, which already come with rebar joined together: they are welded screens, which serve as reinforcement for slabs and floors.

Most rebar have protrusions on the surface.

The Brazilian Technical Standards classify concrete rebar according to their strength and standardize the gauges.

There are 3 categories in the market: steel AC 25, steel AC 50, steel CA 60. The numbers 25, 50 and 60 refer to the strength of steel: the larger the number, the more resistant the rebar.

reinforced concrete

From Wikipedia, the free encyclopedia
Armed Or Structural Concrete. Which Is?

FAQ - 💬

❓ What is the structural concrete?

👉 concrete, in construction, structural material consisting of a hard, chemically inert particulate substance, known as aggregate (usually sand and gravel), that is bonded together by cement and water.

❓ Which is better structural steel or reinforced concrete?

👉 Between structural steel vs reinforced concrete, structural steel offers higher strength, fire resistance, and excellent recyclability. Reinforced concrete, on the other hand, uses far more affordable materials.

❓ What is structural concrete used for?

👉 1. Concrete, of a specified quality, which is used to carry a structural load or to form an integral part of a structure.

❓ What is a structural concrete floor?

👉 A: A structurally reinforced slab-on-ground uses a composite of concrete and structural steel to support the design load. Structural steel may be rebar or WWF. The cross-sectional area of the steel is inserted into engineering formulae found in ACI 318 to determine the load carrying capacity for a given slab design.

👉 The steel, in general, has 60 percent less weight compared to concrete. Reinforced concrete structure possesses huge dead weight which hence demands a strong foundation to support. Steel structures do not demand heavy foundation. In RC structures, the tensile strength of the concrete elements is less compared to steel structural elements.

👉 A concrete structure is mainly made of concrete, including plain concrete structure, reinforced concrete structure, prestressed concrete structure, etc.

👉 Let’s first look at the characteristics of these two structures. The concrete structure is composed of steel bars and concrete. It has the features of self-heavy weight, strong integrity, resistance to superficial erosion, good airtightness. But a long construction period. The steel structure is formed by connecting steel components.

👉 The construction of reinforced concrete structures is labor-intensive. Construction of steel structures requires less labor. Most of the components are fabricated in the workshop and assembled at the site.

Video Editorial: Why Concrete Needs Reinforcement