It is Concrete without any rebar and it is used in works of the concrete mattresses under the foundations and also in producing the blocks which arenØµt subjected to the tightening stresses in addition to the works of grounds and dams. The strength of the Concrete Plain ranges from 150 kg \ cm2 to 200 kg \ cm2.
It is ordinary concrete with rebar to resist the tightening stresses. In this type of concrete the Compatibility and Equilibrium between the stresses and strains in both of rebar and concrete shall be taken into consideration. The strength of the Reinforced Concrete ranges from 250 kg \ cm2 to 400 kg \ cm2.
High Strength Concrete
The strength of this Concrete is more than 600 kg \ cm2. This concrete can be obtained by usage of additional materials such as the Super Plasticizer to reduce the mixing water to the maximum degree with getting the same ability for operation and then getting high strength.
Concrete High Performance
This Concrete has specified qualities and characteristics allow it to work in particular environment and conditions and these characteristics may include the characteristics of the Fresh Concrete ( able to be operated and soft) or the characteristics of Hardened Concrete ( resisting the sharpening, scratching, frost and retraction). These characteristics may be combined or separated to give performance different from the Ordinary Traditional Concrete. The Concrete High Performance doesnØµt require high strength.
This concrete includes Fibers distributed regularly in all directions through the concrete block. The Fibers have the ability of improving the strength of the concrete in the tightening, bending, cutting, collision, retraction and reducing the extension of the cracks. The most important characteristics of the fibers represented in increasing the value of strength greatly.
It is mixture consists of Cement and sand with proportion of 1:4 approximately added to it water to get the appropriate operating degree. This concrete is pumped by the compressed air to the surface required to be lined and this concrete is used in the works of reparation and lining the tunnels.
Light weight concrete
The weight of this concrete is less than 2000 kg\m3. this concrete is used for reducing the weight of the construction, hence reducing the costs of foundations. There are three types of the Light weight concrete: Fine less concrete Aggregate Light weight Cellular concrete
It is concrete of great Masses and aggregate of great size is used in it. The Mass concrete is used in the concrete of dams and ground tanks.
Air Entraining Concrete
This concrete is easier in the operation and has high resistance to the weather specially the frost. This concrete includes proportion of the entrained air ( as result of usage of some additions Ø° fumes or materials produce the hydrogen when it reacts with the cement, Ammonium powder or Zink).
Under Water Concrete
It is concrete poured under water and has the ability of hardening under water quickly with keeping its strength.
Concrete with Micro silica \ Flay ash \ Pozzolana \ Slag.
There are some cement materials added to the concrete with specific proportions to get concrete with specific characteristics such as resisting the salts, chlorides, reducing the penetration and increasing the continuity and strength of concrete.