Tashkent Pipe Plant named after V. L. Galperin Brings its Development, a New Type of A550CK Reinforcing Steel to the Market.

The A550CK reinforcing steel has a number of distinctive properties:
– increased corrosion resistance, higher tensile strength and yield limit;
– lower metal consumption in building structures;
– increased plastic properties, which allows it to absorb the energy of seismic impact and prevent the destruction of buildings located in seismically active areas of Uzbekistan.

Such reinforcement has good strength characteristics and can withstand large deformations during earthquakes.

The new type of A550CK class reinforcing steel will allow developing more cost-effective design solutions, including optimizing the prime cost of frame construction work by 4.5%, in building structures, cost reduction reaches up to 10% on a tonnage basis.

Builders of Uzbekistan Will Expand the Use of A550CK Class Reinforcing Steel

 

 
Construction companies of Uzbekistan are expanding cooperation with the Joint Venture Tashkent Pipe Plant named after V.L. Galperin. In particular, the cooperation will be aimed at the use and introduction of a new type of A550СK reinforcing bar, as well as other innovative products in various construction projects.
 
The A550CK reinforcing steel is made of the same steel grade as the A500C, but has a number of distinctive properties, namely increased corrosion resistance, higher tensile strength and yield limit, lower metal intensity and other characteristics. Compared to the traditional A500C reinforcing steel, the consumption of the A550CK in a building structure can be reduced by up to 10% on a tonnage basis.
 
Currently, on the initiative of the JV Tashkent Pipe Plant named after V.L. Galperin, the Research Institute of Technical Regulation and Standardization in Construction under the Ministry of Construction and Housing and Communal Services of the Republic of Uzbekistan has developed the National Standard OʻzМSt 193:202_ “CLASS A550СК THERMO-MECHANICALLY TREATED REINFORCING BAR”. The study and testing of class A550СК reinforcing bar have been conducted in two independent accredited laboratories. The parameters specified by the National Standard have been confirmed during testing of the class A550СК reinforcing bar manufactured by the plant.
 
STANDARDIZATIONmore detailed
JV Tashkent Pipe Plant named after V.L. Galperin is bringing its development to the market in June 2024. The new type of class A550CK reinforcing steel will allow developing more cost-effective design solutions, including optimizing the cost of frame construction work by 4.5%. In addition, this reinforcing bar has increased plastic properties and is therefore recommended for use in earthquake-resistant structures.
 
However, to use the class A550CK reinforcing steel widely, appropriate additions should be made to urban planning norms and rules as soon as possible.

By Using A550CK Reinforcing Bar Instead of A500C, You Can Reduce Reinforcement Consumption by up to 10% on a Tonnage Basis and the Prime Cost of Frame Construction Work by 4.5%

 
Most reinforced concrete structures are in bending. These are beams and slabs, which are subject to loads perpendicular or at an angle to the beam axis or slab plane.
 
When performing strength calculation, the determination of ultimate forces in such reinforced concrete structures is made based on a number of assumptions. In particular: the tensile strength of concrete is taken to be zero. Accordingly, the entire tensile load will be taken up only by reinforcement bars. The yield strength is taken as the standard resistance of the reinforcement bars.
 
Using conventional hot rolling technology, in accordance with technical conditions of GOST 34028-2016 and O’z DSt 3025:2015, metallurgical plants manufacture class A500C reinforcing steel with a yield strength of at least 500 N/mm2.
 
Using the new technology, our enterprise produces reinforcing steel for reinforced concrete structures from the same steel grade in accordance with the technical conditions of OʻzМSt ______:202_ strength class A550СК with a yield strength of at least 550 N/mm2.
 

 
Let us consider the design of a reinforced concrete beam.
 
For example, when a beam bends, the tensile load is taken up by six Ø12 mm reinforcement bars. The total standard resistance of the reinforcement bars of the beam is: P=n x F x ơ02, where n is the number of bars, F is the cross-sectional area of one reinforcement bar, and ơ02 is the yield strength.
 
For the six Ø12 mm reinforcement bars of A500C class, the total standard resistance in the tensile region of the beam is: P = 6 x 113.1 x 500 ≈ 339,000 (N).
 
In case of the A550CK class reinforcing bars, it is possible to use only four Ø14 mm reinforcement bars, since the total standard resistance in the tensile region of the beam will be: P = 4 x 153.9 x 550 ≈ 339,000 (N).
 
Thus, if you planned to use 100 tons of A500 class reinforcing steel in a reinforced concrete structure with an estimated cost of ≈1.77 billion soums, then when using A550CK class reinforcing bar, you will need 100 x (4 x 153.9): (6 x 113.1) = 90.7 tons. That is, you reduce the consumption of reinforcement by 9.3 tons or by 9.3%.
 
Since the cost of one ton of A500C class reinforcing steel and that of A550CK class reinforcing steel are the same and is ≈ 8,570,000 soums per ton, your financial savings will be:
9.3 x 8,570,000 = 79,701,000 soums or (79,701,000 / 1,770,000,000) x 100% ≈ 4.5% of the estimated cost of frame construction work.