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Different tests for rebar

By
Sourav Dutta
Manager-Civil

Brand embossing
On rebar pieces, different items are encrypted in the following manner:

Brand embossing

Here, X = Dia of rebar in mm, eg, 20
ABCD = Brand of rebar, eg, TATA TISCON / SAIL / JSPL etc
Y = Yield stress of rebar, eg, 500 indicates Fe500 with yield stress=500 Mpa
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Formwork : Critical points to take care during construction

By
Sourav Dutta
Manager-Civil

Design and construction:
The design and construction of formwork should take account of safety and of the surface finish required. The formwork should be sufficiently rigid and tight to prevent loss of grout or mortar from the fresh concrete, during its placing and construction.

Formwork and its supports should maintain their correct position and be to correct shape and profile so that the final concrete structure is within the limits of the dimensional tolerances specified. They should be designed to withstand the worst combination of self-weight, reinforcement weight, wet concrete weight, concrete pressure, and construction and wind loads, together with all incidental dynamic effects caused by placing, vibrating and compacting the concrete.

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Readybuild: Pre-fabricated rebars ready-to-fix at site leading to faster construction

By
Sourav Dutta
Manager-Civil

Common Hazards/issues normally countered at all construction sites:

Human error in rebar fabrication (manual).
Fig 1 Incorrect bend
Fig 1 : Incorrect bend

Compromise with safety and quality.

Fig 2 Safety and Quality issues upon using rebar cutter
Fig 2 : Safety and Quality issues upon using rebar cutter

Procurement schedule delays affecting site progress, and thereby delaying project completion.

Inventory management. Capital locked in inventory.
Fig 3 Lack of space at site affects storage procurement
Fig 3 : Lack of space at site affects storage/procurement

Rebar pilferage.
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Higher Diameter Reinforcement- Leading to faster/cheaper construction

By
Sourav Dutta
Manager-Civil

The first version of BIS 1786 came out in 1985 when in Cl.5.1, the code suggested the nominal sizes as shown below:

Fig 1 (s) BIS1786-1985 and the relevant clause
Fig 1 (s) BIS1786-1985 and the relevant clause1
Fig 1 (s) : BIS1786-1985 and the relevant clause

The next version of the code BIS 1786 was introduced in 2008, where nominal sizes were rationalized and nominal sizes 7 mm, 18 mm, 22 mm, 45 mm and 50 mm had been removed. In Cl. 6.1, the code had suggested the nominal sizes as shown below:

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Higher grade reinforcement: Path to future

By
Sourav Dutta
Manager-Civil

The first version of BIS 1786 came out in 1985 where in Cl.1.1, the code had put the detailed physical and chemical properties, testing procedures of following strength grades of HYSD (High Yield Strength Deformed) bars/wires as shown below:

Fig 1 (s) BIS1786-1985 and the relevant clause

Fig 1 (s) BIS1786-1985 and the relevant clause1
Fig 1 (s) : BIS1786-1985 and the relevant clause

The next version of the code BIS 1786 was introduced in 2008, where new strength grade Fe600 had been introduced. Also, two categories based on elongation for each grade except Fe600 had also been introduced. Thus in Cl.1.1, the code had put the detailed physical and chemical properties, testing procedures of following strength grades of HYSD (High Yield Strength Deformed) bars/wires as shown below:

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