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By
Er. Vaishnav C R Nair
Introduction
The slabs are made depressed in depth form the general floor level in wet area like toilets, balconies, wash area in kitchen etc. This is to ensure the wet and dry area separations in buildings. Even though the sunken slabs provided the toilet and balcony areas are found with a major quality problem of Dampness. This is due to the continues contact of water with building blocks. Here comes the importance of Kerb Construction.
By
Sourav Dutta
Manager-Civil
Brand embossing
On rebar pieces, different items are encrypted in the following manner:
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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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.
By
Sourav Dutta
Manager-Civil
Common Hazards/issues normally countered at all construction sites:
Human error in rebar fabrication (manual).
Fig 1 : Incorrect bend
Compromise with safety and quality.
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
Rebar pilferage.
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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
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:
