Some Ideas to Remember for Civil Site Engineer: Civil Engineering Guidelines

"Civil engineers perform a variety of operations on construction sites, and certain tasks are performed on a regular basis in nature. So, here are certain ideas, principles, and actions that a civil engineer should keep in mind for faster calculations and quicker responses to building site challenges."

Facts to Remember for Civil Site Engineer

The following are a few general considerations for civil site engineers to remember in order to make construction work easier while preserving construction quality.

• Bars with diameters more than 36 mm does not require Lapping
•  Chair spacing maximum spacing is 1.00 m (or) 1 No per 1m².
• Minimum of 12 mm diameter should be used for dowels rod.
• Minimum of 12 mm diameter bars to be used for chairs.
• Longitudinal reinforcement not less than 0.8% and more than 6% of gross C/S.
• Minimum bars for the square column are 4 No’s and 6 No’s for the circular column.
• Main bars in the slabs shall not be less than 8 mm (HYSD) or 10 mm (Plain bars) and the distributors not less than 8 mm and not more than 1/8 of slab thickness.
• Minimum thickness of the slab is 125 mm.
• Dimension tolerance for cubes + 2 mm.
• Free fall of concrete is allowed a maximum of 1.50m.
• Lap slices not be used for bars larger than 36 mm.
• Water absorption of bricks should not be more than 15 %.
• PH value of the water should not be less than 6.
• Bricks have a Compressive strength of 3.5 N / mm^2.
• In steel reinforcement binding wire required is 8 kg per MT.
• In soil filling as per IS code, 3 samples should be taken for core cutting test for every 100m².

Materials Density

·         Bricks 1590 – 1920 kg/m3

·         Concrete block 1950 kg/ m3

·         Reinforced concrete 2210 – 2700 kg/ m3

·         Super Sulphate cement: 7 days

Curing time of RCC Members for different types of cement

• Ordinary Portland cement OPC: 10 days
• Minerals & Admixture added cement: 14 days

De-Shuttering time of different RCC Members

RCC Member	De-shuttering time
For columns, walls, the vertical formworks	16-24 hrs.
Soffit formwork to slabs	3 days (props to be refixed after removal)
Soffit to beams props	7 days (props to refixed after removal)
Beams spanning up to 4.5m	7 days
Beams spanning over 4.5m	14 days
Arches spanning up to 6m	14 days
Arches spanning over 6m	21 days

 

Cube samples are required for different quantities of concrete

 

Quantity of Concrete	No. of cubes required
1 – 5 m3	1 No’s
6 - 15 m3	2 No’s
16 – 30 m3	3 No’s
31 – 50 m3	4 No’s
Above 50 m3	4 + 1 No’s of addition of each 50 m3