Civil engineer does many activities at construction site and there are certain works which are repetitive in nature. So, some points, tips and tricks which a civil engineer should remember for faster calculations as well as quick solutions to construction site problems.
Points to Remember for Civil Site Engineer
Following are few general points to remember for civil site engineers to make the construction work easier while maintaining quality of construction.
Lapping is not allowed for the bars having diameters more than 36 mm.
Chair spacing maximum spacing is 1.00 m (or) 1 No per 1m2.
For dowels rod minimum of 12 mm diameter should be used.
Chairs minimum of 12 mm diameter bars to be used.
Longitudinal reinforcement not less than 0.8% and more than 6% of gross C/S.
Minimum bars for square column is 4 No’s and 6 No’s for 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 slab is 125 mm.
Dimension tolerance for cubes + 2 mm.
Free fall of concrete is allowed maximum to 1.50m.
Lap slices not be used for bar 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.
Compressive strength of Bricks is 3.5 N / mm2.
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.
Density of Materials
MaterialDensityBricks1600 – 1920 kg/m3Concrete block1920 kg/ m3Reinforced concrete2310 – 2700 kg/ m3
Curing time of RCC Members for different types of cement
Super Sulphate cement: 7 days Ordinary Portland cement OPC: 10 days Minerals & Admixture added cement: 14 days
De-Shuttering time of different RCC Members
RCC MemberDe-shuttering timeFor columns, walls, vertical form works16-24 hrs.Soffit formwork to slabs3 days (props to be refixed after removal)Soffit to beams props7 days (props to refixed after removal)Beams spanning upto 4.5m7 daysBeams spanning over 4.5m14 daysArches spanning up to 6m14 daysArches spanning over 6m21 days
Cube samples required for different quantity of concrete
Quantity of ConcreteNo. of cubes required1 – 5 m31 No’s6 0 15 m32 No’s16 – 30 m33 No’s31 – 50 m34 No’sAbove 50 m34 + 1 No’s of addition of each 50 m3
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