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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.

100622-A-4015L-019

Density of Materials

Material Density
Bricks 1600 – 1920 kg/m3
Concrete block 1920 kg/ m3
Reinforced concrete 2310 – 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 Member De-shuttering time
For columns, walls, vertical form works 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 upto 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 required for different quantity of concrete

Quantity of Concrete No. of cubes required
1 – 5 m3 1 No’s
6 0 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

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Gopal Mishra

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68 Comments

  1. can supporting probes of slabs for multistory building be allowed to open or remove support after 7 days of casting, as ready mix concrete achieved design strength by cylinder test of 7 days ? as ready mix concrete same slab, test result shows after 28 days was much higher than designed ultimate strength, does it mean that reinforcement steel of the structure may be reduced?

  2. Bon makes the Bull Float that is shown in the photo. Follow us on FB and the web

  3. This is a helpful information; but I have to remind that most of these minimum or maximum dimensions depend upon standards adhered to. This is to mean they are not fixed values as long as the reference standard is not quoted.

  4. We are producing Light weight polyconcrete for the building industries in Bangladesh. It is highly insulated and Light weight. The weight of the polyconcrete is 11 kg/cuft. It is also very good for raise the floor.

  5. In the name of Allah…………… engineering schools format , Column of phone # is not ok I want to write +923466188404 but it is not possible

  6. /For dowels rod minimum of 12 mm diameter should be used/.Anybody Plz give reference for this

  7. Depends on different factors. 1. Type of soil, if very clayey, needs a layer of soling (sand or aggregate) before the foundation. 2. Type of building – if it is residential, a minimum depth of 600 (better 750mm) is advisable taking into consideration of the first point.

  8. soil filling is more dependent on the depth rather than the area. We need to consolidate almost every 1-2 ft minimum. If the area is too large some baffle walls need to be created to constrain the movement. Nice article !

  9. Minimum thickness of slab is 87.5 mm (According to code). But minimum slab thickness should be checked for deflection. Otherwise any one can check it with ( perimeter/180).

  10. The 125mm min. thickness being referred must be for simply supported slab or one-way slab. And if ever the computation for shear, moment & deflection(serviceability) showed less than the value or 87.5mm for 2-way slab, the minimum thickness requirements governs.

  11. what is the difference between the BS CODE & EURO CODES. especially BS 8110 Part 1, 2 & 3?

  12. Can U Said that waht wold be the minimum depth of foundation of two store building?

  13. can these values be given in FPS system of units.

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