Important point for Civil Site Engineer

The civil engineer has to perform many activities at the construction site and there are certain works which are repetitive in nature. So, some tips and point which a civil engineer should remember for faster calculations as well as quick solutions to construction site problems.

Important for Civil Site Engineer :

Following are some important points to remember for civil site engineers to make the construction work easier while maintaining a quality of construction.

  • Lapping in reinforcement is not allowed for the bars having diameters more than 36 mm.
  • Steel Char maximum spacing is 1.00 m (or) 1 No per 1m2.
  • In steel dowels, rod minimum of 12 mm diameter should be used.
  • Steel Chairs minimum of 12 mm diameter bars to be used.
  • Longitudinal reinforcement should not less than 0.8% and more than 6% of gross C/S.
  • Minimum bars used for a square column is 4 No’s and 6 No’s for the circular column.
  • Main bars used 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.
  • The minimum thickness of the slab should be 125 mm.
  • Dimension tolerance for concrete cubes + 2 mm.
  • Freefall of concrete is allowed maximum to 1.50m height.
  • Lap slices shall not be used for bar larger than 36 mm.
  • Water absorption of bricks limited not more than 15 %.
  • PH value of the water used should not be less than 6.
  • The minimum Compressive strength of Bricks is 3.5 N / mm2.
  • Binding wire required in steel reinforcement is 8 kg per Metric tonne.
  • For soil filling work as per IS code, 3 samples should be taken for core cutting test for every 100m2.

Density of Materials

Bricks – 1600 – 1920 kg/m3
Concrete block – 1920 kg/ m3

Reinforce Concrete – 2310 – 2700 kg/ m3

Curing Time for Concrete Members for various type of cement:

Curing of concrete

Super Sulphate cement: 7 days

Ordinary Portland cement OPC: 10 days

Minerals & Admixture added cement: 14 days

De-Shuttering period of different RCC Members

1)The period for columns, walls, vertical formworks – 16-24 hrs.

2) period for Soffit formwork to slabs – 3 days (props to be refixed after removal)

3) The period for Soffit to beams props – 7 days (props to refixed after removal)

4) Beams spanning up to 4.5m – 7 days

5) Beams spanning over 4.5m – 14 days

6) Arches spanning up to 6m – 14 days

7) Arches spanning over 6m – 21 days

Minimum Nos. Of Cube sample for given Volume of concrete:

Concrete cube

1 – 5 m3 = 1 Nos.
6 – 15 m3 = 2 Nos.
16 – 30 m3 = 3 Nos.
31 – 50 m3 = 4 Nos.

Above 50 m3 = 4 + 1 Nos.

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