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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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