Useful Information For Civil Site Engineers


Useful Civil Engineering Tips For Site Engineers:

Following are the basic civil engineering tips you should be remembered while working on a construction site.

1. Grade Of Concrete:

M5 – 1 : 4 : 8

M10 – 1 : 3 : 6

M15 – 1 : 2 : 4

M20 – 1 : 1.5 : 3

M25 – 1 : 1 : 2


2. Clear Cover To Main Reinforcement:

Footings: 50 mm

Raft Foundation (Top) : 50 mm

Raft Foundation (Bottom): 75 mm

Raft Foundation (Side) : 75 mm

Beam: 25 mm

Strap Beam: 50 mm

Column :40 mm

Slab: 15 mm

flat Slab: 20 mm

Staircase: 15 mm

Retaining Wall: 20 – 25 mm

Water Retaining Structures: 2 0- 30 mm.


Maximum water absorption by bricks – 15%

Compressive strength of bricks – 3.5 N/mm2

Density Of Bricks- 1600-1920 Kg/m3

Minimum thickness of slab – 125 mm

Dimension tolerance for cubes – +2

Maximum free fall of concrete – 1.50 m

Lapping should not be used for the bars having larger dia than 36 mm.

Binding wire required for steel reinforcement – 8 kg per MT

3 samples should be taken for every 100 m2 in core cutting test.

Maximum chair spacing – 1 m.

Minimum dia should be used in dowels rod – 12 mm.

Hook for strriups (one side) – 9D

No. of strriups = (clear span/spanning) + 1

Length of main steel in cantilever anchorage – 69D.

Minimum no. of bars in square column – 4

Minimum no. of bars in circular column – 6

Minimum dia of main bars and distributors in the slab – 8 mm.

Maximum dia of main bars and distributors in the slab – 1/8 of slab thickness.

All reinforcement should be free from mill scales, loose rust, and coats of paints, oil or any other substances.


3. Setting Time:

Initial setting time should not be less than 30 minutes.

Final setting time should not be greater than 10 hours.

4. Required Curing Days:

Super sulfate cement – 7 days

Ordinary portland cement – 10 days

Cement with minerals and admixtures – 14 days.

5. Slump Value (IS-456):

Lightly reinforced concrete: 25 – 75 mm.

Heavily reinforced concrete: 75 – 100 mm.

Trench fill : 100 – 150 mm ( for in-situ & tremie).

6. Cube Samples:

1 – 5 m3 : 1 No.

6 – 15 m3 : 2 No..

16 – 30 m3 :3 No.

31 -50 m3 : 4 No.

Above 50 m3 : 4 + 1 no. of addition for each 50 m3.


Tags: Civil Engineering Tips, Civil Engineering information.

Also Read: Top 10 Requirements To Be A Successful Civil Engineer

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55 thoughts on “Useful Information For Civil Site Engineers”

  1. Sir,
    Dimension tolerance for cubes is – +0.2mm as per IS standard.
    CUBE SAMPLES:
    1 – 5 m3 : 1 Set (6nos 3 for 7days and 3 for days)
    6 – 15 m3 : 2 Set
    16 – 30 m3 :3 Set
    31 -50 m3 : 4 Set
    Above 50 m3 : 4 + 1 Set of addition for each 50 m3

    Reply
  2. thanks for your great guidance. this site is really very helpful for civil engineers. I’ve got you book marked to check out new stuff you post…thank you.

    Reply
  3. Hi, Really awesome and powerful points covered will back for read.
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    Reply

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