# Points to Remember for Civil Site Engineer

|## **Points to Remember for Civil Site Engineer**

Few general points for the civil engineer to remember to make the construction work easy and hence maintaining the quality of the work, done on the site:

- 36mm is the maximum diameter of the bars used for lapping. Bars having more than this diameter are not allowed.
- Maximum chair spacing is 1m and the minimum diameter used for these bars is 12mm.
- Minimum diameter used for dowels bars is 12mm.
- Longitudinal reinforcement should not be less than 0.8% of gross area of cross section and not be more than 6% of the same.
- Minimum number of bars used for square columns is 4 and that of a circle is 6.
- The main bars used in the slabs should not be less than 8mm when HYSD bars are used and 10mm when plain bars are used.

- The distribution bars in slabs should not less than 8mm and not more than 1/8 of slab thickness.
- Minimum thickness of slab is 125mm.
- Maximum free fall of concrete is allowed to 1.50m.
- Lap slices not be employed for bars greater than 36 mm.
- PH value of the water should not be less than 6.
- Compressive strength of Bricks is 3.5 N/mm
^{2} - Water absorption of bricks should not be more than 15 %.
- Binding wire required in steel reinforcement is 8 kg per MT.
- As per IS code, 3 samples should be taken for core cutting test for every 100m
^{2}in soil filling

- Bricks : 1600-1920kg/m
^{3} - Concrete block : 1920kg/m
^{3} - Reinforced concrete : 2310-2700kg/m
^{3}

** ****De-Shuttering time of different RCC Members**

- For columns : 16-24 hrs.
- Soffit formwork to slabs : 3days
- Soffit to beams props : 7days
- Beams spanning upto 4.5m : 7days

** ****Cube samples required for different quantity of concrete**

- 1-5m
^{3 }: 1 sample - 6-15m
^{3 }: 2samples - 16-30m
^{3 }: 3samples - 31-50m
^{3}: 4samples - Above 50 m
^{3 }: 4samples plus 1sample(addition of each 50m^{3})