1- Lapping is not allowed for the bars having diameters more than 36 mm.
2- Chair spacing maximum spacing is 1.00 m (or) 1 No per 1m2.
3- For dowels rod minimum of 12 mm diameter should be used.
4- Chairs a minimum of 12 mm diameter bars to be used.
5- Longitudinal reinforcement not less than 0.8% and more than 6% of gross C/S.
6- Minimum bars for the square column are 4 No’s and 6 No’s for the circular column.
7- 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.
8- Minimum thickness of the slab is 125 mm.
9- Dimension tolerance for cubes + 2 mm.
10- Free fall of concrete is allowed a maximum of 1.50m.
11- Lap slices not be used for bars larger than 36 mm.
12- Water absorption of bricks should not be more than 15 %.
13- The PH value of the water should not be less than 6.
14- Compressive strength of Bricks is 3.5 N / mm2.
15- In steel reinforcement binding wire required is 8 kg per MT.
16- In soil filling as per IS code, 3 samples should be taken for the core cutting test for every 100m2.
17- The PH value of the water should not be under 6.
18- Electrical conduits shall not run in the column.
Cement shall be tested for its setting
1. The initial setting time shall not be less than 30 minutes.
2. The final setting time shall not be more than 10 hours.
Slump IS 456
Lightly reinforced 25 – 75 mm
Heavily reinforced 75 – 100 mm
Trench fill (insitu & Tremie) 100 – 150 mm (For Tremie no need of vibrator)
Curing Days Required
Super Sulphate cement: 7 days
Ordinary Portland cement OPC: 10 days
Minerals and Admixture added cement: 14 days
Densities of Different Types of Construction Materials
Steel = 7850 kg/Cum
Cement = 1440 kg/Cum
Brick = 1682 kg/Cum or 1920 kg/cum
Sand = 1100 to 1600 kg/cum
Water = 1000 kg/cum
R.C.C = 2500 kg/cum (5% of steel)
P.C.C = 2400 kg/cum
Wood = 1100 kg/cum
Crushed Brick = 950-1250 kg/cum
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