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.
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
