Tolerance in shuttering & reinforcement steel works
in construction due to various reason the tolerance limit is provided in various codes and the same is specified in tenders too. here below i am listing of the tolerance limit in shuttering as well as reinforcement along with general note for your reference
Form work:-
columns & Beams deviation is = +12mm more (or) - 6mm less in size
In footing plan= + 50 mm more (or) – 12 mm less size,
In depth= + 0.05 D (specified thickness).
Reinforcement:-
For effective depth D < 200mm = + 10mm
For effective depth D > 200mm = + 15mm
For Cover to reinforcement = + 10mm
Maximum free fall of concrete = 1.50 m height.
TOLERANCE ON DIA IN LENGTH:-
0-25mm = + 0.5 %
25-35mm = + 0.6 %
35-50mm = + 0.8 %
TOLERANCE ON WEIGHT PER METRE:-
0-10mm = +7%
10-16mm = + 5%
16 and above = + 3%
TOLERANCE FOR CUTTING LENGTH :-
When the specified length is not given= + 75mm (or) – 25 mm
When the min. length is specified= + 50 mm (or) – 0 mm
GENERAL:-
in construction due to various reason the tolerance limit is provided in various codes and the same is specified in tenders too. here below i am listing of the tolerance limit in shuttering as well as reinforcement along with general note for your reference
Form work:-
columns & Beams deviation is = +12mm more (or) - 6mm less in size
In footing plan= + 50 mm more (or) – 12 mm less size,
In depth= + 0.05 D (specified thickness).
Reinforcement:-
For effective depth D < 200mm = + 10mm
For effective depth D > 200mm = + 15mm
For Cover to reinforcement = + 10mm
Maximum free fall of concrete = 1.50 m height.
TOLERANCE ON DIA IN LENGTH:-
0-25mm = + 0.5 %
25-35mm = + 0.6 %
35-50mm = + 0.8 %
TOLERANCE ON WEIGHT PER METRE:-
0-10mm = +7%
10-16mm = + 5%
16 and above = + 3%
TOLERANCE FOR CUTTING LENGTH :-
When the specified length is not given= + 75mm (or) – 25 mm
When the min. length is specified= + 50 mm (or) – 0 mm
GENERAL:-
- 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 1 Sq.m
- For dowels rod minimum of 12 mm dia should be used.
- Chairs minimum of 12 mm dia 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 not 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 10 kg per MT
- In soil filling as per IS code 100 sqm should take 3 sample for core cutting test
