Accuracy of measuring equipment in batching plant.
Cement : + – 2%
Aggregate : + – 3%
Admixture : + – 3%
Water : + – 3%
Mixing time : 2 minutes for one mixing. (Mixing which is being done on site)
Tolerance in Form work
In C/S for 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).
Tolerance in Reinforcement
For effective depth D < = 200mm = +- 10mm
For effective depth D > 200mm = +- 15mm
For Cover to reinforcement = + 10mm
Maximum freefall of concrete = 1.50 m height.
Tolerance on diameter 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
A) When the specified length is not given = + 75mm (or) – 25 mm
B) When the minimum length is specified = + 50 mm (or) – 0 mm
We are thankful to Er. Vikrant for submitting this to us.
If you have a query, you can ask a question here.
I would like to know whether these limits are applicable to Indian Construction works or others.
As per IS 4925-2003 tolerance limits for measurements in batching plants are:
Cementitious material & water + – 1%; agr + – 2%; Admixtures + – 3%.
I am thankful to this web site, because it is very helpful to the Civil Engineers. I expect more tolerance to be included in this page.
I d like to know what to do with unacceptable tolerance in concrete buildings
Thanks to grow knowledge about construction.
VERY KIND OF YOU…………….I LOVE CIVIL
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In SP 34-1987, Handbook on Reinforcement and Detailing, section 4,
Note : 4.1 – the cover shall in no case be reduced by more than 1/3rd of the specified cover or 5mm whichever is less.
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