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Question 
Laboratory experiments conducted in Mumbai on a particular 
mix showed a
strength of 33 MP a for a fully matured concrete. Find 
whether formworm
can be removed for an identical concrete placed at Jammu at 
the age of 15
days when the average temperature is 60C. The stripping 
stress in concrete
 Question Submitted By :: Manohar Cherala
I also faced this Question!!     Rank Answer Posted By  
 
  Re: Laboratory experiments conducted in Mumbai on a particular mix showed a strength of 33 MP a for a fully matured concrete. Find whether formworm can be removed for an identical concrete placed at Jammu at the age of 15 days when the average temperature is 60C. The stripping stress in concrete
Answer
# 1		 First thing the question is not completely and correctely
typed. The stripping stress in concrete in missing and also
how 60 deg temp will be possible in Jammu & Kashmir.
Let us connsider the Stripping stress of concrete as 25 Mpa
and average temp is 6 deg.

Now,

Maturity = Submission (time x temp)
= 15 x 24 x [6 - (11)]
= 6120 deg CH

Plowman's Constant given as A = 21 and B = 61


Se/S 15 = A + B Log10 [ M /1000]

Percentage of strength = 21 + 61 log(6120/1000)
= 68.99

The strength of Concrete at 15 days = 33 x (68.99/100)

= 22.76 Mpa

Since the strength of concrete is less than the stress


 
Is This Answer Correct ?    0 Yes 0 No
Buntychandwani
[HCC]
 
  Re: Laboratory experiments conducted in Mumbai on a particular mix showed a strength of 33 MP a for a fully matured concrete. Find whether formworm can be removed for an identical concrete placed at Jammu at the age of 15 days when the average temperature is 60C. The stripping stress in concrete
Answer
# 2		 First thing the question is not completely and correctely
typed. The stripping stress in concrete in missing and also
how 60 deg temp will be possible in Jammu & Kashmir.
Let us connsider the Stripping stress of concrete as 25 Mpa
and average temp is 6 deg.

Now,

Maturity = Submission (time x temp)
= 15 x 24 x [6 - (11)]
= 6120 deg CH

Plowman's Constant given as A = 21 and B = 61


Se/S 15 = A + B Log10 [ M /1000]

Percentage of strength = 21 + 61 log(6120/1000)
= 68.99

The strength of Concrete at 15 days = 33 x (68.99/100)

= 22.76 Mpa

Since the strength of concrete is less than the stress to
which it is likely to be subjectd while stripping the
formwork, the concrete may fail. Therefore, the formwork
cannot be removed at 15 days time. 
Is This Answer Correct ?    0 Yes 1 No
Buntychandwani
[HCC]
 
 
 

 
 
 
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