Answer / c. mak

Increased exposure to carbon dioxide from the air reduces
the pH of the concrete mix through carbonation. The reduced
pH causes the steel to corrode. May also be a result of
increased use of salts during the winter season.

Answer / koushik

in olden days the sections were huge and cover to the
reinforcement was much high......but now sections becoming
tooo slender and min cover is being provided.so this may b
one of the reason for the early deterioration of steel.

Answer / rajesh ghyar, global group

The reasons are as follows
1)Sub standard quality of reinforcement steel , Rerolling
material.Untested steel are using.
2) Poor workmen ship to provide reinforcement in proper
position.
3)No specified cover to steel.
4) Improper casting of RCC member.
5) Pollution in atmosphere.
6)Lack of supervision.

Answer / pordeep

nowadays usage of bribery,corrupption is more in indian
contarctors,politicians like kapil sibal,yeddurappa,reddy
chaddi,chidambaram,sonia gandhi,lalu gadkari,is more so les
quality cement stel is coming

what u guys say... cheers bhago bharat bhago

Answer / naveen

Ca (oH)2 is a by product of cement hydration product .if we contains less amount of calcium hydroxide (basic nature) decreases ultimately acidic nature increases 7-6-5------3-2-1 u know that 1 means have higher acidic nature .so 7 to 1 values increases acidic nature also increases then more acidic vices corrosion...kk

Answer / varun joshi

hi guys it is true that in olden days reinforment bars are
provided but there life span is increases because the ph
value of the constrution water is litil higher that time
its simple thying that we know nowdays h2so4 in atmosphere
is rised due to both reasons now days we providing reainfo
but it not give the strenght for the longer
period.....................

Answer / venky

my dear friends der was no usuage of steel in olden
days ... dan from wer question arises of rusting

Answer / prashant

the reason is that 2 much of water is used in mixing of
concrete so tht for better workmenship!!!so more moisture
conent!!!!nd the other reason may be the chemical used in
cement@

Answer / nisha a.s

One of the main reason is the corrosive environment.
Inadequate cover to the reinforcement also leads to
corrosion.

Answer / ishak

due to admixures used(nowadays) to improve the strength or
other property make the bars rusted

how many binding wire can be required for 1 metric tonne steel?

19 Answers  

what is the different between np2& np3 rcc hume pipe

1 Answers  

what is the calculation of raw material for 0.35cum of m-15

0 Answers   L&T,

what is conrete grade ,how are depent on concrete grad and size of concrete?

0 Answers  

rasio for outer plaster thickness for wall

7 Answers   L&T,

What is the strongest bridge for a school contest?

0 Answers  

As in practice, we are deducting every 2d for 90 degree bend but from where it comes means derivation or reference of IS Code.

0 Answers   Finance,

8mm.2l@7" c/c in footing column drawing,mean of 2l,4l in the Column drawing please answer give with example,thankyou,

2 Answers   L&T,

What is the origin of name railway sleepers?

0 Answers  

what is high type road and low type roads

0 Answers  

what pressure the NP2 class RCC pipe can sustain?

0 Answers  

what is the venturi effect in buildings? what is green house concept?different types of dams? which dam is economical arch dam or gravity dam. what are the conditions favourible to both of them?

0 Answers