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 covering can be taken in the beam,column & slab also stair-case?

6 Answers  

what is dead wall?

2 Answers   RR,

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1 Answers  

how to calculate required shuttering material like props,spans,plates ..etc for a slab?

1 Answers   NCC, Shoba Devlopers,

how many bricks in 1 one cubic meter?

4 Answers   L&T,

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what is thickness of NP2 hume pipe?

3 Answers  

how to find out compressive strength of concrete

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how much should we assume for the weight of foundation ??

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