CEMENTE AGING EFFECT
Cement aging effect:
Up to before the
twentieth century the concrete has been made from the normal materials that we
know the cement, sand and aggregates. After that in 20th century the
scenario has been changed with the invention of advanced mixing materials in cement
called as admixtures by this we can say that the 20th century is
stood as the witness for the innovation of concrete admixtures. As we all known
that cement is the binding material which is having the cohesive and adhesive
properties which helps to bond with the surrounding materials and can be
controlled chemically.
Now we have all
the techniques to modify the concrete properties according to the requirement
but in what time of storage? The Same question was raised in the minds of “ Lovely
K M, Anniamma Chacko” who are being
working in M A College of Engineering, Kothamangalam, Kerala, India this question
was made them to find the issue on the CEMENT AGING and finally published the
journal on this. By taking the reference of the particular journal I’m bringing
it to you.
The
Indian Standards for cement specifies that cement stored for more than 90 days
should be used only after ascertaining its strength characteristics as per IS
4031. And according to the civil engineers hand book the % reduction in
strength as fallows.
REDUCTION IN COMPRESSIVE STRENGTH DUE TO AGING
(It is According to the hand book of civil engineers.)
Sl.no
|
Period
|
Reduction in strength
|
1
|
3 months
|
20%
|
2
|
6 months
|
30%
|
3
|
12 months
|
40%
|
4
|
24 months
|
50%
|
By taking the above
as reference they have made the experiments by conducting the compressive strength
test for 3, 7, and 28 days by keeping the some cement bags in outside and some
in the air tight containers and for different aging periods.
By doing the
systematic study in cement aging the fallowing conclusion was made
“If cement is stored in air tight
condition, it gives the expected strength up to 3 months. For rich mix, the reduction
in strength is much less.”
SO WE HAVE TO USE THE CEMENT BEFORE THREE MONTHS IN AIR
TIGHT CONTAINERS OTHER WISE WE HAVE TO USE THE RICH MIX FOR THE REQUORED
STRENGTH.
To know the results of the above experiments u can refer the journal.
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